214 DIPTERA OF NORTH AMERICA. [PART IV. 



Front grayish ; palpi infuscated ; rostrum yellowish ; antennae 

 brown ; basis of the third joint pale ; joints of the flagellurn 

 elongated-elliptical ; verticils moderate. Thorax brownish-yel- 

 low with two pale brown stripes, which become paler near the 

 collare, where they communicate with a brown spot near the 

 humerus ; they extend beyond the suture posteriorly ; pleurae 

 pale, sometimes with a pale brown stripe ; halteres pale, slightly 

 infuscated ; feet pale tawny, tips slightly infuscated. Abdomen 

 brownish ; ovipositor arcuated, of moderate length. Wings 

 slightly tinged with grayish ; stigma faintly infuscated ; marginal 

 cross-vein at the tip of the first longitudinal vein ; praefurca gently 

 arcuated, rather short, not longer than the petiole of the first sub- 

 marginal cell ; this petiole is conspicuously arcuated ; the branches 

 of the second vein are nearly parallel, except at the basis ; the 

 second submarginal cell is only a trifle longer than the first pos- 

 terior ; the second posterior cell rather long, in comparison to its 

 petiole (the relation between them is variable) ; the great cross- 

 vein is usually opposite the middle of the discal cell. 



Bah. Trenton Falls, K Y. 



This species is easily distinguished by the arcuated petiole 

 of its first submarginal cell. 



11* L*. areolata 0. S. % and £. — Ochracea; alse subhyalinse, im- 

 maculatse ; cellula discoidali elongata ; ejus angulus interior et prse- 

 furca? initium ab alse basi fere seque distantes ; cellulse submarginalis 

 secunda et posterior prima longissimse ; prsefurca brevis. 



Ocbraceous ; wings subhyaline, immaculate ; discal cell elongated ; its 

 inner end not much more distant from the basis of the wing than the 

 origin of the prsefurca ; the second submarginal and the first posterior 

 cells are very long ; prsefurca short. Long. corp. 0.27 — 0.32. 



Syn. Limnophila areolata 0. Sacken, Proc. Ac. Nat. Sc. Phil. 1859, p. 237. 



Ochraceous yellow, antennas, except the basal joint, slightly 

 infuscated ; front sometimes with a yellowish-gray bloom ; knob 

 of the halteres more or less infuscated ; abdomen brownish above, 

 venter pale ; forceps ochraceous ; ovipositor long, slender, very 

 slightly curved ; feet yellowish, the latter part of the tibiaa and 

 the tarsi, except at the basis, brownish ; sometimes the tibiae are 

 altogether yellowish. The antennae, if bent backwards, would 

 not reach much beyond the root of the wings ; the joints of the 

 flagellum are about twice longer than broad, gradually becoming 



