108 NEW YORK STATE MUSEUM 



appear to breed in leaf galls; for instance, L. c o r n i in an ocellate, 

 highly colored, blisterlike gall on the leaves ofCornus alterni- 

 folia; L. vitis inhabits the common tumid leaf or tendril 

 gall on grape, while L. impatientifolia produces a some- 

 what similar gall on the under side of the leaf of the snapdragon 

 (Impatiens fulva). Blackberry leaves frequently have near 

 the base a hard, corky, warty gall caused byL.farinosa. Lasi- 

 optera excavata has a more singular habit, since the larvae 

 occur in a true leaf mine in the foliage of Crataegus. The galls 

 may be monothalamous or polythalamous, some of the latter being 

 inhabited by a considerable number of larvae, as in the case of 

 L. cylindrigallae and L. t u m i f i c a . 



One fossil species, Lasioptera recessa Scudd. 1 has been 

 described from the White river near the Colorado, Utah boundary. 

 The specimen was in such poor condition that this reference can be 

 regarded as tentative only. Scudder's description in connection 

 with his figure of the antennal segments suggests that this species 

 may be referable to Trotteria. 



Key to species 



a Abdomen dark brown 



b Abdomen unicolorous 



c Mesonotum and abdomen fuscous 



d Tarsi dark brown or black, antennal segments, female 1 8 



v e n t r a 1 i s Say 2 

 dd Tarsi a light yellowish basally, antennal segments, female 19. . . . 



portulacae Felt, C. a 2 1 1 3 

 cc Mesonotum and abdomen black, female with 18 antennal segments; 



bred from grass c _ a _ r _b_o n i t e n s Ckll. 



ccc Mesonotum and abdomen dark brown H 



d Tarsi fuscous yellowish. Male with 16 antennal segments; 



reared from Oxybaphus allioniae Felt, C. 2026 



dd Tarsi dark brown, male with 16, female with 19 antennal seg- 

 ments ;_ reared from Pentstemon. ..tibialis Felt, C. 2505 

 bb Abdomen rather thickly clothed dorsally with silvery white scales 



c Antennae and mesonotum dark "brown; male with 16-17 antennal 



segments cinerea Felt, C. 73 



cc Antennae light brown 



d Mesonotum thickly yellow scaled; antennae, female, 22 seg- 

 ments; reared from Solidago ■.' 



argentisquamae Felt, C. ai 568X 



1 1877 Scudder, S. H. U. S. Geol. Geog. Surv. Terr. Bui. 3, p. 745-46; 1890 

 Tert. Ins. N. Am., U. S. Geol. Geog. Surv. Terr. Rep't, 13:600, pi. 5, fig. 29-31. 



2 Location provisional. 



