THE CANADIAN ENTOMOLOGIST. 99 



The chitinous tegument of the body appears readily, when the mealy 

 vestiture is rubbed and is black and stout. The wings are very papery 

 and a worn Robmice, as it sits on a locust or other tree, reminds one a 

 little of some of the larger wood eating Cerambycidce, such as the Pri- 

 onians. The European Cossus is very sluggish in its habits, whereas 

 Prionoxystus is, when first hatched, comparatively an active insect, flying 

 readily when disturbed. We have two species in our fauna which I refer 

 to Prionoxystus, viz., Robinice Peck, the type of the genus (found from 

 East to West apparently), and Querciperda of Fitch, which I believe is 

 only Eastern and of much rarer occurrence. With Prionoxystus, we have 

 a true Cossus, the Centerensis of Lintner, beside several other species of 

 this Fabrician genus, judging from Authors. We have also three species, 

 Western, of the genus Hypopta, and then the small-sized and singular 

 Cossula magnifica of Bailey, from Florida. I have never recognized the 

 " Zeuzera Canadensis," figured by Herrich-Schaeffer, and it seems to me 

 that the moth is wrongly referred and the probability is that we have no 

 true North American species of Zeuzera. But it may be that the Euro- 

 pean Aesculi has been introduced into the United States. Twice the 

 description of a moth was communicated to me which might have been 

 this species. Nothing is easier than the transportation of wood-eating 

 larvae or pupje. There are three European species of Cossus, and the 

 larva of one of them, Terebra, is said to remain four years in poplar wood 

 before pupating. 



ON PLAGIOMIMICUS RICHII. 



BY A. R. GROTE, A. M. 



This species I have mistaken, according to Mr. J. B, Smith, for Polenta 

 Tepperi in several of my papers. The moth is easily recognized, being 

 of a delicate green color and having the transverse lines similar to 

 Plagiomimicus Pityochromus, which is a blackish fuscous and stouter 

 species. P. Richii has the anterior tibiae armed with a claw and the 

 clypeus provided with a cup-like expansion, less prominent than in 

 Pityochrotnus. P. Richii occurs in Texas, Florida, and I have seen it 

 also from the Southwest. The genus may be further known by the tips of 

 the patagia being somewhat relieved, and belongs to the StiriincE, a group, 

 of Noduidce which I have fully discussed in the pages of the Canadian 

 Entomologist. I regret that I have been mistaken in my identification 



