NORTH AMERICAN COLKOPTERA. 221> 



of hind tiirsus scarcely longer than the next two, the claws broadlj' 

 appendiculate and divaricate. Tibiaj not eniarginate. 



This genus, now for the first time introduced into our fauna, seems 

 t(j bear nearly the relationship to Tymnes that Nodonota does to 

 Colaspm. 



The emargination of the clypeus is jiarticularly noted by Chai)uis, 

 but not mentioned by Lefevre. In truth, the character is variable 

 in specimens of the same species. There is no basal marginal line 

 to the thorax. 



The species known to me are as follows : 



Clypeus distinctly narrower at base between the insertions of the antennfe, 

 apical edge feebly emargiuate without prolonged angles; blue or green, with 

 violaceous surface lustre , violaceipeniiis. 



Clypeus not narrowed at base, apical border deeply eniarginate. 



Clypeal emargination semicircular, the angles but little prolonged ; form short 

 and robust, head and thorax dull; legs black, slightly bronzed. ..opacicollis. 



Clypeal emargination deep and triangular, the angles triangularly })rolonged 

 to the front ; form somewhat oblong, surface shining; legs testaceous. 



Tiridiiuicaiis. 



C. violaceipeuiiis u. sp. — Ovate, convex, above bluish green, the elytra 

 with a violaceous tinge inclining to cupreous, beneath piceous, with dull green 

 lustre. Antennae piceous, the tarsal joints paler. Head alutaceous, coarsely 

 not closely punctate, clypeus much narrowed at base, the apex nearly truncate. 

 Thorax less than twice as wide at base as long, sides slightly arcuate and strongly 

 convergent to the front, hind angles rectangular, disc convex, equally punctate 

 over the whole surface, punctures rather fine and not closely placed. Elytra 

 scarcely a fourth longer than wide, the punctures coarser than on the thorax, 

 not closely placed, substriately arranged. Body beneath smooth, abdomen alu- 

 taceous, sparsely punctate. Legs piceous, with slight green lustre. Length .15 

 — .17 inch. ; 3.75—4.5 mm. 



Of this species two females alone are known to me. As is usual, 

 the apical margin of the thorax is prolonged, entirely concealing 

 the head from above. 



Collected in Arizona, precise locality unknown, but from tlie 

 southern part. 



C. opacicollis n. sp. — Ovate, robust, head and thorax usually dull green 

 and subopacjue, elytra bluish and nioresliining, beneath piceous, faintly greenish. 

 Aiitenme testaceous, the outer five joints black. Head alutaceous, finely and 

 sparsely ])unctate, clypeus broader at base, apex semicircularly eniarginate. the 

 angles not prolonged. Thorax more than twice as wide at base as long, sides 

 arcuately divergent in front, hind angles sharply rectangular, disc convex, equally 

 punctate, punctures fine and sparse. Elytra but little longer than wide, punc- 

 tures coarser than those of the thorax, arranged in irregular geminate strise. 

 Body beneath smooth, shining, abdomen with very few punctures. Legs piceous. 

 faintly bronzed. Length .18 incli. ; 4.5 mm. 



TKANS. AM. ENT. SOC. XIX. AUGU.ST, 1892. 



