Neivamyrmex andrei

Usually collected in forests, often in mesic sites. Males, the only known caste, were collected from late June to August.

Identification
In the United States: N. andrei may be separated from all other known United States species, except Neivamyrmex swainsonii, by the broad front coxae (in all our other species, they are distinctly longer than broad). We believe that Neivamyrmex agilis will prove to be the female castes of this species.

Distribution
United States: AZ and NM. Mexico: Chihuahua.

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

Castes
Only known from the male caste.

Nomenclature

 *  andrei. Eciton andrei Emery, 1901d: 53, fig. 6 (m.) MEXICO. Combination in Neivamyrmex: Borgmeier, 1953: 19. Senior synonym of oslari: Borgmeier, 1953: 19. See also: Borgmeier, 1955: 451.
 * oslari. Eciton (Acamatus) oslari Wheeler, W.M. 1908e: 415, pl. 26, fig. 8 (m.) U.S.A. Combination in E. (Neivamyrmex): Smith, M.R. 1942c: 579. Junior synonym of andrei: Borgmeier, 1953: 19.

Male
Smith (1942), for the synonym oslari - Length 10-11 mm.

Head approximately one and seven-tenths times as broad as long. Eye very large, convex, protuberant. Ocelli large, placed on protuberance well elevated above general surface of head, summit of protuberance concave; lateral ocellus less than its greatest diameter from inner margin of eye. Frontal carinae well developed, rather sharply edged, with a distinct groove between them extending to anterior ocellus. Antennal scape not much wider than base of funiculus, approximately as long as combined length of first 3 funicular segments; funiculus very long, subfiliform, of almost same width throughout; all segments except first distinctly longer than broad. A rather pronounced ridge above each antennal socket. Posterior corner of head not angularly protuberant between lateral ocellus and inner border of eye. Mandible moderately long, sickle shaped, more or less gradually curved and tapering toward the pointed apex. Head, from above, distinctly projecting behind eyes. Eye, in profile, large but not occupying all of side of head, there being a rather large area posterodorsad. Region of head back of ocelli, in profile, flattened or slightly convex; occipital flange lacking. Thorax slender. Prothorax, in profile, with strong, transverse impression; slightly projecting above head. Mesonotum with anteromedian and parapsidal lines. Epinotum, in profile, concave or subtruncate, its base approximately one-half length of declivity. Legs small, especially anterior pair; metatarsus of middle leg approximately one-half length of tibia; tarsal claws usually toothed, but weakly so. Petiole one and two-thirds times as broad as long. Gaster slender. Base of seventh gastric sternum with a thick, blunt, somewhat emarginate, transverse ridge; apex of sternum with 3 teeth, the 2 lateral teeth acute, the intermediate tooth short and blunt, most clearly seen in profile. Paramere, in profile, strongly bifurcate at apex, the upper branch forming an elongated, curved, fingerlike process, and the lower branch a structure that resembles the mold board of a plow.

All parts of body and appendages shining in some lights except funiculi.

Dorsal surface of head especially shining. Head and mandibles with small, scattered punctures; thorax covered with numerous but rather fine punctures, those on side of thorax and posterior part of mesonotum largest, most distinct.

Hairs yellowish gray, short, appressed; rather dense on all parts of body; longer and more sub erect on head, legs, mesopleura, and venter. Seventh gastric sternum with an unusually dense and rather long group of hairs.

Reddish brown, with upper surfaces of head and thorax usually darker. On some specimens mesonotum with 3 dark, longitudinal fasciae. Wings grayish, with brownish-black veins and stigma.

Type Material
Smith (1942) –  Eciton oslari Nogales, Arizona, July 15, 1908, E. J. Oslar. Holotype in American Museum of Natural History.

References based on Global Ant Biodiversity Informatics

 * Borgmeier T. 1955. Die Wanderameisen der neotropischen Region. Studia Entomologica 3: 1-720.
 * Cover S. P., and R. A. Johnson. 20011. Checklist of Arizona Ants. Downloaded on January 7th at http://www.asu.edu/clas/sirgtools/AZants-2011%20updatev2.pdf
 * Dattilo W. et al. 2019. MEXICO ANTS: incidence and abundance along the Nearctic-Neotropical interface. Ecology https://doi.org/10.1002/ecy.2944
 * Fernandes, P.R. XXXX. Los hormigas del suelo en Mexico: Diversidad, distribucion e importancia (Hymenoptera: Formicidae).
 * Johnson R. Personnal Database. Accessed on February 5th 2014 at http://www.asu.edu/clas/sirgtools/resources.htm
 * Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).
 * Mackay W. P., and E. E. Mackay. 2002. The ants of New Mexico (Hymenoptera: Formicidae). Lewiston, New York: Edwin Mellen Press, 400 pp.
 * Mackay, W.P. and E. Mackay. XXXX. The Ants of New Mexico
 * Vasquez-Bolanos M. 2011. Checklist of the ants (Hymenoptera: Formicidae) from Mexico. Dugesiana 18(1): 95-133.
 * Vásquez-Bolaños M. 2011. Lista de especies de hormigas (Hymenoptera: Formicidae) para México. Dugesiana 18: 95-133
 * Watkins II, J.F. 1982.The army ants of Mexico (Hymenoptera: Formicidae: Ecitoninae). Journal of the Kansas Entomological Society 55(2): 197-247.