60 U. S. P. R. R. EXP. AND SURVEYS ZOOLOGY 47TH PARALLEL. 



ASEMUM Serv. 



A. asperum, nigro-piceum, tenuiter pubescens, capite scabro-punctato, oculis magnis valde 

 emarginatis, thorace latitudine breviore rotundato punctate, medio late excavato, versus latera 

 punctis elevatis exasperate, elytris subtiliter scabris, lineis duabus obsoletis vix distinctis. 

 Long. -7 9. 



Lee. Proc. Acad. Nat. Sciences, 7, 18. 



Prairie Paso, Dr. Cooper, found in July and August. This fine species seems intermediate 

 between Criocephalus 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. 



OPSIMUS.]. Esch. 



0. quadrilineatus, piceus pubescens, capite punctato, canaliculate, thorace confertissime 

 punctulato, canaliculate, 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 Muls.) 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. 



O. aeneum, aeneo-piceum, parcius pubescens, thorace latitudine breviore, rotundato punctulato, 

 antice posticeque marginato, elytris thorace paulo latioribus, nitidissimis, parce punctatis, femo 

 ribus valde clavatis, antennis ad basin rufescentibus. Long. *3. 



Phymatodes aeneus Lee. 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 C. aereum Newm. 



C. Manner Jieimii, piceum subtiliter dense pnbescens, 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. Kesembles 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. 



