REPORT OF THE STATE ENTOMOLOGIST IQI7 145 
youncomylA Felt 
1908 Felt, E.P. N.Y. State Mus. Bul. 124, p. 398-99 
1910 Rubsaamen, E. H. Zeitsch. Wissenschaft. Insektenbiol., 15:289 
i911 Felt, E.P. N. Y. Ent. Soc. Jour., 19:53 
1913 Kieffer, J. J. Gen. Insect., fasc. 152, p- 243 
This genus comprises a number of rather large, yellowish or 
srownish species allied to Dicrodiplosis Kieff. and easily distinguished 
herefrom by the greatly produced terminal clasp segment and the 
hickly setose ventral plate and harpes. The male has the flagellate 
wntennal segments trinodose, the distal enlargement being distinctly 
livided, sometimes by an appreciable stem. The palpi are quad- 
articulate. Wings large, rather hairy, the third vein uniting with 
sosta well beyond the apex of the wing, the fifth near the distal 
fourth, its branch near the basal half. The legs are long; claws 
stout, unidentate, the pulvilli being about half as long as the claws. 
The dorsal plate is broadly triangular, the lobes internally with a 
few stout setae; ventral plate long, stout, broadly rounded and 
thickly setose apically, the harpes tapering and thickly setose. Type 
Microdiplosis podophyllae Felt. 
The female has the fifth antennal segment with the stem about 
one-fourth the length of the cylindric basal enlargement, which 
latter has a length about three to four times its diameter. The 
ovipositor is short, stout, the lobes being unusually large and 
orbicular. Rearings show that members of this genus display a 
marked preference for floral buds, Y. umbell icola O.S. and 
Y. vernoniae having been reared, respectively, from the 
blossoms of the elder and ironweed. Another species, Y. quer- 
cina, lives in a subglobular gall on the under side of young leaves 
of the running oak. 
Key to Species 
Males 
a Abdomen reddish brown, the basal and distal portion of the stem of the 
fifth antennal segment with a length two and one-half and twice their 
diameters, respectively, the internal basal lobe of the b asal clasp segment 
quadrate....... Ree) . podophy lar Felt, C. 207 
aa Abdomen dark red, the stems of the fifth antennal segment each with a 
length twice the diameter, the internal basal lobe of the basal clasp 
Pot ia eee Felt, C. 423 
sal and distal stems of the fifth antennal 
and two and one-half times 
basal lobe of the basal clasp 
vernoniae Felt, C7073 
segment triangular.......---- 
aaa Abdomen yellowish brown, the ba 
segment with a length one and one-half 
their diameters, respectively, the internal 
segment rounded apically. .-..--0+---++*" 
