AMERICAN COLEOPTERA. 151 



From the collection of Baron Chaudoir I obtained a specimen of the 

 species named villigera, and find no differences between it and his types 

 of laticollis except that the hairs of the surface are better preserved. 



Occurs in Colorado, Texas and New Mexico. 



C cribricollis Dej. — Piceous, legs and antennae rufous. Head coarsely and 

 deeply punctured, less densely in the middle of the front. Thorax nearly one- 

 third wider than long, base equalling the length, sides arcuate, slightly sinuate 

 in front of the hind, angles which are subacute but not prominent, margin broad, 

 translucent, equal in width from base to apex, moderately reflexed and with 

 a variable number of setigerous punctures, not exceeding three, disc moderately 

 convex, median line distinctly impressed, surface coarsely and deeply punctured, 

 more sparsely at middle but not very densely at the sides. Elytra oval, usually 

 a little broader behind, piceous, very rarely with an indistinct humeral spot and 

 pale margin, moderately deeply striate, the striae punctured, intervals usually 

 convex and irregularly punctulate. Prothorax beneath coarsely and deeply punc- 

 tured, metasternum at sides less coarsely punctured, abdomen sparsely punctured. 

 Length .36 — .44 inch; 9 — 11 mm. 



Male.— Anterior tarsi with three dilated joints biseriately lamellate beneath. 

 Anal segment feebly emarginate at middle and each side bisetose. 



Female. —Tarsi slender. Anal segment entire, bisetose each side. 



The variations- of this species are not very striking, notwithstanding 

 its very wide distribution. In several specimens before me from Maine 

 and New Hampshire, the margin of the thorax is rather wider and more 

 translucent and the edge less arcuate in outline. There is also a more 

 evident paler humeral space and the pale edge of the elytra is quite 

 distinct. These can not be considered a distinct species as it is quite 

 impossible to draw any line with sufficient sharpness between them and 

 the more usual form. As the species approaches the Pacific coast the 

 elytra! intervals become somewhat flatter, and the individuals are of an 

 average greater size than those of the more eastern regions, this form 

 might be considered represented by the name abstrusa Lee. 



The synonymy of this species is also somewhat confused. That 

 the species here described is cribricollis Dej., there can be no doubt. 

 I fully agree with Dr. LeConte in his determination of marginata Kby., 

 as a synonym, for the following reasons : it is the more common species 

 of the region from which Kirby's material was collected, corresponds 

 closely with the description, and is the only widely margined species 

 known to occur there. Chaudoir considers planipennis Lee. ( brevipennis 

 Zimm.), identical with Kirby's, which can not be true from the fact that 

 the former occurs in the Rocky Mountain region and Oregon, not coming 

 east of the Mississippi, moreover Kirby would not haive failed to mention 

 the decidedly bluish-green color of the elytra. 



Occurs from Newfoundland through the New England States to 



