84 GEO. H. HORN, M. D. 



the smooth spaces more sharply limited and more shining. The es- 

 pecial distinction is, however, based on the form of clypeus and the 

 male sexual characters. 



Occurs in Colorado and Arizona. 



13. C viri«lieyaiiea n. sp. — Form obloug, subdepressed, bright cobalt blue 

 changing to green ; antennse green, more slender externally, third joint as long 

 as the next two ; front feebly convex, rather densely punctured and with two 

 feeble callosities ; clypeus (62) with a feeble, triangular emargination at middle 

 on each side arcuate ; thorax more than twice as wide as long, nearly parallel at 

 middle, narrowed at apex and base ; disc feebly convex, a vague, median, and 

 some irregular lateral depressions ; surface coarsely punctate, sparsely at middle, 

 more densely and subconfluently at the sides ; elytra broader than the thorax, a 

 little wider behind the middle, arcuately narrowing at apical third, margin feebly 

 serrate posteriorly, the apices separately obtuse ; the first costa distinctly elevated 

 from apex to middle, the basal fovea deep, the surface rather coarsely and densely 

 punctured, very irregularly in places with transverse smoother spaces at apical 

 third, behind the middle and obliquely from the humeri ; body beneath more 

 shining than above, coarsely but sparsely punctate ; prosternum not lobed ; last 

 ventral with serrulate margin ; anterior tibia with feeble tooth, serrate on its 

 distal edge. Length .32- .36 inch -,8-9 mm. (Fig. 61.) 



ilffflZe.— Prosternum very densely punctured and pubescent; anterior tibia (65) 

 slightly arcuate, a slight dilatation one-third from base, a strong acute tooth near 

 the apex ; middle tibia slightly sinuous within, the posterior straight ; last ven- 

 tral segment (63) deeply semi-circularly emarginate, the last dorsal coarsely punc- 

 tate and feebly emarginate at apex. 



Female. — Prosternum coarsely, moderately, closely punctate ; anterior tibia 

 feebly arcuate; middle and posterior straight; last ventral (64) longer than in 

 the male, feebly but rather broadly emarginate ; last dorsal closely punctate, 

 subtruncate. 



This species has a general superficial resemblance to Harrisii, but 

 is more densely punctate and less shining. The two species differ 

 primarily in their sexual chai'acters. 



Occurs in California, Nevada and Montana. 



Group IV. 



This group contains nearly one-third of all the species in our fauna, 

 and is of very difficult study, and from the similarity of the elytral 

 sculpture in seven of the species it is necessary to have recourse to 

 sexual characters. The species divide themselves into two equal 

 series — those Avith the prosternum lobed in front and those with the 

 prosternum truncate. The lobe is here never so well marked as has 

 been observed in several other groups, and in fact in several species 

 consists of a mere arcuatiou of the anterior margin of the proster- 



