Neivamyrmex fuscipennis

Collected in creosotebush scrub and desert riparian canyons with oaks, pines and junipers. The habits of this ant are unknown, except that males are attracted to lights. Flights occur from May to August.

Identification
Smith (1942) - The male of fuscipennis can be distinguished by its rather small size; slender form; long, curved, very acutely tapering mandible; strongly projecting posterior corner of the head; subfiliform antennal funiculus; faintly toothed tarsal claws; deeply infuscated wings; and yellowish-brown body with blackish head. This species might be confused with Neivamyrmex melshaemeri, to which it bears a resemblance in size, form, protuberant posterior corners of the head, and the shape of the mandibles. It can be very easily distinguished from melshaemeri, however, by its larger size, longer mandibles, deeply infuscated wings, and much shorter pilosity.

Distribution
United States: KS, TX (eastern), NM and AZ (Chiricahua Mts.). Mexico: Chihuahua, Durango, Oaxaca, Puebla.

Distribution based on Regional Taxon Lists
Nearctic Region: United States. Neotropical Region: Mexico.

Castes
Known only from the male caste.

Nomenclature

 *  fuscipennis. Eciton (Neivamyrmex) fuscipennis Smith, M.R. 1942c: 578, pl. 4, fig. 15 (m.) U.S.A. [Acamatus fuscipennis Wheeler, W.M. 1908e: 417. Nomen nudum, attributed to Cresson.] Combination in Neivamyrmex: Borgmeier, 1953: 18. Senior synonym of macropterus: Snelling, G.C. & Snelling, R.R., 2007: 469. See also: Borgmeier, 1955: 642; Watkins, 1975d: 85; Smith, D.R. 1979: 1330.
 * macropterus. Neivamyrmex macropterus Borgmeier, 1953: 40, figs. 14, 16 (m.) MEXICO. Junior synonym of fuscipennis: Snelling, G.C. & Snelling, R.R., 2007: 469. See also: Borgmeier, 1955: 645.

Snelling and Snelling (2007) - As Creighton (1950) had pointed out, the authorship of this species has been confused. Wheeler (1908) recorded two male specimens from an unspecified locality in Texas as Eciton (Acamatus) spoliator Forel, 1899, a species originally described from Costa Rica. He provided a translation of Forel's species and a figure that was clearly based on one of the Texas males. Wheeler further noted that the specimens bore an unpublished Cresson name, Acamatus fuscipennis. M. R. Smith (1942) correctly recognized that the Texas specimens were not the same as Forel's species and redescribed the two males as Eciton (Neivamyrmex) fuscipennis, attributing the species authorship to Wheeler (1908). Subsequent authors have followed Smith's lead in awarding authorship to Wheeler. D. R. Smith (1979), however, determined that the correct author for N. fuscipennis should be M. R. Smith, 1942. Watkins (1975) concurred and selected one of the Texas males as lectotype.

Male
Length 10 mm.

Head one and six-tenths to one and seven-tenths times as broad as long; posterior corners strongly protruding and easily visible between lateral ocellus and eye. Ocelli large, but not placed on high protuberance above general surface of head as in minus, summit of protuberance concave. Antennal scape approximately as long as the combined length of the first 3 funicular segments; funiculus of approximately same width throughout, except through segments 2 to 5 inclusive, where it is feebly broader; segments 3 to 12 distinctly longer than broad. Mandible remarkably long, slender, curved, tapering from base toward apex and ending in a very acute point. Frontal carinae rather far apart, with moderately shallow but broad groove between them. Eye rather large, convex, protuberant. In profile, eye occupying all of side of head except small area above base of mandible and a large ridgelike area posterodorsad of eye. In profile, region of head posterior to ocelli flattened or feebly concave, lacking occipital flange. From above, posterior corners projecting noticeably behind eyes. Space between ocellus and eye approximately equal to one-half or less 'greatest diameter of ocellus. In profile, thorax not noticeably protruding above head as in minus. Prothorax without distinct transverse impression anteriorly. In profile, thorax about three-fifths as high as long. Epinotum subtruncate, with vertical or feebly concave declivity. From above, thorax truncate anteriorly; mesonotum with distinct anteromedian and parapsidal lines. Legs rather small, slender. Petiole slightly broader than long, with rounded anterior angles, produced and distinct posterior angles, and very weakly concave sides; lacking the extremely sharp anterolateral margins of minus. Gaster slender, compressed, with distinct constrictions between segments. Apex of seventh gastric sternum with short median and two acute lateral teeth.

Punctures on head, and especially on thorax, abundant, coarse, distinct. Head and gaster apparently more shining than other parts of body although these are also shining in certain lights.

Hairs yellowish, dense, rather closely appressed on all parts of body except head, legs, ventral surfaces of body, and tip of gaster, where they are longer and more suberect to erect.

Light brown or yellowish brown, with darker head. Wings hairy, deeply and uniformly infuscated, bearing brown veins and stigma, stigma prominent.

The description is drawn from 17 specimens in the collection of the United States National Museum, all of which appear to belong to the same series, although 8 of this number bear the label "Texas, Belfrage," and the other 9 only the label "Texas." Two of the latter, however, have in addition handwritten label "Labidus fuscipennis Cr." One of the handwritten labels seems to be that of Belfrage. From the available information it appears that Labidus fuscipennis is a manuscript name assigned by Cresson to specimens collected by Belfrage.

Type Material
Two specimens in the National Museum collection are presumably the males described and figured by Wheeler. Texas, G. W. Belfrage.