GGO 



Mr. T. D. A. Cockerell — Descriptions and 



Avidth. 33 or 34 scales in a longitudinal series. Dor.=al 

 8 or 9; origin equidistant from anterior {^) or posterior ( ? ) 

 margin of eye and posterior edge of caulal fin ; fin more 

 elevated in the male than in tlie female, but not nearly 

 reaching the caudal when laid back ; distance from dorsal to 



Petalosoma amazonnm, S and $, enlarged to \h. 



caudal twice or nearly twice the least depth of the caudal 

 peduncle. Anal 10, in the female nearly in the middle of the 

 length of the fish, in tiie male originating a little behind the 

 end of the pectoral, which is shorter than the head. Pelvics 

 6-rayed, inserted below the middle of the pectoral. Caudal 

 subtruncate. Coloration olivaceous. 



Two specimens, a male of 35 and a female of 51 mm., 

 from Obidos. 



Petalosoma cnltratum differs from this species especially in 

 the deeper and more strongly compressed body and more 

 posterior dorsal fin. In tiie type, a male of 50 mm., the 

 depth of the body is 3^ in the lengtli, the dorsal, when laid 

 back, nearly reaches the caudal, and the distance between 

 these fins is equal to the least depth of the caudal peduncle. 



LXXIV. — Descriptions and Records of Bees. — XXXIX. 

 Ey T. D. A. CocKEiiELL, University of Colorado. 



Halicfus provoncJieri, Dalla Torre. 



Comparing specimens from Woods Hole and Cuttyhunk 

 Island, Massachusetts, witli those collected by Kobertsou in 



