192 GEO. II. HORN, M. D. 



D. Crotchii, Horn, n. sp. 



D. Backii, Kby., loc. cit., p. 134, pi. 2, fig. 6.; Lee, Journ. Acad., 1S.')(;. p. 280. 



D. fuscula, Lee, loc. cit., p. 281. 



D. fulgida, Lee, loc. cit., p. 279. 



D. truncata, Lee, loc. cit., p. 281. 



D. clypeata, Horn, n. sp. 



D. albicoUis, Burm., Handb. IV. 2, p. 74; Lee, loc. cit., p. 281. 



D. valida, Lee, loc. cit., p. 281. 



D. sulcata, Lee, loc. cit., p. 281. • 



D. pusilla, Lee, loc. cit., p. 282. 



€<EIVONYCIIA, n. g. 



This genus agrees with Dichelonj/cha in all respects, e.xcept in tlie 

 following characters. 



Head moderately deeply inserted, e3'es partially concealed by the 

 anterior angles of the thorax. Thorax without trace of sub-apical, 

 impressed line. First abdominal segment in great part concealed by 

 the coxae, abdomen apparently with five segments only. 



In Dichelonycha the head is prominent, the eyes distant from the 

 thoracic angles, the first abdominal segment at least half visible at the 

 sides, and distinctly visible at middle. The antennae of Diclubni/chi 

 are nine-jointed. 



Three species are referred to this genus, difiering especially as 

 follows : 



Elytra oblong, body winged. Antennse ten-jointed rotiiiifla<a. 



Elytra oval, body with very feeble wings. Antennse nine-jointed. ..so<*iala.«*. 

 Elytra oval, body apterous. Antennae eight-jointed ovi|>ciinii$. 



C rotundata, Lee, (Dicheloni/cha), Jonm. Acad., 1856, p. 281.— Form ob- 

 lonc, color brownish testaceous without metallic lustre. Head coarsely and 

 moderately deeply punctured, frontal suture distinct, feebly impressed. Clypeus 

 truncate in front, margin feebly, angles more broadly reflexed and slightly 

 prominent. Thora.x rather more than twice as broad as long, sides gradually 

 divergent posteriorly, hind angles very broadly rounded, disc shining, coarsely 

 but sparsely punctured, margin with rather long fimbrise. Elytra oblong, 

 slightly broader behind, coarsely punctured, slightly rugulose at middle, and 

 with very sparse and inconspicuous pubescence. Body beneath very sparsely 

 punctured and pubescent. Length .32 — .40 inch; 8 — 10 mm. 



This species may be known by its ten-jointed antenna). Its form 

 and general appearance cause it to resemble some of the members of 

 the group Rhizofrogi. 



Occurs from Oregon to Fort Yuma, Cal., but rare. 



C. socialis, n. sp. — Form oblong oval, narrower in front, color brownish 

 testaceous, sides of elytra somewhat paler. Clypeus hemihexagonal, margins 

 reflexed, more broadly in front, anterior edge emarginate, angles moderately 

 prominent, surface roughened by the confluence of large but superficial punc- 



