REPORT OF THE STATE ENTOMOLOGIST IQI4 279 



Sackenomyia Felt 



1908 Felt, E. P. N. Y. State Mus. Bui. 124, p. 361 



1910 Rubsaamen, E. H. Zeitsch. Wissenschaft. Insektenbiol., 15: 337 



191 1 Felt, E. P. N. Y. Ent. Soc. Jour., 19: 47 

 1913 Kieffer, J. J. Gen. Insect., fasc. 152, p. 48 



This genus is allied to Rhopalomyia from which it is easily sep- 

 arated by the heavily chitinized cultriform distal portion of the 

 ovipositor and the bi- or triarticulate palpi. The antennal segments 

 may vary in number from 12 to 22, being subsessile in the female 

 and with a short stem in the male. The male genitalia of 

 S. packardi are unusually large; the dorsal plate is unique, 

 being broadly rounded and but slightly emarginate, while the ventral 

 plate is long, narrow, deeply and narrowly emarginate, the lobes 

 being long and slender. The type of this genus is Oligotro- 

 phus acerifolius Felt. 



Key to species 



a Length 1 . 5 mm ; abdomen light yellowish 



612 subsessile antennal segments, wings rather narrow 



acerifolia Felt, C. 38 



bb 13-14 antennal segments, fifth of male with a stem as long as the basal 



enlargement, wings rather broad; reared from swollen, purplish leaf veins 



on Viburnum dentatum viburnifolia Felt, C. ai896 



aa Length 2 mm; abdomen yellowish brown; probably 18-22 antennal segments 



porterae Ckll., C. 1252 



aaa Length, female, 3.5 mm, abdomen dark red, 21 antennal segments; male, 



length 2 . 75 mm, antennal segments 22 packardi Felt, C. a 1934 



Sackenomyia acerifolia Felt 



1907 Felt, E. P. N. Y. State Mus. Bui. no, p. 121 (separate, p. 27) (Oli- 

 gotrophus) 



1908 N. Y. State Mus. Bui. 124, p. 361 



This small species was taken at Albany, N. Y., May 17, 1906 

 while sweeping maple and other bushes. 



Female. Length 1.5 mm. Antennae not extending to the base 

 of the abdomen, sparsely haired, light brown; 12 segments, the 

 fifth subsessile, subcylindric, slightly rounded in the middle; terminal 

 segment subconic, broadly rounded. Palpi; the first segment 

 slender, with a length nearly four times its diameter, the second 

 subquadrate, with a length one-half greater than its diameter, the 

 third more than twice the length of the second, tapering, acute. 

 Face yellowish. Mesonotum yellowish brown. Abdomen light 



