60 
U. S. p. R. R. EXP. AND SURVEYS ZOOLOGY 47TH PARALLEL. 
AsEMUM Serv. 
A. asperum, nigro-piceum, tenuiter pubescens^ capite scabro-punctato, oculis magniis valde 
emarginatis, thorace latitudine breviore rotundato piinctato, medio late excavato, versus latera 
punctis elevatis exasperate, elytris subtiliter scabris, lineis duabus obsoletis vix distinctis. 
Long. •'7 — '9. 
Leo. Proc. Acad. Nat. Sciences, 7, 18. 
Prairie Paso, Dr. Cooper, found in July and August, This fine species seems intermediate 
between Criocepbalus and Asemum ; the eyes though as large as in the former genus are deeply 
emarginate ; the antennae are hardly half as long as the body, and pubescent. The discoidal 
excavation of the thorax does not extend much in front of the middle. 
OpsiMusj Esch. 
0. quadrilineatus , piceus pubescens, capite punctato, canaliculate, thorace confertissime 
punctulato, canaliculato, lateribus medio spina acuta retro tendente armatis, pone spinam con- 
cavis, ante spinam rotundatis ; elytris elongatis, saepe fusco-testaceis, densissime punctulatis, 
lineis utrinque duabus tenuibus elevatis^ tertiaque externa obsoleta; femoribus crassis, oculis 
divisis. Long. -37. Tab. II, fig. 10. 
Mann. Bull. Mosc. 
Sitkha, Baron Chaudoir and Col. Motschulsky ; Oregon, Dr. Cooper. The genus Opsimus 
•was founded upon this species, but I have not found any description of it in print. It is closely 
allied to Tetropium (Criomorphus lluls.) in the form of the head and eyes, but the maxillary 
palpi are much longer than the labial, and the anterior coxae are not transverse, and but slightly 
angulated externally ; the'antennae taper gradually outwards, and are quite hairy, much longer 
in the male than in the female. 
Callidium Fabr. 
C. aeneum, aeneo-piceum, parcius pubescens, thorace latitudine breviore, rotundato punctiilato, 
antice posticeque marginato, elytris thorace paulo latioribus, nitidissimis, parce punctatis, femo- 
ribus valde clavatis, antennis ad basin rufescentibus. Long. "S. 
Phymatodes aeneus Lec. Proc. Acad. Nat. Sc. 7, 18. 
One specimen found by Dr. Cooper on the journey from Vancouver to Yokolt Plain. This 
species somewhat resembles in appearance G. aereum Newm. 
C. Mannerheimii, piceum subtiliter dense pubescens, thorace latitudine breviore, lateribus ro- 
tundatis, utrinque angustato, dense punctulato, linea dorsali sublaevi, elytris a basi ad dimi- 
dium obscure ferrugineis, femoribus ad basin rufo-piceis. Long. "44. 
Callidium dimidiatum\\ Mann. Bull. Mosc. 1846. 
One specimen, Steilacoom, Dr. Suckley. Eesembles C. dimidiatum Kirby, (palliatum Hald.,) 
but differs in the thorax, being narrowed before as well as towards the base. 
C. vulneratum, nigro-piceum nitidum, capite thoraceque fortius punctatis, hoc latitudine vix 
breviore^ lateribus late rotundatis, ad basin angustato, parce pilosello ; elytris a basi ad medium 
fortiter minus dense punctatis, obscure ferruginus, dein subtiliter punctulatis nigro-piceis, 
fascia transversa albicante subelevata ad medium notatis. Long. "35. 
