REPORT OF THE STATE ENTOMOLOGIST I918 1 39 



1889 Saunders, William Ins. Injtir. to Fruits, p. 239 (Diplosis) 



1908 Felt, E. P. N. Y. State Mus. Bui. 124, p. 408 



1914 Econ. Ent. Jour., 7:458 



191 8 N. Y. State Mus. Bui. 200, p. 168 



This light-brown midge, reared from Phylloxera vasta- 

 t r i X galls, was recorded as very abundant in the vicinity of London, 

 Ontario, in 1882. The larvae and pupae were found in Phylloxera 

 galls, which latter were rather common on Clinton and other grape 

 vines: The eggs are deposited at or near the entrance to the gall. 

 The larva is said to be very active, groping about within the hollow 

 of the gall and devouring the young lice. There were no evidences of 

 the larvae attacking the parent insects, and there was usually an 

 abundance of the young. One or two larvae occur in a gall and in 

 no instance were living Phylloxerae found in association with the 

 pupae — evidence that this Cecidomyiid is a voracious destroyer of 

 this grape pest. 



Male. Length 1.5 mm. Antennae nearly twice the length of the 

 body, thickly haired, light brown; fourteen segments, the fifth with 

 stems each three and one-half times their diameter; distal enlarge- 

 ment subglobose, with a length equal to its diameter; terminal 

 segment, distal enlargement with a length nearly four times its 

 diameter, the apex subacute. Palpi; first segment subquadrate, the 

 second with a length three times its diameter, the third and fourth 

 nearly equal to the second and more slender. Mesonotum yellowish 

 brown. Scutellum and postscutellum lighter. Abdomen light 

 brown. Wings with a length two and one-half times the width, 

 hyaline, costa light brown. Halteres yellowish transparent. Legs 

 pale brown; claws slender, strongly curved, the pul villi a little 

 shorter than the claws. Genitalia; basal clasp segment slender; 

 terminal clasp segment long, slender; dorsal plate deeply and tri- 

 angularly emarginate, the lobes broadly rounded; ventral plate long, 

 broadly rounded; style long. 



Female. Length 2 mm. Antennae nearly as long as the body, 

 sparsely haired, pale yellowish; fourteen segments, the fifth with a 

 stem one-fourth longer than the cylindric basal enlargement, which 

 latter has a length two and one-half times its diameter and is slightly 

 constricted near the middle; terminal segment with a length four 

 times its diameter, narrowly rounded. Palpi; first segment quad- 

 rate, second rectangular, with a length two and one-half times its 

 diameter, the third a little longer, more slender, the fourth a little 

 longer and more dilated than the third. Mesonotum a variable 

 yellowish dark brown. Scutellum yellowish, postscutellum dark 

 brown. Abdomen yellowish brown. Ovipositor short, the terminal 

 lobes with a length nearly twice the width, narrowly rounded. Type 

 Cecid. 962. 



Lestodiplosis yuccae Felt 

 1908 Felt, E. P. N. Y. State Mus. Bui. 124, p. 408 

 1918 N. Y. State Mus. Bui. 200, p. 27 



