March, 1922.] Chamberlin : The Genus Pcecilonota. 65 



Alan Nicolay, of Brooklyn, N. Y. The other specimen bears the date 

 5-6-99 and a number 226, taken in Canada, exact locality not given, 

 sent me by Dr. Swaine. 



The species resembles montanus more than any other of our species, 

 but is easily separated from this as well as all other species of the 

 genus by the convex body and the elytral apices (see fig. 6, Plate V). 

 The width of the body is greater in comparison to the length than in 

 any other of our species. 



Acknowledgment. 



I am deeply indebted to the following: Dr. Nathan Banks, who 

 secured for me a photograph of the type of P. dcbilis Lee. and also 

 sent a sketch of the last ventral segment of that species. To Dr. E. C. 

 Van Dyke, who sent in the photographs of the type J* and 5 of P. 

 bridwelli and the drawings of the last ventral segment of this species. 

 To the following gentlemen who kindly loaned material from their 

 collections: Mr. Warren Knaus, C. A. Frost, H. E. Burke, Dr. J. M. 

 Swaine, Alan Nicolay, C. W. Leng, Chas. Liebeck, H. W. Wenzel and 

 Frank R. Mason. 



To Professor B. B. Fulton of this station for recopying the draw- 

 ings and to Professor F. H. Lathrop for assistance in photographing 

 certain species. 



EXPLANATION OF PLATES. 



Plate V. 



Male P. montanus n. sp. Type. 

 Female P. montanus n. sp. Type. 

 Female P. debilis Lee. Type. 

 Male P. bridiuelli Van Dyke. Type. 

 Female P. bridivelli Van Dyke. Type. 

 Male P. fraseri n. sp. Type. 

 Male var. californica n. var. Type. 

 Female var. californica n. var. Type. 

 Male P. thureura Say. 

 Female P. thureura Say. 



Plate VL 

 Male P. ferrea Mels. 

 Female P. ferrea Mels. 

 Male P. cyanipes Say. 

 Female P. cyanipes Say. 



