AMERICAN COLEOPTERA. 265 



Occurs in the rejxion between the Mississippi River and the Rocky 

 Mountains from Dakota to Texas, also in Utah and Nevada. 



20 C variabilipes, Esch. — Form similar to nebraskenais or brevilabris. 

 Bidy benpath and above black, rarely with a bluish tinge above, legs usually 

 black but varying to testaceous. Head very minutely punctulate, antennae 

 piceous, b'lsal three joints often paler, labrum feebly eniarginale. Thorax as 

 in nebraskensis slightly more sinuate posteriorly, hind angles subacute, surface 

 coarsely and sparsely punctured, slightly more densely along the base, sparsely 

 pubescent. Elytra finely striate, strise finely punctured near the base, inter- 

 vals flat, sparsely obsoletely punctulate and sparsely pubescent. Presternum 

 feebly margined at tip, punctured in front, episterna very obsoletely punctu- 

 late. Metasternal episterna long, margined, moderately densely punctulate. 

 Abdomen as in n/^rer. Length .40— .46 inch ; 10 — 11.5 mm. 



The leiis of this species are usually black but with many variations 

 between this and rufous. When the legs are pale the palpi and basal 

 joints of the antennse are the same. The presternum is more feebly 

 marpued at tip than any of the associated species. 



This species is widely distributed in California. 



21. C. vafer, Lee. — Body beneath black, legs pale. Head metallic blue 

 or violet, very minutely punctulate, antennae rufous, three basal joints paler, 

 labrum truncate. Thorax bluish, subopaque, very sparsely and finely punctu- 

 late and sparsely pubescent, in form resembling nebra-ikensis. Elytra of color 

 and sculpture of nemoralis. Presternum margined at tip, in front punctured, 

 episterna nearly impunetured Metasternal episterna long, punctured and 

 margined. Abdomen as in ni^er. Length .48 inch ; 12 mm. 



The general resemblance of this species to nemoralis, the color 

 together with the finely and sparsely punctured thorax, will serve 

 to distinguish it. 



Occurs in Texas. 



22. C flaccirtus, n. sp. — Body beneath black, legs pale, above entirely 

 green as in nehraskensis. Head moderately shining, minutely punctulate, 

 labrum with very feeble emargination, antennae brown, three basal joints pale. 

 Thorax broader than long, sides moderately arcuate in front, distinctly sinuate 

 posteriorly, hind angles acute, base very little broader than apex, median line 

 and basal impressions moderately distinct, surface subopaque, sparsely and not 

 deeply punctured, sparsely pubescent. Basal line of elytra arcuate at humeri, 

 striae fine moderately closely punctured, intervals flat, finely and moderately 

 densely punctured, sparsely pubescent. Prosternum margined at tip, punc- 

 tured in front, episterna very obsoletely punctate. Metasternal episterna moder- 

 ately densely punctured and margined. Abdomen as in niger, margined with 

 testaceous at tip. Length .44 inch ; 11 mm. 



This species in the form of thorax occupies an exactly intermediate 

 position between vofer and ohsoletua. The thorax is not as opaque as 

 in either of these but is by no means shining, the lustre being about 

 that of leucoscelis. There may be observed on the disc of the thorax 



TBAK.S. AMER. ENT. SOC. V. (34) DECEMBER, 1876. 



