16 MEMOIRS ON THE COLEOPTERA. 



with the sides but very feebly arcuate, the suture very slightly longer 

 than the prothorax; abdomen slightly narrower than the elytra and 

 parallel basally, gradually moderately narrowing with feebly arcuate 

 sides posteriorly from about the middle, the margins very thick, the three 

 basal impressions deep but rather fine, the fifth tergite equal in length 

 to the fourth, the sixth (cf ) broadly and feebly sinuato-truncate medially, 

 with the edge wholly unmodified, the sixth ventral narrow, rounded at 

 tip, with the apex truncate. Length 1.85 mm.; width 0.6 mm. Oregon 

 (The Dalles), Wickham. 



In the male the head is broadly concave medially, the concavity 

 clothed with longer shaggy hair, a character wholly wanting in 

 the male of acerba and furnishing an example of the polarity theory 

 of sexual characters held by LeConte, the sexual characters at the 

 ventral apex being pronounced in acerba but very feeble in fim- 

 briata. It differs from acerba, besides, in the relative lengths of 

 the basal antennal joints, also in the still coarser short hairs of 

 the pronotum and especially of the elytra. 



Ischnoglossa Kr. 



The American species which are numerous, distributed from the 

 Atlantic to the Pacific, conform very nearly in general habitus 

 and structure with a European example before me labeled Isch- 

 noglossa (Dexiogya) corticina Er. It is included under Sticho- 

 glossa Fairm., in the recent European catalogue and it is therefore 

 possible that Stichoglossa may be the generic name that should be 

 employed for these American species; they are very moderately 

 convex, closely, asperately punctured, rather stout anteriorly 

 but with the abdomen abruptly narrow and relatively slender. 

 The following species are additional to angustiventris and asperata, 

 alluded to above under Thiasophila: 



Ischnoglossa abscissa n. sp. Moderately stout and convex, red- 

 brown throughout, the abdomen rather dusky except apically, the legs 

 and antennae wholly flavo-testaceous; puncture! small and close-set, 

 strongly asperate, more distinct on the elytra, fine but asperate on the 

 abdomen, where the ground sculpture is feebly imbricate; pubescence 

 pale, very short, decumbent; head much wider than long, evenly convex, 

 parallel, the eyes somewhat convex and at less than their own length 

 from the base; antennae rather short, strongly incrassate, the first three 

 joints about equal in length, the fourth distinctly wider than long, the 

 outer joints strongly obtrapezoidal, tenth fully one-half wider than long, 

 the last simple, without transverse suture and rather longer than the two 

 preceding; prothorax two-thirds wider than long and nearly three-fourths 



