212 MEMOIRS ON THE COLEOPTERA 



evenly and very feebly arcuate, the basal angles obtuse but sharp, not 

 at all blunt or rounded as they are in Thectiirota, the median line wholly 

 unimpressed also unlike that genus; elytra nearly as long as wide, with 

 evidently diverging sides, only very slightly wider and about a fourth 

 longer than the prothorax, the apices unlike Thecturota being feebly 

 but evidently sinuate laterally; abdomen slightly narrower than the 

 elytra, perfectly parallel, with straight sides throughout, the fifth tergite 

 fully one-half longer than the fourth. Length i.i mm.; width 0.19 mm. 

 California (Pomona Mts., Los Angeles Co.), Fall. 



The basal joint of the antennae is relatively less developed than in 

 Thecturota, the outer joints more transverse and the last larger, 

 but otherwise they are as in that genus. As may be observed 

 above, however, there are many structural incongruities, the more 

 important relating to the eyes, base of the head, basal angles and 

 median line of the prothorax, apices of the elytra and form and struc- 

 ture of the abdomen. The single type is of undetermined sex. 



Amblopusa Csy. 



In this genus the eyes are minute or vestigial, and it, besides, 

 differs from other Phytosids in having the five basal abdominal 

 tergites impressed at base, the fifth very nearly as deeply as those 

 preceding it; in Bryobiota and Thinusa the fifth tergite is not im- 

 pressed and the eyes are well developed throughout. Bryobiota 

 has the middle tibiae densely bristling throughout with short stiff 

 equal hairs, while in Thinusa the middle tibiae are sparsely and 

 more finely pubescent, with the outer side bearing long stiff spinules 

 a wholly different structure, but identical with that of the Euro- 

 pean Actosus. Amblopusa brevipes Csy., the type of this genus, was 

 originally described from a single example taken at Fort Wrangel, 

 Alaska. Mr. Keen has since sent it in some number from Metla- 

 katla, British Columbia, and borealis, described from Queen Charlotte 

 Islands, has also been sent from Metlakatla. The following seems 

 to be another species: 



Amblopusa pallida n. sp.- Subparallel, only very feebly convex, slightly 

 shining, very pale brownish-flavate throughout every part of the body 

 and legs; minute sculpture strong, obscuring the punctures anteriorly, 

 the punctures rather close, those of the elytra more distinct but sparser 

 and extremely minute, of the abdomen numerous, fine, asperate on the 

 sixth tergite; pubescence pale, moderately long, stiff and suberect; head 

 large, slightly wider than the prothorax, a little longer than wide, evenly 

 oval, parallel and arcuate at the sides, the eyes extremely minute, an- 



