224 NEW YORK STATE MUSEUM 



Gall. The gall on Aster laterif lorus producing this form, 

 is round, about 3 mm in diameter and with a dark center encircled 

 by a white ring, the portions of the leaf adjacent being more or less 

 suffused. The gall on what we take to be Aster 1 a e v i s , is 

 oval, 4 to 6 mm in diameter, yellowish white and dark margined. 

 For a colored illustration see Museum Bulletin 175, plate 2, figure 5. 



Female. Length 2 mm. Antennae brown, basally fuscous yellow- 

 ish; 18 segments, the fifth with a length three-fourths its diameter; 

 terminal segment partly fused with the preceding, somewhat pro- 

 longed, narrowly rounded. Palpi; the first segment short, stout, 

 subquadrate, the second twice the length of the first, irregularly 

 subfusiform. Face with a white patch of silvery white scales. 

 Mesonotum black, sparsely margined laterally with silvery white. 

 Scutellum nearly the same color as the mesonotum. Abdomen 

 black, the incisures dark reddish, each segment sparsely margined 

 posteriorly with silvery white, the venter a uniform silvery gray. 

 Wings (pi. 5, fig. 9) hyaline, costa dark brown, the third vein uniting 

 with costa at the basal half; halteres pale. Legs black, coxae, 

 the extreme base of the femora and articulations of the tibiae more 

 or less pale; claws rather long, strongly curved, the pulvilli as long 

 as the claws. Ovipositor about one-half the length of the abdomen, 

 the terminal lobes short, broadly oval. 



Male. Antennal segments 16, the fifth with a length three- 

 fourths its diameter; the abdomen and the legs a uniform dark brown, 

 the venter pale yellowish; otherwise as in the female. The char- 

 acters of the male are from the type. Cecid. aisso. 



Asteromyia agrostis 0. S. 



1847 Fitch, Asa. N. Y. State Agric. Soc. Trans., 6:351-52 



1862 Osten Sacken, C. R. Dipt. N.- Am. Mon., 1:204 (Cecidomyia 



agrostis) 

 1893 Marten, John. Ohio Agric. Exp't Sta. Techn. ser. 1, no. 3, p. 155-56 



(Lasioptera muhlenbergiae) 

 1893 Webster, F. M. Ohio Agric. Exp't Sta. Techn. ser. 1, no. 3, p. 154-55 



(Lasioptera muhlenbergiae) 

 1902 Cockerell, T. D. A. Can. Ent., 34:183 (Lasioptera carbon i- 



t e n s) 



1908 Felt, E. P. N. Y. State Mus. Bui. 1-24, p. 329 (B. muhlenbergiae) 



1909 Jarvis, T. D. Ent. Soc. Ont., 39th Rep't, p. 85 (B. muhlen- 



bergiae) 



The gall and pupa of this species were described by Fitch without 

 a name in 1847. Later Osten Sacken proposed the scientific name 

 for this form, which breeds in a prolonged, fusiform enlargement 

 at the basal portion of the stem of Muhlenbergia mexicana. 

 Lasioptera carbonitens Ckll. is probably a synonym. 

 Polygnotus species was reared from this gall. The species breeds 

 in a prolonged, fusiform enlargement at the basal portion of the 



