173 



they are seen to be less than twice as long as the head; they 

 are also less conspicuously narrowed to the base than in 

 the figure; the head is of peculiar shape, but the figure 

 rather exaggerates the basal enlargement. In both sexes the 

 four front femora are moderately angulate, the hind ones 

 feebly so. The male differs from the female in having the 

 antennae slightly longer, the prothoracic hump slightly more 

 pronounced, the under-surface of abdomen incurved from 

 apex to base (instead of strongly and evenly convex) with 

 the pygidium encroaching upon it ; tlhe middle trochanters 

 have an acute spine, and the middle tibiae have a short pro- 

 duced spur at the inner apex. In my table it would be 

 associated with fortnumi, which is a much smaller and other- 

 wise very different species. 



Articerus nitidicollis, Raffr. 



Mr. F. E. Wilson has taken two females of this species 

 in Victoria (Lome) in October, in nests of E ctatomma metal- 

 lic u-m, and of a small black species of Iridomyrmex. 



A. fortnumi, Hope". Hab. — Parachilna, Mount Lofty 



Ranges. 

 A. dilaticornis, Westw. Hab. — Fern Tree Gully,. 



Coburg. 

 A. dentipes, Lea. Hab. — Parachilna. 

 A. irregularis, Lea. Hab. — Coburg. 



Now knowing duboulayi, foveicollis, and the male of 

 constrictiventris additions to my table (5) of males may be 

 given as follows : — 

 a. 



r. Pronotum highly polished nitidicollis 



rr. Pronotum subopaque constriciiventris 



dd. 



s. Eyes on widest portion of head fortnumi 



ss. Eyes on narrowest portion (excluding 



neck) of head foveicollis 



ff- .... 



t. Antennae gradually increasing in width 



from near base hamatipes 



tt. Apical half of antennae suddenly becom- 

 ing much thicker icilsoni 



gg. 

 ggg- 



Metasternum unarmed posteriorly, 

 u. Mesosternum with an acute projection 



between middle coxae mesostemalis 



uu. Mesosternum not so armed subcylindricomis 



B. 



v. Antennae no longer than head turnidus 



vv. Antennae as long as head and prothorax 



combined duboulayi 



(3) Ante', 1918, pp. 242, 243. 



