THE CANADIAN ENTOMOLOGIST 309 



Family Icteridae. 

 Colpocephalitm mirabile Carriker. 



Order Coracii formes. 

 Family Caprimulgidae, 



Colpocephalum extra neum Carriker. 



Family Rhamphastidse. 



Myrsidea viclrix Waterston. 



Family Alcidinidse. 



Nitzschia latifrons Carriker. 



The genus was well characterized by Waterston, but, as it 

 appears to be a member of the group under discussion, the de- 

 scription has been repeated, with certain modifications and ad- 

 ditions, in order to emphasize the resemblances to and differences 

 from these other genera. No list of included species has heretofore 

 been published. 



Many of the included species, especially those upon the 

 Corvidce, are in some respects among the most peculiar of all the 

 Mallophaga, due to the curious modifications of the metathorax 

 of the female. Waterston has suggested that the genus should be 

 still further divided, these species not sexually dimorphic being 

 placed in another genus. However, it hardly seems best to do 

 this, for every degree of dimorphism appears-, nor are the modifica- 

 tions of any constant type. Even the asters of heavy spines on 

 the second sternite of the abdomen, which appear in almost all 

 of the species are lacking in M. sjoestedti, in other respects one of 

 the most typical members of the group. It would seem that there 

 is throughout the genus an "inherent" tendency to vary, and any 

 further division is liable to result in artificial groupings. The 

 figures are of M . diffusa (Kel.), a typical species. 



Genus Dennyus Neumann. 

 V\v<. 10a, L5. 

 Nitzschia (not of Baer), Denny, Mon Anopl. li;it., p. 230. ( bS42j. 

 Den nyhsNemnmin, Pull. Sec. Zool. f ranee, V )l.20, p.60. (1006) 

 Menoponida? with distinct patches of spines upon the ventral 

 face of the pcsterior femora and upon the 8th and (5th abdominal 

 sternites. Thorax distinctly 3-segmented, the prothorax very 



