256 GEO. H. HORN, M. D. 



behind the middle gradually narrowed to tip, margin very narrowly reflexed, 

 sutural stria moderately impressed, surface substriate, a little more coarsely 

 punctured than the thorax, sparsely clothed with short brownish pubescence 

 and with a faint iridescent surface lustre. Body beneath and legs very finely 

 punctulate. Length .24 inch ; 6 mm. (PI. V, fig. 13). 



ATa/e.— Anterior tarsi moderately dilated, anterior tibiae obliquely exca- 

 vated and finely pubescent on the inner side near the tip. The tip is fur- 

 nished with a hook-like process directed from without inwards in addition 

 to the two spurs, reproducing the character found in the posterior tibia of 

 two species of Silpha. 



Occurs in Alaska. 



CHOIiEVA Latr. 

 Form oblong or oblong-oval, depressed. Head suddenly narrowed behind 

 the eyes, occiput elevated received against the apex of the thorax. Eyes 

 flattened posteriorly. Antennae as long as the head and thorax, the last five 

 joints forming an elongate club, the eighth shorter and narrower than the 

 seventh and ninth. Last joint of maxillary palpi elongate conical acute at 

 tip, as long as the third joint. Middle and posterior coxae contiguous, the 

 mesosternum not carinate. Tarsi slender, the anterior dilated in the male, 

 the first joint of middle also stouter but variable in the species. Tibiae finely 

 spinulose along their outer margins, spurs slender and half the length of the 

 first joint. 



By the absence of mesosternal carina this genus is allied to Catop- 

 trichus and Prionochseta, from the former it differs in the structure 

 of the antennae and from the latter more especially in the character 

 of the tibial spurs. It is also worthy of mention that while the 

 species of Ftomaphagus have strigose elytra, those of Choleva with 

 one exception have punctured elytra. 



The species are more difficult to separate than those of Ptomaphagus^ 

 the following table which is necessarily full presents the differences 

 between them. The sexual characters of each species are given as 

 these materially assist in their separation in doubtful cases. 



Hind angles of thorax rounded or obtuse. 

 Elytra simply punctate. 

 Thorax very distinctly narrower than the elytra, not narrowed in front, 

 sides very feebly arcuate. 

 Anterior tibiae of male distinctly sinuate within; abdomen of female 



without impressions egena n. sp. 



Thorax not narrower than the elytra, sides arcuate and narrowed to 

 the front. 

 Anterior femora more or less flat on the under edge, usually glabrous 

 and with a tubercle in the male. 

 Form oblong. 

 Male with the anterior tarsi broadly dilated, the first joint of middle 



tarsus much thickened Inridipennis % Mann. 



Female with ventral segments 3 — 6 foveate at middle. 



luridipennis 9 Mann. 



