306 NORTH AMERICAN TRYPET1NA. 



5O. T. platyptera n. sp. J . Cinerea, abdomine quadrifariam 

 uigro-maculato, capite pedibusque luteis, fetnoribus tamen posterioribus 

 nigro-maculatis, scutello uigro- et flavo-variegato ; alae valde dilatatse, 

 rotundato-ovatae, totae colore nigro guttato-reticulatae, vena longitudinal! 

 tertia uon setosa. 



Gray, abdomen with four rows of black spots, head and feet yellow, the 

 hind femora spotted with black ; scutellum variegated with yellow and 

 black ; wings very broad, rounded-ovate, covered upon their wbole 

 surface with a reticulate black picture ; third vein not bristly. Long, 

 corp. cum terebra 0.21 ; long. al. Q.16. 



Of this species I possess a single badly preserved specimen, 

 and I would not have attempted to -describe it, but for the cir- 

 cumstance that it is distinguished by a number of very peculiar 

 characters, which render its recognition easy, even should the 

 description be imperfect. Head yellowish ; occiput immediately 

 above the point of attachment somewhat blackish ; on each side, 

 near the basis of the antennae, there is, on the border of the eye, 

 a small, almost punctiform, blackish-brown transverse streak. 

 The breadth of the front, which is distinctly narrowed anteriorly, 

 is comparatively considerable, as it equals half the breadth of the 

 head ; the usual frontal bristles are black, those upon the vertical 

 margin are yellowish-white. The third antennal joint is gently 

 excised upon its upper side, and has a rather sharp anterior angle. 

 Cheeks rather broad, with a black bristle, in front of which, along 

 the lateral edge of the mouth, there is some black pile. Oral 

 opening very wide ; its anterior edge is but little drawn up, 

 although rather projecting in the profile. Palpi very broad, 

 reaching beyond the anterior edge of the mouth, beset with black 

 and whitish-yellow hairs. Proboscis short geniculate, with mode- 

 rately prolonged, stout flaps. The thorax of the specimen is 

 greasy, and it is impossible to make any positive statement about 

 its coloring and the pile upon it ; the coloring upon the dorsum 

 seems to have been more blackish; on the sides more brown; the 

 pile seems to have been stubble-shaped, yellowish-white; all the 

 bristles, upon the thoracic dorsum as well as upon the pleura?, are 

 black. The very convex, blackish scutellum has, upon the lateral 

 margins and upon the tip, a broad yellowish border; the four 

 blackish bristles of the scutellum are placed inside of this border 

 upon blackish dots; the pair of those dots which is near the tip, 

 although smaller, is connected with the black coloring of the 



