LIMNOPHILA. 205 



tennae of the male as long or a little longer than the body, slender, 

 filiform ; two basal joints short, the following elongated, cylin- 

 drical, of nearly equal length, clothed with soft, erect hairs ; the 

 third and fourth joints have a small spine on the under side, at 

 the tip ; antennae of the female setaceous, not reaching much 

 beyond the basis of the wing ; joints cylindrical, clothed with 

 sparse hairs ; palpi unusually long, longer than the head ; last 

 joint elongated. Thorax black, shining; pleursB slightly hoary; 

 halteres pale yellow, the knob sometimes infuscated ; feet dark 

 tawny ; coxae and basis of femora paler ; tips of the femora, of 

 the tibiae, and of the tarsi brown. Abdomen black ; three or 

 four intermediate segments with pale ferruginous spots at the 

 basis (more distinct in living specimens) ; genitals ferruginous- 

 yellow. Wings hyaline, spotted with brown ; a spot at the inner 

 end of the basal cells ; a large square one, between the first and 

 fifth longitudinal veins, across the origin of the prtefurca ; a third 

 one between the costa and the discal cell ; the tip of the wing, 

 as well as the cross-veins, is clouded ; petiole of the first sub- 

 marginal cell very short, sometimes almost obsolete ; the second 

 submarginal very little longer than the first posterior cell ; the 

 marginal cross-vein is close at the tip of the first longitudinal vein. 



Hah. United States ; not common. I found male specimen? 

 quite commonly on the 2d of July, 1859, near the so-called Salt- 

 pond, in southern Virginia (about twenty miles from the Mont- 

 gomery White Sulphur Springs). I caught this species in Floridu, 

 in March, 1858. Quebec (Couper) ; Illinois (LeBaron). 



The forceps of the male is like that of the typical LimnoiDhUsp, 

 that is, the two pairs of movable appendages are subparallcl ; 

 the outer one is slender and pointed ; tlie inner one short, stout, 

 with the point turned upwards. (About the subgenus Lasio- 

 niastix, compare p. 199.) 



N. B. — Say commits a mistake when he compares the venation 

 to Meig. I, Tab. Y, tig. Y. Wiedemann quotes correctly Meig. I, 

 Tal. VI, fig. 3. 



2. L. unica, n. sp. 9- — Thorace cinereo, antennis fnsci.s, articnlis 

 basalibus brevibus, rufis ; alis stigmate obscure fusco, prsefurcse basi et 

 venulis traiisversis fusco-nebulosis ; cellulis submargiiiali secundS, et 

 posteriori prima subseque longis. 



Thorax gray, antennae brown, basal joints short, reddish ; wings witli a 

 dark-brown stigma ; brownish clouds at the origin of the prcefurca and 



