148 NEW YORK STATE MUSEUM 



an irregular brown mark, composed principally of two median 

 vittae and a posterior arcuate fascia, most distinct on the median 

 segments, on the apical ones expanded so as to cover nearly the 

 entire dorsum; hairs of antennae mixed pale yellow and brown, 

 their apices chiefly whitish, mesonotum opaque, whitish piiiinose; 

 in certain lights three dark yellow vittae are visible; front tarsi 

 clothed with very short hairs, the first joint two-thirds as long 

 as the tibia; wings whitish hyaline, almost wholly covered with 

 yellow hairs, humeral crossvein bordered with brown, a broad 

 pale brownish fascia crosses the wing just before the small cross- 

 vein, and a second slightly broader one at apex of R^, cubitus fork- 

 ing a short distance before the small crossvein; length 3.5 mm. 



Female. Differs from the male as follows : Abdomen with 

 dark yellow mottlings, destitute of brown markings, hairs of 

 antennae whitish, vittae of mesonotum more distinct; length 3 

 mm. Riverton N. J. 



12. Ablabesmyia ornata Meigen 



1838 T any pus Meig. Syst. Bescbr. 14, 7:31 

 1864 T a n y p u s Schiner. Fauna Austi*. 2 :620 

 1877 T a n y p u s V. d Wulp. Dipt. Neeii. p.304 



Male. Pale yellow; the antenna and its hairs of the male 

 pale brown. Thorax with three deeper yellow stripes; the two 

 lateral ones bounded anteriorly by a fine brown or black line, 

 which is continued over the pleura to the base of the wing; meta- 

 notum brownish. Abdomen with slightly darkened incisures; the 

 last segments of the male brownish yellow; claspers yellowish, 

 quite stout. Legs whitish; near the apex of the femur a brownish 

 ring; the tips of the tibiae slightly browned; fore metatarsus a 

 little shorter than the tibia ; fore tarsi of the male slightly ciliate. 

 Halteres white. Wings hairy, pale yellow, with two cross bands 

 and a dark spot at the anterior margin a short distance from the 

 tip; the crossveins blackish bordered; the venation as usual. 

 Ivength .^.5 mm. 



Var. a. female. Differs from the above in having the abdomen 

 with mottled dark brown irregular fascia on each segment. The 

 fore metatarsus about three-fourths as long as its tibia. 



Var, h. female. Difl'ers from the typical form in having three 

 distinct, ojiaque. ferruginous thoracic stripes, humeri white, an- 

 terior margin of Ihe dorsum narrowly blackened; no blackish 

 pleural spots; metanotumi and sides of scutellum ferruginous or 

 brownish. Abdomen brown, segments with paler posterior mar- 

 gins. The brown clouds on the wings so coalesce that the wings 

 may be described as having two wide, irregular cross bands, one 

 before the middle and one between the middle and the tip; cross- 

 veins almost black. Several specimens, Tthaca. N. Y. 



