Feb., 1915 Bulletin of the Brooklyn Entomological Society 3 



parent!}' by any one following. According to the original descrip- 

 tion, a copy of which was kindly secured for me by Mr. H. W. 

 Wenzel, it is a different insect entirely. It applies to one of the 

 forms of C. concinnns Boh., the form in which the thorax is more 

 evidently narrower than the elytra, flatter, with sides more con- 

 vergent anteriorly, more evident thoracic crista and impressed 

 foveae on vertex. Forms of this nature seem to be common in the 

 central part of Pennsylvania and I am confident that the descrip- 

 tion applies to them, it fits them so accurately. These forms 

 however, grade insensibly into the more familiar and more ro- 

 bust, so-called typical forms. There are but three species of the 

 genus, if we except C. subareatus Boh. which might possibly be 

 found in the mountains on the north, which are to be found in 

 Pennsylvania. Of these, it is most decidedly not C. platalea Say 

 nor what we now accept as C. corticola Say, therefore by ex- 

 clusion even without regard to the good description, we would 

 naturally feel that it must apply to one of the phases of C. con- 

 cinnus Boh. Other cases that have caused confusion will be dis- 

 cussed in the body of the paper. 



The characters which I have found the most staple and useful 

 are, first, the shape of the rostrum and second, the shape and 

 sculpturing of the thorax. The size of the eyes, general shape of 

 the head, character of funicle, elytra, and so forth, are other fea- 

 tures which were also useful. Most of the species have a some- 

 what similar appearance and they all vary considerably, not only 

 in different parts of their geographical range but even within 

 their own colonies. Good series are therefore essential to a 

 proper understanding of the species. The synoptic table given is 

 primarily based upon that used by Dr. Horn and the genus as 

 restricted here, is as generally accepted and as defined by Le 

 Conte and Horn.* The bibliography given is naturally incom- 

 plete, it being thought necessary to list only the most important 

 papers on the subject. 



* " Classification of the Coleoptera of North America," by John LeConte 

 and George H. Horn, Smithsonian Misc. Coll., Washington, 1883, p. 511. 



