182 THE CANADIAN ENTOMOLOGIST. 



Steiroxys Hermann (Verh. Zool.-bot. Ges. Wien, XXIV. 207). 

 We possess three species of this genus, two of which have been 

 described : S. ti'ilmeatus {Thamnotrizon trilineatus Thom.), the type of 

 the genus from Wyoming and Utah, and S. pallidipalpus (Dectiats palh- 

 dipalpus Thom.), from Utah, Idaho and Nevada ; and apparently a third 

 species from Northern California, Oregon and Alberta, which may be 

 called S. borealis. They may be distinguished as follows : — 



Abdomen conspicuously ornamented with a median series of V-shaped 



black spots trilineatus. 



Abdomen with no conspicuous median abdominal markings. 



Hind femora very long, more than three and a-half times longer 

 than the pronotum \ dorsal field of pronotum much less than twice 



as long as greatest breadth borealis. 



Hind femora not so long, being scarcely more than three times as 

 long as the pronotum ; dorsal field of pronotum almost twice as 



long as greatest breadth pallidipalpus. 



Idionotus (tStos, I'WTos), Gen. nov. 

 This genus is established on a couple of undescribed species, one in 

 the U. S. National Museum, from California, the other in my own collec- 

 tion, collected by Kennicott somewhere on his explorations in or going to 

 Alaska. It closely resembles Steiroxys. 



Clinopleura (kAu'oj, irXevpd), Gen. nov. 

 This name is proposed for Steiroxys melanopleura Scudd., and its 

 allies. It is nearly related to the European Psorodonotus, but is abund- 

 antly distinct, with no such prolonged pronotum The typical species 

 comes from Southern California and Utah, and two other Californian 

 species are in the U. S. National Museum. 



Plagiostira Scudder (Wheeler's Ann. Rep., 1876, 501). 

 Founded upon P. albojiotata Scudd., from Northern New Mexico. I 

 have what is apparently a second and larger species of uniform colouring, 

 but in poor condition, taken on the surveys for the Northern Pacific R. R. 

 Ateloplus (areAry?, ottAoi'), Gen. nov. 

 A peculiar form, apparently nearly allied to Idiostatus and Cacopteris 

 and closely resembling them in general appearance, but remarkable for 

 having both margins of the upper surface of the fore-tibiag entirely devoid 

 of spines, except a single one at the apex on the outer side. I know of 

 but one species, from San Diego, California, represented by a single $ 

 in the U. S. National Museum. 



