242 THE CANADIAN ENTOMOLOGIST. 



represented by but a (ew specimens each, tliey are extremely difficult to 

 understand. And this misunderstanding is frequently strengthened by the 

 fact that in a single locahty races are likely to be found quite pure and 

 uniform. 



The way was paved to a proper understanding of the group by Stal 

 ill the "Enumeratio," where he separated from the old genus Corizus a 

 number of subgenera, leaving under the original name only certain old 

 species grouped around crassicornis. These subgenera were exceedingly 

 well founded, since in a study of many species, other co-ordinated 

 characters may be discovered which were not used by Stal. These groups 

 are as well founded as the generally recognized and nearly related 

 Maccavethus, Brachycarenus and Corizomorpha, and are much more 

 readily separable than many other genera of the Coreidae. For my own 

 convenience I call them "genera." Apart from other considerations, 

 however, a careful study of these groups of Stal is the only path towards 

 bringing order out of the utter confusion in the arrangement of the species 

 in most American collections. 



I have already before me something more than a thousand specimens 

 of this group. Many of these specimens have previously been studied by 

 Dr. Uhler and Mr. Heidemann. I have made a preliminary arrangement 

 of all this material, and shall be glad now to undertake the determination 

 of other collections, adding to such collections forms licking to them in 

 return for any duplicates retained. 



Genus Corizus, Fall. 

 But one species belonging to this genus, as limited by Stal, has ever 

 been described for North America — iiov^boracensis, recognized by Fitch 

 and described by Signoret. In American collections pale forms of this are 

 commonly referred to Jiyalvms, which belongs in a different genus. 

 Novaborace?isis is one of the most distinct species in the American fauna, 

 and is represented by various forms, especially towards the West. Pallidus 

 is a very common pale form found from Colorado to Nevada, but it agrees 

 in all essential characters with novceboracejisis^ and intergrades it through- 

 out its range. Some of the commoner forms of this species may be 

 temporarily separated as follows : 



