TRYPETIDAE. 83 



tinct, but not sharp anterior corner ; bristle of the antennae with a 

 hardly visible pubescence. Opening of the mouth very wide ; 

 palpi and proboscis short. Thorax very convex and broad ; on its 

 upper side in the middle usually a double stripe ending abruptly 

 behind, the posterior part of the lateral stripe and a longitudinal 

 streak above the base of each wing, black. The short hairs of 

 the thorax are whitish yellow, its delicate bristles black. Scutel- 

 lum very convex, quite blunt; the posterior pair of bristles which 

 in most species exists at the tip, is here always wanting so that 

 there is only one bristle on each side near the lateral border ; a 

 second weaker bristle is seldom inserted immediately beside it. 

 Abdomen broad, especially in the male, which has also the last 

 segment a little prolonged and rounded. Borer of the female a 

 little longer than the two last segments taken together, moderately 

 broad, and quite flat, red, blackened at its extremity. Legs rather 

 dirty yellow, femora more brownish. Wings rather large and of 

 more equal breadth than usual. The reticulation of the wings is 

 almost umber brown with small pale brownish drops and hyaline 

 marginal spots very rarely dotted with brown ; the first of these 

 spots is triangular and extends from the posterior border to inside 

 of the discal cells ; the second is much smaller, but also of tri- 

 angular form, and reaches with its tip to the fourth longitudinal 

 vein ; the third forms a margin along the apex of the wing, reach- 

 ing from the tip of the second longitudinal vein to the tip of the 

 fourth longitudinal vein ; the last spot forms a small oblique tri- 

 angle extending from the costal border to the third longitudinal 

 vein, and lying immediately beyond the tip of the first longitudinal 

 vein. A costal spine does not exist. The first longitudinal vein 

 is more hairy than bristly; the transverse veins are perpendicular; 

 the small transverse vein is almost at the end of the second third 

 of the discal cell ; the hind angle of the anal cell has only a short 

 point. 



Hab. New York. (Dr. Fitch.) Washington. (Osten-Sacken.) 

 Observation. — This species has so many peculiarities, that it 

 might easily be considered as the type of a new genus. The broad 

 front, broad and convex thorax, a scutellum having only two bris- 

 tles, the first longitudinal vein alone being hairy, and the absence 

 of the costal spine, would be its most essential characters. 



