154 NEW YORK STATE MUSEUM 
with stems three-fourths and two times their diameters, respectively ; 
trminal segment (fig. 27b), basal enlargement prolonged obpyriform 
the distal strongly divided, the two parts almost separated by a 
short stem, the terminal portion constricted at the base, short, 
subconic. Palpi (fig. 28); the first segment stout, subrectangular, 
the second twice the length of the preceding, the third one-half 
longer than the second, a little more slender, the fourth longer and 
more slender than the third; face dark yellowish brown, eyes large, 
black. Mesonotum dark brown, yellowish red laterally, submedian 
lines narrow, yellowish, sparsely ornamented with pale hairs. Scu- 
tellum rather dark red with fuscous apical hairs, postscutellum 
darker. Abdomen fuscous brown dorsally, the sclerites slightly 
darker than the pleurae and incisures, each segment posteriorly 
with a row of stout, light brown hairs, genitalia reddish brown. 
Wings (pl. 15, fig. 2) subhyaline, costa light brown; halteres yellow- 

Fig. 28 Obolodiplosis robiniae: palpus of male (enlarged, 
original) 
ish transparent basally, reddish fuscous apically. Legs nearly uni- 
form dark straw, lighter ventrally; claws (fig. 27c) strongly curved, 
simple. Genitalia; basal clasp segment short, stout; terminal clasp 
segment swollen at the base and the apical fourth, greatly prolonged. 
Dorsal plate broad, the lobes deeply incised and broadly rounded 
laterally, and somewhat resembling a pair of wings (pl. 17, fig. 2); 
ventral plate apparently divided, the lobes short, subtriangular, 
widely separated; style stout, tapering from the distal third, nar- 
rowly rounded. 
Female. Length 3 mm. Antennae extending to the third 
abdominal segment, sparsely haired, fuscous yellowish; fourteen 
segments, the fifth cylindric, with a stem about one-fourth the length 
