Strumigenys umboceps

Known from two litter-sample collections from a ridgetop cloud forest.

Identification
Bolton (2000) - A member of the Strumigenys schulzi-group. A member of the microthrix-complex, umboceps is easily isolated by its high-domed head, presence of obviously spatulate clypeal pilosity, distinctive pilosity on the first gastral tergite, very small propodeal teeth and swollen postpetiole.

Distribution based on Regional Taxon Lists
Neotropical Region: Ecuador.

Nomenclature

 *  umboceps. Pyramica umboceps Bolton, 2000: 227 (w.) ECUADOR. Combination in Strumigenys: Baroni Urbani & De Andrade, 2007: 130

Worker
Holotype. TL 1.9, HL 0.50, HW 0.38, CI 76, ML 0.09, MI 18, SL 0.26, SI 68, PW 0.26, AL 0.50. Anterior clypeal margin broadly evenly convex. Clypeal dorsum with conspicuously spatulate curved hairs, those near the posterior margin the largest and most elevated. Cephalic dorsum with anteriorly curved suberect hairs behind highest point of vertex. Head in profile with vertex strongly raised into a high narrowly rounded tumulus: dorsal outline behind clypeus shallowly concave, then rising steeply at about the level of the eye; summit of tumulus behind level of eye and outline then forming a shallowly convex steep slope down to the occiput. Scrobe shallow, short and broad, its dorsal margin very weakly defined behind level of frontal lobes. Eye with 3 ommatidia in longest row. Dorsum of promesonotum not flattened. Femoral gland bullae elongate and conspicuous; bullae very obviously much longer than broad. Propodeal teeth extremely small. Both mesopleuron and metapleuron with extensive smooth areas. Petiole in dorsal view with node about as long as broad, in profile with a long stout peduncle and the node bluntly convex; postpetiole swollen and subglobular. Disc of postpetiole in dorsal view with a mostly smooth median patch. Dorsal alitrunk and waist segments with spatulate ground-pilosity that is curved and subreclinate. First gastral tergite smooth behind the short basigastral costulae, with numerous short fine hairs that are closely appressed and acute apically. Each hair arises from a very conspicuous pit and is directed posteromedially.

Type Material
Holotype worker, Ecuador: Prov. Pichincha, Tinalandia, 16 km. SE S. Domingo de los Colorados, 4.vi.1976 (S. & J. Peck).

References based on Global Ant Biodiversity Informatics

 * Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.
 * Longino J. T. L., and M. G. Branstetter. 2018. The truncated bell: an enigmatic but pervasive elevational diversity pattern in Middle American ants. Ecography 41: 1-12.
 * Longino J. et al. ADMAC project. Accessed on March 24th 2017 at https://sites.google.com/site/admacsite/