154 



NEW YORK STATE MUSEUM 



with stems three-fourths and two times their diameters, respectively ; 

 trminal segment (fig. 276), 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 (pi. 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 tmi- 

 form dark straw, lighter ventrally; claws (fig. 276') 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 (pi. 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 3^ellowish; fourteen 

 segments, the fifth cylindric, with a stem about one-fourth the length 



