154 GEO. H. HORN, M. T>. 



and in Colorado. In the latter region it has been found at an elevation 

 of thirteen thousand feet at Argentine Pass. 



C americana Dej.— Piceous, feebly shining, antennae, legs, humeral spot 

 and narrow side margin rufo-testaceous. Form rather slender. Head sparsely 

 •punctured, especially on the front. Thorax a little longer than wide, narrowed 

 at base, sides narrowly margined, irregularly arcuate in front, sinuate posteriorly, 

 hind angles somewhat obtuse, the margin narrowly reflexed with one setigerous 

 puncture, disc moderately convex, coarsely and equally punctured, median line 

 rather deeply impressed. Elytra oval, broader posteriorly, disc rather flat, with 

 moderately deep finely punctured striae, the intervals rather flat and densely 

 punctur 1, the punctures much coarser than those of the striae, surface subopaque 

 piceous, nearly black, a large humeral spot and narrow side margin rufo-testa- 

 ceous. Prothorax beneath coarsely punctured, metasternum at sides less coarsely. 

 Abdomen sparsely punctured. Length .44 — .64 inch; 11 — Ifi mm. 



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

 Anal segment emarginate at middle with one seta each side. 



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

 Chaudoir in his essay retains venator distinct from americana 

 basing his determination on two specimens of the former and three 

 of the latter. I believe with Dr. LeConte that the two species are 

 perfectly identical. 



Occurs from Canada to the Middle States and Kansas. Chaudoir 

 claims to have seen it from Louisiana but our collections do not contain 

 any from so far south. 



C cribrata. Lee— Form rather elongate, piceous, antennae and legs rufo- 

 testaceous, elytra with a slightly greenish surface lustre. Head coarsely and 

 deeply punctured, smoother on the front, cribrate above and behind the eyes. 

 Thorax longer than wide, narrowed at base which is strongly arcuate, sides 

 moderately but irregularly arcuate in front, slightly sinuate near the hind angles 

 which are obtuse, margin extremely narrow, disc convex, median line broadly 

 but not deeply sulcate, surface coarsely and rather densely punctured, often 

 cribrate at the sides. Elytra oval, scarcely wider behind, with deeply impressed 

 punctured striae, the intervals convex and with a single irregular row of punc- 

 tures, margin very narrowly rufous. Prothorax beneath cribrately punctured, 

 metasternum at sides coarsely and densely punctured, abdomen very sparsely 

 punctured. Length .36 — .42 inch; 9 — 10.5 mm. 



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

 Anal segment entire, bisetose each side. 



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

 This species has some superficial resemblance to borealis but the 

 thorax is more coarsely punctured and the margin extremely narrow. 

 The hairs of the surface are comparatively long and erect, the setae of 

 the margin of the thorax at least three in number. The elytra are en- 

 tirely piceous with faint tinge of greenish, the humeri never pale except 

 from immaturity and the lateral margin is very narrowly rufous. 

 Occurs in western Kansas. 



