116 Journal New York Entomological Society. [Voi. xx. 



sclerite is strong, curved, spur-like, the lower wing strong, spine-like. 

 The infrapharyngeal sclerite is present and distinct, the infrahypos- 

 tomal likewise. The mandibular is enlarged and flattened long-ovate 

 or subelliptical in profile, and the labial sclerite is apparently well 

 developed. The maggot and cephalopharyngeal skeleton are shown 

 in Figs. 224 to 226 of Contr. Th. Knowl. Muse. Flies. 



Type, TD1791 (fly, and slides of maggots and larvipositor). 



Phasiopteryx bilimeki B. B. 



Phasiopteryx sp. (Veracruz), TDi79ia — Ann. E. S. Am., Vol. IV, 

 pp. 136-7. 



One female specimen collected by Herbert Osborn at Orizaba, 

 Veracruz, Jan. 9-16, 1892. This fly is probably Phasiopteryx biliiiicki 

 B. B., as the type of that species came from Orizaba. For purposes 

 of comparison with preceding, and as a contribution to a better knowl- 

 edge of these remarkable forms, I give the description of the first- 

 stage maggots taken from this fly. On same general plan as the 

 maggot of Ph. montana, and color practically same, but differing as 

 follows: Spines of front borders of ventral plates stronger and in 

 double rows. Minute spines broadly massed along median line of 

 venter, the lateral portions of plates bare. Dorsal plates with minute 

 hole-like dots in a marginal row, not showing any definite arrangement 

 by triangles. The lateral plates do not seem to assume the double, 

 free-lying, laminate arrangement natural to Ph. montana; and there 

 are no sharp tubercles or bristles on thirteenth segment, but the very 

 small shortened tubercles each with a very short seta are present just 

 in front of the stigmatal plates. The stigmatal plates are the same, 

 and with the same four peripheral holes in each, but the plates are 

 situated almost terminally on the segment. The twelfth segment has no 

 lateral pointed plates tipped with a bristle. Most extraordinary of all, 

 there are two remarkable talon-clusters or groups of claw-structures 

 just in front of anterior border of third segment, attached to extreme 

 base of second segment and lying one group on each side of the 

 pharyngeal skeleton. Each group consists of an average of seven 

 black, chitinized, tooth-like spines, spurs or short rods, each bearing a 

 strong cat-claw hook, disposed longitudinally side by side, the central 

 one conspicuously larger, the others successively dwindling in size 

 outwardly from the central one. The size of the strongly-hooked 



