NATURAL SCIENCES OF PHILADELPHIA. 45 



on the myrtle (according to Sa}-). This cannot, I think, be the 

 G. picipe.H^ Oliv., for the tliorax tliere is fine!}' punctate and the 

 legs obscure ; it was probably Tijpojphorus tricolor. 



4. C. arizonae, sp. n. 



Oblong, ovate; reddish-brown, elj'tra red; head rugosely punc- 

 tate; clypeus nearly smooth, emarginate; antennae very distant; 

 thorax transvei'se, sides but little rounded, rather broadly expla- 

 nate, coarsely rugosely punctate ; elytra rugosely punctate with 

 traces of smooth raised interstices; under side alutaceous, faintly 

 punctulate ; thoracic epipleurse with a few punctures. L. .32. 

 Ai'izona (Leconte). 



^ 5th segment triangularly emarginate. 



The anterior tibice are deeply sulcate for the tarsi and biden- 

 tate at the apex. 



6. C. nigrocyanea, sp. n. 



Ovate, bluish-black, beneath purplish ; thorax deeply and very 

 closely punctate ; the interstices irregularly broad and smooth ; 

 sides explanate, distinctly angulate in the middle ; epipleurae 

 deeply punctate ; elytra deeply and closely seriate punctate, the 

 rows somewhat geminate; ventral segments alutaceous, hardly 

 2Junctulate. L. .23. Arizona (Leconte). 



The unique specimen before me is unfortunately without a head. 



6. C. tristis, Oliv. Enc. Meth., v. 889; piltda, Germ. sp. nov., p. 567 ; ovata. Say, 

 J. Acad., iii. 442; convexa. Say, 1. c. p. 443; puiicticolUs, Say, 1. c, hume- 

 Talis ; Leo. Pr. Acad. 1858, p. 85. 



This is the most variable insect in sculpture and form that I 

 have seen ; but 1 am entirely unable to draw an}'^ lines between 

 the forms quoted above. It is convex, shortly ovate ; antennae 

 comparatively short ; last five joints distinctl}' thickened, base 

 yellowish ; the head is finely and sparingly)- punctate ; thorax 

 subtransverse, sides margined, rounded, hind angles prominent, 

 rectangular; base margined with a row of punctures inside the 

 margin ; disk variously punctate, sometimes with close rather 

 elongate punctures, or sparsely and rather finely punctate; elytra 

 either deeply irregularly punctate, or more finely and subseriate 

 punctate ; the rows geminate, leaving irregular smooth inter- 

 stices, humeral callus always prominent ; legs black or red ; epi- 

 pleura3 punctate or almost smooth. L. .16-.18. Atlantic region. 



