226 Journal New York Entomological Society. [VoI. xx. 



I am under obligations to Mr. E. T. Cresson, Jr., for the loan of 

 tlie material in the Academy of Natural Sciences, Philadelphia ; to 

 Mr. Grossbeck for the American Museum forms ; to Mr. Samuel 

 Henshaw for the especially desired specimens of Brachypremna uni- 

 color from the Loew Collection, now in the Museum of Comparative 

 Zoology, Cambridge ; to Mr. Fred'k Knab for the extensive collec- 

 tions of the U. S. National Museum, collections which contained all 

 of the six species that I have examined; to Dr. J. Chester Bradley 

 for the Cornell University specimens, especially rich in B. dispellens, 

 and to Mr. E. B. Williamson for some very interesting material, 

 collected on the author's recent trip to British Guiana. I express my 

 gratitude to all of the above gentlemen, and to others hereinafter 

 mentioned. 



Characters of the Genus. 



Head: rostrum elongated; nasus distinct, cylindrical, bearing a 

 number of elongated hairs at its apex; maxillary palpi elongated; 

 segments one and two short, subequal ; segment three, half again as 

 long as the second ; last as long as two and three together ; antennas 

 short; first segment cylindrical; second, globular; flagellar segments 

 elongate-ovate, gradually more slender and elongated, bearing scat- 

 tered hairs. 



Thorax : pronotum and collare slender, distinct, so that the head 

 is separated from the mesonotum; legs long and slender, the tarsi 

 almost as long as the femora and tibiae combined; hind tibiae spurred; 

 the fore and middle tibiae apparently spurless. 



Wing venation: Sc long, ending opposite {tinicolor) or beyond 

 the fork of Rs; Rs strongly arcuated at its origin, almost square but 

 not spurred, longest in unicolor, shortest in Candida; R^^^ of varying 

 length, shortest, relatively, in tinicolor, longest, relatively, in Candida; 

 crossvein r long connecting R„^^ at the fork; R very pale, vertical, 

 basal deflection of i?,^^ prominent in all the species excepting 

 unicolor; cross-vein r-m, when present, always short; cross-vein m 

 very long, forming the distal face of cell ist M,; petiole of cell M, 

 moderately long except in unicolor where it is very short ; basal 

 deflection of Cu^ slightly beyond the fork of M, except in unicolor 

 where it is located at, or proximad of, the fork ; fusion of M^ and Cu^ 

 short, almost nil in unicolor, moderate in most species, longest in 



