LIMNGPHILA. 223 



ate ones are approximated. Halteres pale ; the tip sometimes 

 slightly infuscated ; feet brownish-pubescent ; spurs very short. 

 Abdomen grayish-brown ; forceps of the same color. Wings 

 almost hyaline, distinctly broader in the female than in the male ; 

 stigma pale ; first submarginal cell very short, being about equal 

 in length to its petiole ; the latter is gently arcuated, and very 

 long (about four-fifths of the length of the pr&furca) ; the second 

 submarginal cell is very little longer than the first posterior ; the 

 small cross-vein is somewhat oblique ; the discal cell is somewhat 

 elongated, the cross-vein at its inner end is straight ; the petiole 

 of the second posterior cell is usually longer than this cell ; the 

 seventh longitudinal vein is perfectly straight. The marginal 

 cross-vein is a little before the tip of the first longitudinal vein, 

 a little beyond the middle of the stigma ; but as the length of the 

 first submarginal cell is somewhat variable, the marginal cross- 

 vein, which is usually inserted a little before its inner end (that 

 is, between the petiole and the first vein), is sometimes close by 

 this end ; in some specimens even, although rarely, a little beyond 

 it (that is, between the anterior branch of the second vein and 

 the first vein). The position of the great cross-vein is also very 

 variable ; a little beyond the inner end of the discal cell ; or 

 opposite this inner end, or even a little before it. 



Bab. Washington, late in October; Maine (Packard) ; Canada ; 

 the northwestern regions of Hudson's Bay Territory, and also on 

 the Yukon River in Aliaska (Kennicott). 



The forceps of this species (Tab. IY, fig. 24) is distinguished 

 by the great length of the basal pieces, and the comparative 

 smallness of the horny appendages ; this peculiarity is perceptible 

 even in dry specimens. The ovipositor of the female is long, 

 gently curved. The black humeral pits are distinctly perceptible ; 

 but there are no dots on the front part of the mesonotum. 



19. £.. aprilina 0. S. % and J. — Cinerascens, abdomiDe fusco, 

 pedibus testaceis ; alis ad costam six or septern-maculatis ; venis trans- 

 versis nebulosis ; venula transversa supernumeraria in dimidio cellulse 

 basalis secundse. 



Grayisb, abdomen brown ; feet tawny ; wings with six or seven brown 

 spots near the costa ; cross-veins clouded ; a supernumerary cross- vein 

 in the middle of the second basal cell. Long. corp. 0.25. 



Stx. Limnophila aprilina 0. Sacken, Proc. Ac. Nat. Sc. Phil. 1850. p. 235. 



