180 THE CANADIAN ENTOMOLOGIST. 



Hind femora less than twice as long as the pronotum ; ex- 

 posed portion of ^ tegmina almost as ample as the pro- 

 notum pachyinerus. 



Hind femora more than twice as long as the pronotum ; exposed 

 portion of ^ tegmina less than one-third as ample as the prono- 

 tum dorsalis. 



Inner tooth of ^ cerci long ; lateral carina of pronotum not sharply 

 pronounced gibbosus. 



Drymadusa Stein (Berl. Ent. Zeitschr., IV., 257;. 



Recognized in an undescribed species in my collection, represented 

 by a single ? from Oregon, in which the tegmina are very abbreviated 

 and the ovipositor apically decurved. The genus has not before been 

 known to occur in the New World, and appears to be the only genus of 

 Decticidae common to the two worlds. I have no European species with 

 which to compare it, but from the description of the genus it seems to 

 belong here, though the pronotum has a distinct median carina pos- 

 teriorly. * 

 Orchesticus Saussure (Rev. Mag. Zool., 1S59, 201). 



This genus was founded upon a species from Tennessee, 0. americanus, 

 Sauss., unknown to me. The genus is, however, the richest in species of 

 any of our Decticidse, no less than six nominal species having been 

 described, some of them (not yet carefully studied) possibly synonymous, 

 and all, excepting the typical species, described under other generic names. 

 These are, to give them in the order of their publication-: Anabi-us hal- 

 demanii Girard, Anabrus minutus and A. steve?isonii Thomas, and 

 Thyreonotiis cragini and T. scudderi Bruner. All of these are from the 

 Mississippi Valley and the mountain region on the west, which seem to 

 be the home of the genus, though it occurs also sparingly on the 

 Atlantic slope. In a preliminary arrangement of the species in the 

 collections at hand I have separated about a dozen species. 



Tropizaspis Brunner (Rev. Syst. Orth., 187). 



To this genus belongs Arytropteris stiindachneri Herm., from Paget 

 Sound. The genus seems to be peculiar to the Pacific Coast, from whence 

 half a dozen species are known to me, none but the above described, and 

 this not heretofore referred to the present genus. 



