l60 NEW YORK STATE MUSEUM 



Gall. Length and diameter about 2.5 cm. An irregular, sub- 

 globose or fusiform enlargement of the stem near the ground and 

 almost invariably eccentric. The surface is usually somewhat 

 roughened, hard, while the softer, pithy interior is inhabited by 

 numerous larvae. 



Larva. Length 3.5 mm, slender, pale yellowish gray. Head long, 

 slender, tapering gradually to a narrowly rounded apex. Antennae 

 stout, tapering, with a length two and one-half times the diameter. 

 Breastbone stout, heavily chitinized, tridentate, the median tooth 

 small, sometimes almost obsolete and about one-third the length 

 of the heavy submedian, rather slender teeth; terminal segment 

 broadly rounded posteriorly. 



Male. With 17 antennal segments, the fifth with a length about 

 one-half greater than its diameter, the fourth palpal segment one- 

 half longer and more slender than the third ; the pulvilli are shorter 

 than the claws. Genitalia, basal clasp segment long, slender; ter- 

 minal clasp segment swollen basally; dorsal plate short, broad, 

 deeply and triangularly incised, the lobes widely separated, nar- 

 rowly rounded distally; ventral plate long, tapering, narrowly 

 rounded. Harpes long, slender, tapering; obtuse. Style a little 

 longer, slender, broadly rounded. 



Female. With 19 to 22 antennal segments, the fifth with a length 

 about equal to its diameter; terminal segment slightly prolonged, 

 narrowly oval. The wing is illustrated on plate 5, figure 2. Ovi- 

 positor nearly as long as the abdomen, the terminal lobes with a 

 length four times their diameter, slender and with a sparse group 

 of short, stout, lance-shaped scales and five or six stout, chitinous 

 hooks. 



Lasioptera ziziae Felt 



1908 Felt, E. P. N. Y. State Mus. Bui. 124, p. 327 



This midge was reared in April 1908 from a fusiform stem gall 

 on golden Alexanders, Zizia aurea, collected by Mr L. H. 

 Weld at Evanston, 111. 



Gall. A fusiform stem swelling some 3 cm in length and .6 cm in 

 diameter. 



Larva. Length 3 mm, pale orange, rather stout. Head small, 

 antennae slender, tapering; breastbone slender, distinctly expanded 

 apically, bidentate, the teeth unusually long and between a minute 

 median tooth ; skin coarsely shagreened ; posterior extremity broadly 

 rounded. 



Male. Length 2 mm. Antennae fuscous yellowish, fuscous 

 basally; 16 segments, the fifth with a length one-fourth greater 

 than its diameter; terminal segment produced, with a length one- 

 half greater than its diameter, broadly rounded apically. Palpi; 

 the first segment short, stout, irregular, the second narrowly oval, 

 the third a little longer, more slender, the fourth one-half longer 

 and more slender than the second. Mesonotum dark brown, thickly 

 yellow -haired, the submedian lines with long, yellowish setae. 



