246 THIRTIETH REPORT ON THE STATE MUSEUM. []34] 



" Cossusplagiatus Walk. Rare, July. 



" In 1857, Mr. T. R. Peale, of the U. S. Patent Office, named 

 this species Cossus McMurtrici [sic], and informed me that 

 it was common south of Pennsylvania, but rare in the Middle 



States." 



Cossus crepera Harris. 



This name appears in Dr. Harris' Catalogues of Animals 

 and Plants of Massachusetts, p. 72. 1835, but is not con- 

 tinued in his subsequent reports. In 1839, Doubleday, having 

 suspected its true relationship, writes to Dr. Harris of this spe- 

 cies : " There is a true Cossus with mottled upper wings, 

 and yellow under wings, black at the base and inner margin, 

 RobinicB & 1 " It is decribed by Dr. Packard, loc. cit,, p. 388, 

 as Xyleutes crepera, and catalogued by Grote in his List above 

 cited, as an unrecognized species, under the new generic name 

 proposed by him of Xystus. It is now known to be but the 

 $ form of C. robinice, from the ? of which it differs so greatly 

 in the angulated form of its posterior wings and their yellow 

 color, as to have been mistaken for another species. 







Cossus querciperda Fitch. 



The species described under this name by Dr. Packard, loc. 

 cit., p. 389, is not the one so named and briefly described by 

 Dr. Fitch,* but some other form possibly C. Center ensis.\ 

 The types are the only pair, so far as known, in existence, and 

 are in my Collection. A male and female were taken in copu- 

 lation, June 27,1857, at Schoharie,on the trunk of a young black 

 oak (Quercus tinctoria), -four inches in diameter. A second 

 male was taken at the time, from the same tree, a short dis- 

 tance from the attached pair. One of these, together with the 

 female, it is believed, were subsequently given to Mr. J. W. 

 Weidemeyer, of New York, with other duplicates from my boxes, 

 without statement of their rarity, which at the time was not 

 known. As Mr. Weidemeyer' s Collection is no longer in his 

 hands, the examples have probably been destroyed. 



In March following the capture of the above examples, two 

 Cossus larvae were found in burrows in some pieces of black 



* Trans. N. Y. State Agricul. Soc.,vol. xviii, p. 790. 1859. Fifth Report of the 

 Insects of New York, p. 10 (section 294 of the volume of the Third, Fpurth and 

 Fifth Reports). 



f Canadian Entomologist, vol. ix, p. 129. 1877. 



