Key to Myopias workers

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Myopias

1

 * Mandible elongate; in full-face view lateral margin convex; prebasal tooth strongly produced medially, subtended by short masticatory margin blade which diverges medially relative to lateral margin, and followed by strong concavity (Fig 7A) . . . . . Myopias concava


 * Mandible elongate or short; in full-face view lateral margin convex or linear; prebasal tooth not strongly produced medially, subtended by short or long masticatory margin blade which may or may not be divergent relative to lateral margin, and not followed by strong concavity . . . . . 2

2
return to couplet #1
 * Masticatory mandibular margin with conspicuously produced basal angle followed by a distinct concavity; masticatory margin blade between basal angle and prebasal tooth subequal in length to mandibular inner margin (Fig 7B). Median clypeal lobe apical margin concave, apicolateral corners conspicuously dentate (7B) . . . . . 3


 * Masticatory mandibular margin usually without, but sometimes with conspicuously produced basal angle, if basal angle somewhat produced, then margin following linear to convex; masticatory margin blade between basal angle and prebasal tooth usually conspicuously shorter or longer than mandibular inner margin. Median clypeal lobe apical margin concave to convex, apicolateral corners rounded to angled . . . . . 7

3
return to couplet #2
 * Compound eye well-developed; maximum diameter longer than malar space length (Fig 7C) . . . . . 4


 * Compound eye reduced; maximum diameter shorter than malar space length (Fig 7D) . . . . . 5

4
return to couplet #3
 * Median clypeal lobe length subequal to width in full-face view (Fig 7E) . . . . . Myopias bidens


 * Median clypeal lobe length considerably less than width in full-face view (Fig 7F) . . . . . Myopias breviloba

5
return to couplet #3
 * Anterior mesonotal margin raised well above posterior margin in profile view; mesonotal dorsum forming angle with propodeal dorsum . . . . . Myopias castaneicola


 * Anterior mesonotal margin not or barely raised above posterior margin in profile view; mesonotal dorsum more-or-less continuous with propodeal dorsum, excluding metanotal impression . . . . . 6

6
return to couplet #5
 * Median clypeal lobe comparatively large; anterolateral denticles pronounced. Scapes not reaching posterior head margin in full-face view. Lateral head margins weakly convex (Fig 7G) . . . . . Myopias mayri


 * Median clypeal lobe comparatively small; anterolateral denticles weak. Scapes surpassing posterior head margin in full-face view. Lateral head margins strongly convex (Fig 7H) . . . . . Myopias trumani

7
return to couplet #2
 * Median clypeal lobe absent or strongly reduced and without distinct apicolateral corners . . . . . 8


 * Median clypeal lobe present, with or without distinct apicolateral corners . . . . . 10

8
return to couplet #7
 * Mandible length in full-face view about equal to half head width. Prebasal tooth extremely robust, larger than compound eye . . . . . Myopias amblyops


 * Mandible length in full-face view greater than half head width. Prebasal tooth not robust, smaller than compound eye . . . . . 9

9
return to couplet #8
 * Prebasal tooth recurved in full-face view. With head in profile view, basal half of masticatory margin strongly produced anterodorsally, forming spectacular lobe . . . . . Myopias lobosa


 * Prebasal tooth directed medially in full-face view. With head in profile view, basal half of masticatory margin not produced anterodorsally . . . . . Myopias cribriceps

10
return to couplet #7
 * Head, mesosoma, and metasoma nearly completely covered with fine sculpture, rendering cuticle somewhat opaque (Fig 8A) [note: a Bill Brown morphospecies, “blanadelphe”, keys here; distinguishing characters are uncertain] . . . . . 11


 * Head, mesosoma, and metasoma not covered with very dense fine sculpture; cuticle predominantly shining, even if sculpture present (Fig 8B) . . . . . 13

11
return to couplet #10
 * Petiolar sternum bidentate; subpetiolar process followed by second triangular process. Compound eyes absent . . . . . Myopias nops


 * Petiolar sternum unidentate; subpetiolar process not followed by second triangular process. Compound eyes represented by single pin-prick-like facets . . . . . 12

12
return to couplet #11
 * Posterior head margin angularly concave in full-face view. Lateral margins of median clypeal lobe parallel. Dorsal face of petiole convex in profile view . . . . . Myopias shivalikensis


 * Posterior head margin more-or-less linear in full-face view, but not angularly concave. Lateral margins of median clypeal lobe converging apically. Dorsal face of petiole linear in profile view . . . . . Myopias menba

13
return to couplet #10
 * Mandible somewhat (Fig 8C) to extremely elongate (Fig 8D) and linear in full-face view; lateral margin linear and parallel or slightly subparallel with medial margin for most of mandibular length; basal mandibular margin considerably shorter than inner mandibular margin; basal mandibular margin oriented more-or-less subparallel with chord length of mandible, thus basal mandibular blade narrow [note: a Bill Brown morphospecies, “pisinna”, keys here, and may be differentiated from subsequent species by the honey-yellow coloration, short scapes, and mandibular form] . . . . . 14


 * Mandible neither elongate nor linear in full-face view; lateral margin convex and not parallel with medial margin; basal mandibular margin well-developed, longer than inner mandibular margin; basal mandibular margin divergent from chord-length of mandible, thus basal mandibular blade broad . . . . . 31

14
return to couplet #13
 * Head smooth, with or without dilute weak punctae. Median clypeal lobe lateral margins parallel to weakly diverging apically . . . . . 15


 * Head with distinct, fine-to-coarse, conspicuous punctures or foveae, or head striate. Median clypeal lobe lateral margins parallel, converging apically or strongly diverging apically [note: a Bill Brown morphospecies, “epeirica”, keys here, and may be differentiated from the following species by presence of dense pubescence on the head, legs, and antennae] . . . . . 23

15
return to couplet #14
 * Median clypeal lobe about three times as long as broad [note: placed based on description in Emery (1900)] . . . . . Myopias xiphias


 * Median clypeal lobe at most twice as long as broad . . . . . 16

16
return to couplet #15
 * Frontal lobes expanded, maximum lateromedial width almost twice anteroposterior length of median clypeal process. Basal blade of mandibular masticatory margin from basal angle to base of prebasal tooth shorter than basal mandibular margin. Prebasal tooth robust, length slightly less than half width of basal blade. Subpetiolar process wedge-shaped, anteroposteriorly broad and dorsoventrally tall in profile view. Compound eyes reduced (~ 5 facets); antennal scapes robust and short, not reaching posterior head margin in full-face view . . . . . Myopias darioi


 * Frontal lobes not as expanded, maximum width less twice median clypeal lobe length, although may be about as broad as lobe. Basal blade of mandibular masticatory margin longer than basal mandibular margin. Prebasal tooth fine or robust, but considerably shorter than basal blade length. Subpetiolar process not as above: fine and subrectangular or somewhat broad and anteroventrally truncate, dorsoventrally short. Compound eyes reduced, represented by one to several facets, or eyes large ( > 7 facets); antennal scapes robust or slender, reaching posterior head margin or not . . . . . 17

17
return to couplet #16
 * Propodeum weakly to strongly convex in profile view; meeting mesonotum at distinct angle . . . . . 18


 * Propodeum sublinear in profile view; more-or-less continuous with mesonotum . . . . . 19

18
return to couplet #17
 * Compound eye composed of over 20 ommatidia. Basal blade of mandibular masticatory margin subequal to length of basal mandibular margin. Propodeal dorsum smoothly convex in profile view . . . . . Myopias latinoda


 * Compound eye composed of less than 20 ommatidia. Basal blade of mandibular masticatory margin considerably longer than basal mandibular margin. Propodeal dorsum unevenly convex in profile view . . . . . Myopias chapmani

19
return to couplet #17
 * Compound eyes small, with less than 10 ommatidia . . . . . 20


 * Compound eyes large, with over 10 ommatidia [note: placement here based on original descriptions in Crawley (1924) and Emery (1901); supposedly these two species may be distinguished by scape length, with M. crawleyi having scapes which barely fail to reach the posterior head margin and M. levigata having scapes which slightly exceed the posterior head margin] . . . . . Myopias crawleyi . . . Myopias levigata

20
return to couplet #19
 * Compound eye composed of ≥ 4 ommatidia . . . . . Myopias emeryi


 * Compound eye composed of ≤ 3 ommatidia [note: M. santschii Viehmeyer, 1914 keys here based on the original description, but cannot be confidently placed further] . . . . . 21

21
return to couplet #20
 * Scapes failing to reach to reaching posterior head margin when laid back in full-face view. Small; head width < 0.70 mm . . . . . Myopias tenuis


 * Scapes overreaching posterior head margin when laid back in full-face view. Larger; head width > 0.90 mm . . . . . 22

22
return to couplet #21
 * Prebasal tooth situated at about mandibular midlength. Head capsule nearly broad as long (HW/HL*100 = 99). Mandibles robust . . . . . Myopias media


 * Prebasal tooth situated at about distal third of mandible. Head capsule longer than broad (HW/HL*100 ~ 90). Mandibles thin . . . . . Myopias julivora

23
return to couplet #14
 * Median clypeal lobe lateral margins strongly divergent apically, meeting apical margin at pronounced angles (Fig 8E) . . . . . 24


 * Median clypeal lobe lateral margins parallel, convergent, or weakly divergent apically, meeting apical margin at rounded angles . . . . . 27

24
return to couplet #23
 * Abdominal terga III and IV smooth and shining . . . . . 25


 * Abdominal terga III and IV foveate . . . . . 26