90 DIPTERA OF NORTH AMERICA. 



* 



exceedingly broad; frontal bristles black; on the lateral border 

 there are only two, bent anteriorly. Face perpendicular, deeply 

 excavated in the middle, gradually projecting again below. An- 

 tennae yellowish, short, very broad, the third joint having a distinct, 

 though not sharp anterior corner, the bristle with an exceedingly 

 short pubescence. Cheeks rather broad. Opening of the mouth 

 large; proboscis short; palpi very broad and projecting much 

 over the border of the mouth. The short hairs of the thorax are 

 whitish-yellow, the bristles black ; the anterior one of the two pairs 

 of bristles inserted in the middle of the thorax is very near to the 

 suture. Scutellum very convex, with only two bristles. Borer 

 shining black, a little longer than the three last abdominal seg- 

 ments taken together, conical, not flattened at all, a little inflated 

 at the basal half. Femora almost black at the base, further on 

 brown, yellow at the tip; tarsi and tibiae yellow, the latter brown- 

 ish-yellow towards the base. Wings rather broad, covered entirely 

 with a black reticulation ; the drops in it are more numerous, 

 larger, and hyaline on the borders of the wings, much more scarce, 

 smaller, and mostly yellowish-brown in their middle. There are 

 eight short, blackish-brown rays on the portion of the costal bor- 

 der lying beyond the tip of the first longitudinal vein and at the 

 tip of the wing. Between the third and fourth longitudinal veins 

 there is only a single hyaline drop before the small transverse vein. 

 Transverse veins perpendicular; the convexity of the first posterior 

 cell very large and deep, rendering thereby its surroundings rather 

 uneven. 



Hob. Carolina. (Zimmermann.) 



T. melaiiogastra LOEW. $ and . (Tab. II, fig. 23.) Flavo- 

 cinerea, abdomine nigro, capite pedibusque flavis, alis hyalinis, nigro- 

 reticulatis et in apice breviter radiatis, guttis disci paucissiinis, bulla 

 cellulse posterioris primse minima, scutello biseto. 



Yellowish-gray; abdomen black, head and legs yellow; wings hyaline 

 with a black reticulation, short apical rays, few discal limpid drops, and 

 a small convexity in the first posterior cell ; scutellum with two bristles. 

 Long. corp. 0.09 9 0.12. Long. al. 0.12. 



Yellowish-gray, with a black abdomen. Head yellow; front 

 bright yellow, of middle breadth ; frontal bristles brown, but ap- 

 pearing yellow in a reflected light. Face rather narrow, descend- 

 ing straight, excavated in the middle, gradually projecting again 



