148 NEW YORK STATE MUSEUM 
segments, the fifth pyriform; the stem one-fourth the length of the 
enlargement, the tenth and eleventh segments fused though sepa- 
rated by a distinct stem. Palpi probably quadriarticulate, stout, the 
first segment subrectangular, slightly swollen distally, the second a 
little longer, rather stout, the third probably longer than the second, 
more slender. Mesonotum dark brown, the submedian lines sparsely 
haired and irregularly tuberculate. Scutellum yellowish brown, 
postscutellum and abdomen fuscous brown, genitalia dark fuscous 
yellowish. Wings hyaline, costa yellowish brown. Halteres yellow- 
ish transparent, legs a variable yellowish or yellowish brown, the 
distal tarsal segments somewhat darker; claws probably simple. 
Genitalia; basal clasp segment rather stout, with a distinct lobe 
basally and tapering to a subtruncate apex; terminal clasp segment 
rather stout at base and tapering to a subacute, thickly setose apex; 
dorsal plate rather long, broad, broadly rounded and thickly setose 
apically ; ventral plate long, slender, subtruncate distally ; style long, 
slender, acute apically. Type Cecid. 1294. 
Tritozyga H. Lw. 
1862 Loew, H. Monog. Dipt. N. Amer., 1:177, 178-79 
1876 Bergenstamm, J. E., & Low, Paul. Syn. Cecidomyidarum, p. 18 
Tees okuse, FB: A: A. Linn: Soc. N.S; Wales Proc, 3:44, 143 
WoO, IGiSitere, M5 Ae Syne (eens Wiese, we Niles, jo, 8S 
1900 ——————- Soc. Ent. Fr. Ann., €9:447—-48 
nO JNGa, 1B, 1s IN; We lia Soe, J@tin, wose2 
This peculiar North American form was made the type of a new 
genus by H. Loew, who refrained from bestowing a specific name 
because of the mutilated condition of the specimen. Through 
the courtesy of Mr Samuel Henshaw it has been possible to study 
the type, now in the Museum of Comparative Zoology at Cam- 
bridge, Mass. This species is more closely related to the author’s 
Microcerata than to any other known genus. It is easily separated 
from Microcerata by the uneven fork of the fourth vein, the pos- 
terior branch being a nearly straight continuation, while the anterior 
branch arises at nearly a right angle and describes a broadly S- 
shaped curve before uniting with the margin. This character alone 
suffices to distinguish it from all other Itonididae. The fourth, 
fifth and sixth veins are distinctly heavier than in Microcerata, the 
last having a somewhat sinuous course. The antennae are com- 
posed of but 9 segments, the second being somewhat enlarged and 
the terminal segment, evidently composed of 3 rather closely fused, 
distinctly produced and with a length fully six times its diameter. 
The palpi are plainly stouter than in Microcerata. 

