Casey — A Revision of the American Paederini. 203 



species, which are both represented by good series. In the 

 type specimen of punctatus there is a small and feeble 

 tumidity on the surface between the gular sutures just behind 

 the support of the mentum, which is probably homologous 

 with the subspiniform process, in the same position, generally 

 characterizing Pycnorus; it seems to be an inconstant charac- 

 ter in Pycnorus and is extremely rare in Orus and probably 

 of sporadic or accidental occurrence, as I have only noticed it 

 in this single specimen out of many examined. 



Scopaeus Er. 



Renewed comparisons of the European and American 

 species — the latter separated by the writer under the name 

 Leptorus, — impels him to reverse his former opinion and to 

 unite these with Scopaeus. The genus Scopaeus will thus 

 include all the European Scopaei and the equally numerous 

 American species, as described in the table given below, as 

 well as a number of Mexican and Central American species 

 made known by Dr. Sharp ; possibly also many forms inhabit- 

 ing other parts of the world. Thus extended in geographical 

 distribution, as well as numbers, some variability in generic 

 characters might be anticipated but this seems to be com- 

 paratively unimportant. The European species are more 

 linear and parallel, with less apical anterior thoracic angles, 

 as a rule, than the American and with the suture separating 

 the pronotal hypomera better developed ; in addition the 

 basal joint of the hind tarsi is generally more decidedly longer 

 than the second. In the American species the basal joint is 

 usually subequal to the second, but in piciptes it is notably 

 longer than the second as in the European forms, and, in at 

 least one European species before me, the two basal joints 

 are equal. The sculpture of the European species is generally 

 coarser and less dense than that of the American, but I can 

 find no character of sufficient importance or constancy to 

 warrant generic separation. The large spongy -pubescent 

 fovea immediately above each eye is present throughout but 

 rather more developed in the European species. It is singular 



