Cephalotes alfaroi

Identification
A member of the atratus clade characterised by the crenulate frontal carinae bearing clavate hairs (less so than in the sister species Cephalotes serraticeps), and differing from its sister species serraticeps by the longitudinally rugulose head and for the narrower and not laterally compressed first tarsomeres of the mid and hind legs.

All the alfaroi specimens we have seen (including the syntypes) differ from serraticeps by the minute longitudinal rugulation of the head and of the mesosoma (properly described by Kempf, 1951), by the less clavate hairs over the frontal carinae and by the shape of the tarsomeres of the fore, mid and hind legs, less compressed, narrower and longer than in serraticeps.

Distribution
Panama, Costa Rica

This taxon was described from Costa Rica.

Nomenclature

 *  alfaroi. Cryptocerus alfaroi Emery, 1890b: 76 (s.w.) COSTA RICA. [Also described as new by Emery, 1894k: 59.] Combination in Cephalotes: Emery, 1914c: 39. See also: Kempf, 1951: 112. Junior synonym of serraticeps: Kempf, 1963c: 437. Revived from synonymy: De Andrade & Baroni Urbani, 1999: 129.

Worker
Kempf (1951) - "Length 10.0 mm. Median head length 2.24 mm. Weber's length of thorax 3 . 1 7 mm. Similar to the major worker, from which it differs in the following features: Frontal carinae p artly semi-transparent, fuscous-ferruginous, converging in front, lateral border straight, preatly upturned. Each occipital angle with a pair of triangular spines, the anterior spine with a minute tooth arising from the base, projecting outward. Occiput continuous with vertex, not truncated, the pair of teeth on vertex obsolete. Integument subopaque, more sharply punctured and finely longitudinally rugulose caudad. Thorax subopaque, longitudinally areolate-rugose above and laterally. Scapular spines more slender, longer, acuminate, median teeth small, their bases transvese in the form of a crest. Spines of petiole more conspicuous. Sculpture of gaster sharper and coarser, distinctly longitudinally rugulose."

Measurements (in mm) and indices: TL 8.40-11.46; HL 1.80-2.48; HW 2.20-2.88; EL 0.44-0.56; PW 1.76-2.70; PeW 0.47.0.62; PpW 0.60-0.80; HBaL 1.72-2.12; HBaW 0.35-0.47; CI 116.1-122.2; PI 106.7-125.0; PPeI 374.5-435.5; PPpI 280.0-360.0; HBaI 20.3-22.2.

Soldier
Kempf (1951) - "Length 13 mm. Median head length 2.97 mm. Weber's length of thorax 4.15 mm. Black; the following dark ferruginous: tip of last funicular segment, apices of last tarsal segments, claws.

Head subfulgid, subquadrate, microscopically punctate, coarsely and sparsely foveolate. Mandibles reticulate-rugose, with a distinct apical and preapical tooth. Clypeur and frontal area vestigially set off. Frontal carinae crenulated, their sides moderately arcuate and slightly upturned. Vertex with a transversely located pair of blunt swellings. Occiput subtruncate mesad. Occipital angles with a rather large and obtuse posterior tooth, the anterior tooth scarcely distinct from the crenulated border of the frontal carinae. In lateral view three minute denticules project ventrad from the frontal carinae, in front of the eye. Eyes beneath the antennal scrobe. Maxillary palpi 5-segmented. A small but distinct tooth projecting from the sides of the head, somewhat above and behind the eyes. Scape incrassated distad, attenuate and subcylindrical proximad.

Thorax subopaque. Shoulders obtusely angulate. Dorsal face of pronotum inclined cephalad, with two stout, rather acute median spines and a lateral, stout, more or less apically truncate scapular spine on each side, above and behind the shoulder. A minute tooth projecting distad from the anterior side of the scapular spine. Promesonotal suture distinct. Mesonotum moderately inclined caudad, flat, marginate laterad, its posterior corners marked by somewhat raised, blunt swellings. Mesoepinotal suture distinctly impressed. Basal face of epinotum somewhat inclined cephalad; about as long as wide, its sides immarginate, subequal in length to the declivous face. Lower mesopleura with an anterior tooth. Epinotal spines longer than basal face, divergent, somewhat upturned, subacuminate. Integument microscopically and densely punctate, sparsely foveolate. Middle portion of femora moderately incrassate, the upper face strongly marginate on the distal end. Tibiae prismatic. Middle and hind basi tarsus compressed and greatly flattened.

Petiole subopaque; subquadrate from above, its sides subparallel. Anterior face obliquely truncate. Anterior corner of dorsal face with a laterally projecting minute tooth. Integument finely and densely punctate, and sparsely foveolate. Postpetiole wider than long, with a pair of conspicuous recurved teeth above, on the anterior border. Ventral face with a distinctly ventrally projecting lobe. Sculpture as on petiolc. Densely foveolate-rugose.

Gaster subfulgid. First tergite and firts sternite microscopically and very shallowly punctate, almost smooth, fulgid, except the narrow posterior margin, which, as also the exposed portion of the remaining tergites and sternites, are more sharply punctured and transversely rugulose.

Most of the foveolae contain a thin, short, decumbent seta. Margin of frontal carinae with a row of somewhat clubbed setae within the crenulations, along their entire length. Mandibles, lowe rsurface of head, spines of thorax, postpetiole appendages and gaster above and below, with sparse, erect setae."

Measurements (in mm) and indices: TL 12.62-13.02; HL 2.92-3.04; HW 3.52-3.60; EL 0.68; PW 3.20-3.32; PeW 0.74-0.84; PpW 0.87-0.92; HBaL 2.04-2.08; HBaW 0.52; CI 118.4-120.5; PI 106.0-112.5; PPeI 381.0-448.6; PPpI 347.8-381.6; HBaI 25.0-25.5.

Type Material
Worker and soldier. Type locality: Alajuela (Costa Rica). Type material: two workers labelled "Alajuela, Alfaro" in ; one worker and one soldier with syntype label only, in, examined.