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 ; antennas 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; pleurae 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 praefurca ; 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. 



Hab. United States ; not common. I found male specimens 

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

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

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

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



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

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

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

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

 mastix, compare p. 199.) 



1ST. B. — Say commits a mistake when he compares the venation 

 to Meig. I, Tab. Y, fig. 1. Wiedemann quotes correctly Meig. I, 

 TaV VI, fig. 3. 



2. L. unica, n. sp. 9.— Thorace cinereo, antennis fnscis, articulis 

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

 venulis transversis fusco-nebulosis ; cellulis submarginali secund& et 

 posteriori prima subseque longis. 



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

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



