I90 NEW YORK STATE MUSEUM 



Carpinus americana, and may possibily be identical with 

 Cecidomyia pudibunda O. S., the larvae of which live in 

 the folds of beech leaves. 



LASIOPTERYX 

 Key to species 



a Antennae with 10 to 12 segments, the fifth of the male with a stem 



three-quarters the length of the basal enlargement, the ovipositor 



long 



b Abdomen yellowish red ; female antennae with 10, male antennae with 



11 segments, the ovipositor one-third the length of the abdomen 



flavotibialis Felt, C. ai454 

 bb Abdomen reddish brown ; antennal segments 12, the ovipositor as 



long or longer than the abdomen schwarzi Felt, C. a2i77 



aa Antennae with 13 or 14 segments, the ovipositor short 



b Fifth antennal segment of the male with a stem one-half the 



length of the subcylindric basal enlargement 



c Wings broad, the fourth palpal segment one-half longer than 



the third 



d Antennae of the male half the length of the body, the 



fifth segment having the basal enlargement with a length 



twice its diameter, that of the female with a length two 



and one-half times its diameter 



arizonensis n. sp., C. a2o63 

 dd Antennae of the male with a length nearly that of the body, 

 the fifth having the basal enlargement with a length one- 

 half greater than its diameter, that of the female with 



a length twice its diameter. Reared from Cassava 



m a n i h o t Felt. 



cc Wings narrow ; female antennae slender, the fifth segment with 



a length three times its diameter, the fourth palpal segment 



one-quarter longer than the third carpini Felt, C. 346 



bb Fifth antennal segment with a stem as long as the basal enlarge- 

 ment, circumfili greatly and irregularly produced in the male 



c ory 1 i Felt, C. ai543 



Lasiopteryx flavotibialis Felt 



1907 Felt, E. P. N. Y. State Mus. Bui. no, p. 157-58 (Dasyneura) 

 1908 N. Y. State Mus. Bui. 124, p. 341 (Dasyneura) 



This striking and interesting form is at once recognized by the 

 subhyaline and brilliantly iridescent wings, due to the numerous 

 dark broad scales and the yellowish tibiae. The presence of well- 

 developed circumfili prevent its reference to the Heteropezinae, 

 while the distinctly petiolate antennae of the male prohibit its asso- 

 ciation with Lasioptera, despite the numerous scales occurring upon 

 both wings and body. This species is easily distinguished by the 

 11 and 10 segments of the male and female respectively, in con- 



