Polyrhachis (Aulacomyrma) snellingi, Kohout, R. J., 2007

Kohout, R. J., 2007, Revision of the subgenus Aulacomyrma Emery of the genus Polyrhachis F. Smith, with descriptions of new species., Advances in ant systematics (Hymenoptera: Formicidae): Homage to E. O. Wilson - 50 years of contributions. (Memoirs of the American Entomological Institute 80), pp. 186-253 : 237-238

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Polyrhachis (Aulacomyrma) snellingi

new species

Polyrhachis (Aulacomyrma) snellingi   HNS , new species

Figures 101, 104, 107


HOLOTYPE: INDONESIA, IRIAN JAYA, PT. Freeport Concession , Siewa camp , 03.04 º S, 136.38 º E, 200 ft, 18 - 30. iv. 1998, lowland secondary rf., Malaise trap, R. R. Snelling # 16 (worker). Type distribution: unique holotype in LACM GoogleMaps .


Dimensions of holotype: TL c. 4.59; HL 1.15; HW 1.06; CI 92; SL 1.28; SI 121; PW 1.00; MTL 1.15.

Anterior clypeal margin with shallow notch medially; in profile clypeus virtually straight with only very weakly impressed basal margin. Frontal carinae sinuate with laminate lobes. Sides of head weakly convex, gently converging anteriorly, curving behind eyes into relatively shallow preoccipital margin. Eyes convex, in full face view clearly breaking lateral cephalic outline. Mesosomal dorsum only partially marginate. Pronotal humeri armed with very strong, anteriorly directed, broad-based spines, with raised margins, central areas distinctly concave; lateral margins of spines extended posteriorly for some distance, merging with outermost dorsal striae and curving onto sides, not reaching distinct promesonotal suture. Mesonotal dorsum marginate; propodeum poorly margined, outermost striae delimiting lateral edges of dorsum and terminating in downward and weakly inward curved angles. Propodeal dorsum descending into declivity in even, uninterrupted curve. Petiole with both faces convex, dorsal margin acute; lateral spines relatively short, acute, curved weakly backwards and upwards. First gastral segment with anterior face concave; dorsal margin of concavity sharp, not elevated above dorsal face of segment.

Mandibles finely, mostly longitudinally, striate. Head, including clypeus, distinctly striate; striae mostly longitudinal on front of head and vertex, somewhat oblique on sides. Dorsum of mesosoma distinctly longitudinally striate, striae converging anteriorly; dorsal surfaces of pronotal spines not striate, finely shagreened. Mesonotal-propodeal dorsum longitudinally striate, striae converging posteriorly towards declivity. Petiole with anterior face transversely striate; posterior face with fan-shaped striae running from apex of dorsal margin towards sides and base of segment. Anterior face of first gastral segment with transverse striae that are continued posteriorly along sides and towards dorsum; dorsal surface more finely, longitudinally, striate.

Numerous erect or semierect, yellowish or off-white hairs, shorter than greatest diameter of eye, present on most body surfaces. Mostly greyish or silvery, appressed or semierect pubescence present in various densities on most body surfaces, sparse on head, rather abundant on pronotal dorsum and mostly confined to interspaces between striae and pronotal spines. Propodeal dorsum with pubescence relatively long and distincly curved towards midline. Gastral dorsum with rather dense pubescence partly obscuring sculpture.

Black, mandibular masticatory border very narrowly and funiculi towards apices, very dark reddish-brown. Legs generally medium reddish-brown, apices of mid and hind femora, tibiae and first tarsal segments, very dark reddish-brown.

Sexuals and immature stages unknown.


Named in honor of its collector, Roy R. Snelling of the Natural History Museum of Los Angeles County.


P. snellingi   HNS is a very distinctive species. It is the only known member of the subgenus having the lateral striation of the first gastral segment extending transversely across its anterior face.


USA, California, Los Angeles, Los Angeles County Museum of Natural History