44 Memoirs on the Coleoptera 



concisus and more rapidly obtuse at apex, the sinus similar; striae 

 not quite so fine, smooth, not much coarser at apex; intervals flat; 

 two anterior punctures near the third, the third near the second, 

 stria, and similarly rather subapical in position, the met-episterna 

 similar; anterior male tarsi feebly dilated, the fourth joint similar. 

 Length (cf) 6.5 mm.; width 2.65 mm. Mexico (Federal District). 

 A single example from an unrecorded source. . . . *lyniphaticus n. sp. 



The very isolated species described by LeConte under the name 

 stygicus, was afterward suppressed and held to be a synonym of 

 maurus Mots., but incorrectly, as shown by a typical specimen 

 of maurus from near the type locality, which was said to be Cali- 

 fornia, and described above; the Alaskan representative sent to 

 LeConte as maurus was evidently something different. The very 

 obtuse and blunt basal thoracic angles of stygicus, as well as some 

 others, such as cincticollis and pennsylvanicus, lack the subprominent 

 sharp denticulation generally observable in Anchomenus, but the 

 apparently broadly rounded outline is caused to great extent by 

 the exceptionally arcuate and oblique sides of the base in those 

 species. 



The species described above as hoopis, though smaller, is undoubt- 

 edly allied to opaculus Lee, which is unknown to me at present, 

 for the elytra are somewhat duller than in any other here described 

 excepting inquisitor, which is also allied, although differing in the 

 very prominent rounded apical lobes of the elytra and exceptionally 

 deep subapical sinus, as well as in antennal structure ; hoopis seems 

 to differ from opaculus, said to be from Ohio, in its much longer 

 antennae, these being described as slightly longer than the head 

 and prothorax combined in opaculus, which however is probably 

 an understatement of the fact. 



There can be scarcely a doubt that hicoloratus is a species distinct 

 from hrunneomarginatus; it is more southern and essentially 

 Sonoran in range. The synonyms under hrunneomarginatus, given 

 above, are simply quoted from LeConte and I have not been able 

 to confirm them. It is singular that concisus and other similar 

 small Mexican species, should have been assigned to Colpodes in 

 the Chaudoirian sense of that term, for, so far as I can see, the 

 fourth tarsal joint is symmetrical, slender and feebly emarginate. 

 They were originally placed correctly in Anchomenus by Mr. Bates. 

 Nugax Bates, which is another of these very small species, differs 



