MEMOIRS ON THE COLEOPTERA 



tained by European systematists. The three species mentioned, 

 instead of having the large flat depressions, have smaller and un- 

 depressed but more metallic spots in the same positions with regard 

 to the dorsal punctures, and the more regular striation and coarser 

 strial punctures of these species are more remindful of the coxendix 

 than the litorale section of the subgenus, where they have been 

 placed. 



The exposition of the remarkable structural characters of the 

 litorale section, recently given with clearness and general accuracy 

 by Mr. H. C. Fall (Tr. Am. Ent. Soc., 1910, p. 94), renders it un- 

 necessary to draw up a special table of the subgenus at the present 

 time, and the few new forms described below can without uncer- 

 tainty be interpolated in the tables of Fall and Hay ward. 



The two following species have a submedian lateral thoracic seta 

 and a long truncate mentum tooth, these characters being as in 

 laciistre Lee. 



Bembidion opaciceps n. sp. Body narrower and rather more convex 

 than in laciistre, black, the upper surface with dark cupreo-aeneous lustre; 

 legs black, the femora pale basally; antennae black, the basal joint pale 

 on its under surface, more than half as long as the body, the medial 

 joints more than three times as long as wide; head small, barely over 

 two-thirds as wide as the prothorax, opaque, the eyes very large as usual; 

 prothorax a third wider than long, throughout nearly as in laciistre; 

 elytra nearly two-thirds longer than wide, one-half wider than the pro- 

 thorax, gradually narrowed and not broadly rounded apically, the striae 

 fine and finely punctate, very irregular; surface shining, broadly dull 

 laterally and at tip, with a sublateral and more convex elongate polished 

 spot at two-thirds, between the sixth and seventh striae. Length 4.7 

 mm.; width 1.8 mm. California. Levette collection. 



Distinguishable from lacustre as stated above, and by its notably 

 smaller head, less abbreviated prothorax and more strongly arcuate 

 apex of the elytra, the striae of which are more irregular, being much 

 broken up in part. From litorale it differs in the elongate mentum 

 tooth, the latter in its more elongate developments in the present 

 group, being at the same time much more convex than in the abbre- 

 viated forms, such as litorale, the convexity extending through the 

 median parts of the mentum behind it. Mr. Fall correctly states 

 that in litorale the mentum tooth is short and truncate, but he de- 

 fines it as having no lateral thoracic seta; in my single example, 

 received many years ago from Desbrochers des Loges, there is a 



