NORTH AMERICAN COLEOPTERA. 89 



8.— Head always darker than the thorax and elytra, punctuation of abdomen 

 above very evident. 

 Species smaller, more slender and convex, fovea of fourth ventral % not 



very large Id. Lrecoiltei. 



Species larger, more depressed, fovea of fourth ventral % conspicuously 



laige 12. pimeriaiitini. 



Head, thorax and elytra rufo-testaceous or pale castaneous ; punctuation of ab- 

 domen almost obsolete ; fovea of fourth ventral % small, often punctiform. 



1.3. arizoiiense. 



1. C. badiuMlGrav.— Uniformly brown in color, either darker or paler, hea4 

 usually slightly darker. " Antennae pale brown, nearly as long as the head and 

 thorax, third joint conspicuously longer than the second. Head shining, oval 

 sometimes broadly, sides nearly parallel, posteriorly suddenly constricted, surface 

 not conspicuously coarsely punctured, the punctures not close except at the sides, 

 front very sparsely punctured. Thorax about one-fourth longer than wide, sides 

 very feebly arcuate, median smooth space well defined, on each side of which the 

 punctures are coarse and numerous, a little less closelj placed near the base and 

 front angles. Elytra a little longer and one-half wider than the thorax, a little 

 longer than wide conjointly, surface rather coarsely and deeply punctured the 

 punctures close but not dense. Abdomen above comparatively finely and sjjarsely 

 punctured, beneath a little more coarsely punctured, shining. Legs pale rufo- 

 testaceous. Length .40-. .5(1 inch; 12.5 mm. 



Male {Complete form). — Third ventral segment furnished at middle with a mod- 

 erately long, slightly elevated transverse plica setose posteriorly; fourth ventral 

 prolonged at middle in the form of a lobe with parallel sides and obtusely rounded 

 tip, extending to the middle of the sixth segment, bearing long fimbrise from the 

 margin and lower surface; at the middle of the segment is a large puncture bear- 

 ing short setae. Last ventral segment entire (PI. 1, fig. 1). 



Male { Imperfect form) . — Fourth ventral without any trace of the prolongation, 

 the jalica of the third and fovea of the fourth as in the perfect form (PI. 1, fig. 2). 



Female. — Third ventral segment with a short setigerous plica at middle (PI. 1. 

 fig. 3). 



Thi.s species being so commou and generally well known, forms witli 

 hicolur., convenient points of comparison for less known species. 



Very little variation is observed in Ladiiim beyond the change of color 

 from dark to lighter. As a general rule the males have longer and 

 broader heads than the females, but this is by no means constant. 



Occurs from Canada to Florida, westward to Nebraska and N. Mexico. 



'2, C floriflanum Lee. — Piceous, shining, sparsely pubescent. Antennae 

 brown, two basal joints paler, nearly as long as the head and thorax, third joint 

 longer than the second. Head oval, hind angles broadly rounded, sides slightly 

 arcuate, surface shining, moderately coarsely punctured, the punctures denser at 

 the sides and very sparse on the front. Thorax about one-fourth longer than wide, 

 narrower than the head, sides nearly parallel, median smooth space well defined, 

 on each side of which the punctures are numerous, coarse and deep, arranged as 

 in badium. Elytra one-third wider than the thorax and longer, longer than wide 

 conjointly, surface coarsely and deeply punctured, the punctures closer and more 



TRANS. AMER. ENT. SOC. XII. (16) FEBRUARY, 1885. 



