jiineigoo.] Casey : On Nukth Amk.rican Colkopt£ra. IGl! 



'rKiNoniNi. 

 Tin's tribe includes at present l)ut two very anomalous minute 

 species, differing radically in sternal structure hut perfectly homo- 

 logous otherwise, and inhabiting the paUi^arctic and nearctic regions 

 respectively. They represent two distinct genera as follows : — 



AiilLTior cox e iianowly se[)aratcJ, the process feebly caiiiKite, free and received at 

 tip witliin a deep anterior excavation in the broad mesosteniuni ; tarsi sliorter, 

 the lirst joint of the posterior but little longer than the second. Europe 



*Trinodes 



Anterior coxx more widely separated, the interco<al [jrocessilat, non-carinate and ex- 

 tending beneath the anterior margin of the still bro.ider mesosternum, which is 

 free, arcuate and feebly deflexed ; prosternura more dellexed at apex, the tarsi 

 longer with the basal joint more elongate. Eastern America Apsectus 



In both these genera the hypomera are flat, becoming broadly, 

 feebly impressed posteriorly, the antenn;x3 long, with very sleiider 

 shaft, received in repose within a narrow groove beneath the eyes, ex- 

 tending posteriorly for a short distance along the suture separating 

 the prosternum from its hypomera, the club 3-jointed, with the two 

 basal joints small, the third large and oblong-oval. The legs are slender 

 and free, the posterior retractile, the hind coxal plate very short, but 

 little longer internally and extending only to the wide parapleurse, 

 which are in a single piece. 



Apsectus Lcc. 



The single species seems to be rare, though rather widely dis- 

 tributed ; its general characters are as follows : — 



Oval, convex, piceous-black, polished, sparsely clothed with long erect and bristling 

 fulvo-piceous hairs, each of which completely fills at base a very minute punc- 

 tule, which, consequently, only become distinctly visible on the removal of the 

 bristles ; prothorax transverse, closely fitted to the elytra and lobed as usual at 

 base, the lateral edges entirely devoid of acute margin anteriorly but with an 

 acute and narrowly reflexed margin in basa? two-thirds, the surface with a fine 

 deep groove in outer third, closely paralleling the basal margin ; scutellum 

 large, flat, equilatero-triangular ; elytra wider than the prothorax and more than 

 three times as long, evenly and conjointly rounded behind ; under surface 

 .sparsely and very minutely punctulate, the pubescence shorter ; legs and antenna; 

 testaceous throughout, the large terminal joint of the latter blackish. Length 

 1.5 mm.; width 0.9 mm. Texas (Austin) hispidus Mehh. 



The ocellus is unusually small and feeble in Apsectus but is much 

 more distinct in Tri nodes. I have seen specimens, either of hispidus 

 or a species closely allied, collected by Mr. Schwarz in Arizona, but 

 probably in the higher regions. 



