THE DIPTEKOUS GENUS DOLICHOPUS IN NORTH AMERICA. 213 



fourths as long as second and the wing has no sinus betweem the tip 

 of sixth vein and the anal angle, while in seratus the third joint is 

 only about one-fourth as long as second and there is quite a dis- 

 tinct sinus between the tip of sixth vein and the anal angle, ^ratus 

 agrees with completus in the form of the wing at the anal angle, but 

 differs in having the first two joints of fore tarsi equal, while in 

 completus the second is only three-fourths as long as first, the third 

 is also longer in this, being half as long as second, while in seraius 

 it is scarcely one-fourth as long as second. The female of seratus 

 differs from that of completus in having the first joint of fore tarsi 

 as long as the three following together, while in completus the first 

 joint is scarcely as long as the two following together. The female 

 of procerus differs from that of completus only in being more shining. 

 It is also more shining than that of seratus. 



No. 153. DOLICHOPUS SUFFLAVUS, new species. 



Male. — Length 5 mm. ; of wing the same. Face wide, a little nar- 

 rowed below, yellow to grayish yellow. Front green, with bronze 

 reflections. First antennal joint yellow; second and third joints 

 black, the latter about as long as wide, somewhat orbicular in outline. 

 Lateral and inferior orbital cilia pale yellow, about seven of the upper 

 cilia on each side black. 



Thorax dark green, usually with bronze reflections, which form two 

 narrow vittae on the dorsum, the anterior portion of which is a little 

 dulled with gray pollen; pleurae with grayish white pollen. Abdo- 

 men dark green with slight bronze reflections on the hind margins of 

 the segments ; the white pollen on its sides mostly confined to the lower 

 edges. Hypopygium black ; its lamellae rather large, somewhat oval, 

 twice as long as wide, yellowish or yellowish brown, shading into a 

 broad black border at apex, sometimes they are more whitish; they 

 ^1*6 jagged and bristly on apical margin, fringed above with little 

 black hairs, below with pale hairs. 



Fore coxae yellow, blackened a little at base, their anterior surface 

 covered with black hairs, those along the outer edge unusually long. 

 Middle and hind coxae black with yellow tips. Femora and tibiae 

 yellow. Mddle and hind femora each with one preapical bristle, the 

 latter without cilia below, the black hairs on the sides reaching the 

 lower edge. Posterior tibiae slightly thickened, the glabrous stripe 

 on upper surface rather broad but somewhat broken by little hairs. 

 Fore tarsi (fig. 153a) nearly one and a third times as long as their 

 tibiae, first joint longer than the three following taken together, with 

 a row of minute bristles below, second joint about one-third as long 

 as first, third and fourth together about as long as second, slightly 

 widened, fourth shorter than third, scarcely as long as wide; fiist 

 three joints yellow, still sometimes quite infuscated, fourth more or 

 less black; fifth joint deep black, much compressed, a little shorter 



