Goleopterological Notices. 325 



Prothorax with the sides broadly rounded anteriorly, tlience very strongly 

 convergent behind to the base, the disk anteriorly not narrower than the 

 elytra, distinctly wider than long, convex, not impressed in the middle, 

 very dull and extremely densely punctato-scabrous ; antennae long and 

 slender, the ninth joint much longer than wide, the tenth about as long 

 as wide ; anterior coxae separated by rather less than one-third their 

 width parvulus Cas. 



The individuals of all the species vary remarkably in size. The 

 type of the species described by me as iDarvulus was labeled 

 "Arizona," but as I have subsequently received an ample series 

 from the vicinity of Monterey, California, there may possibly be 

 some error in the former locality. This species is very isolated in 

 many of its characters, and is more wideh^ separated from opacidus, 

 with which it has been considered synonymous, than any other 

 known species except striatus ; its length is 2.4-4.7 mm. 



It is almost superfluous to add that cavicoUis Lee. is in no way 

 allied to striatus, the punctuation of the elytra being of a totally 

 diftereni kind. 



TENEBRIOXID.E. 



This large and interesting family is probably comparatively 

 modern in geological development, and may possibly be contem- 

 poraneous with the Scarabasid-ae. The investigations made known 

 in the follov^-ing pages are intended to exhibit — in an imperfect 

 and fragmentary way — the correlative affinities of the old and new 

 world faunae, as far as it has been possible to procure representa- 

 tives of the foreign genera, and especially in that obscure portion 

 involving: the first few tribes of the subfamilv Tenebrioninae ; alsO' 

 to classify the species pertaining to the more neglected of the 

 North American genera, such as the Thinobates, Coniontis and the 

 Blapstini. 



In comparing the Tenebrionidse of the palaeai'ctic fauna with those 

 of North America, it seems that as far as structural variety and 

 singularity of form are concerned, the nearctic species are con- 

 siderably less highly evolutionized. Such specialized types as- 

 Araioschizus and Usechus, for instance, are represented with us by 

 two small genera, while in Europe there are several, exhibiting^ 

 great variety, such as Adelostoma, Eutagenia, Stenosis, Oogaster,. 

 Dichillus and the curious Leptodes. The very diversified and con- 

 spicuous Pimeliini, the isolated Pedinus and very aberrant Cossy- 



