12 DIPTERA OF NORTH AMERICA. 



with short black hairs and black bristles on the posterior borders 

 of the two last segments ; the last segment has a dot-like black 

 spot on each side near the base. Borer short, thick, not flattened 

 at all, a little rounded at its end, of the color of the abdomen, 

 and covered with black hairs. Legs yellowish ; anterior femora 

 with black bristles on their under side ; the under side of the 

 middle and posterior femora with some black bristles only near 

 the tip, the bristles being shorter on the middle femora; the pos- 

 terior tibia3 on their whole upper side are densely fringed with 

 rather long black bristles, which afford a very characteristic mark 

 of this species. Wings hyaline, with brown bands. The first of 

 these bands is the least regular, and runs from the transverse 

 humeral vein as far as the end, of the anal cell, the posterior angle 

 of which is drawn out into a long point; this anal cell, as well as 

 the basal cell lying before it, is brownish-yellow. The second 

 band, beginning with the short stigma, runs over the small trans- 

 verse vein, and, after crossing the discal cell, reaches the posterior 

 border, on which it is connected more or less distinctly with the 

 posterior end of the following band. The latter begins on the 

 costal border before the tip of the second longitudinal vein, and 

 after running over the posterior transverse vein in a straight direc- 

 tion, reaches the posterior border of the wing. Its anterior end is 

 perfectly connected with the last band, which seams the wing as 

 far as a little beyond the tip of the fourth longitudinal vein. Be- 

 tween the second and third bands there is still a yellowish-brown 

 line drawn perpendicularly from the costal border to the third 

 longitudinal vein. Transverse veins straight; the small transverse 

 vein is a little beyond the middle of the discal cell. 

 Hab. Florida. (Osten-Sacken.) 



1. T. insecta Loew. 9. (Tab. II, fig. S.) — Thorace nigro, capite, 

 abdomiue pedibusque luteis, alarum nigrarurn incisuris marginalibus 

 guttulisque inter venarum longitudinalium tertiam et quartam tribus 

 vel quatuor pellucidis, vena longitudinali tertia, nuda, setis -scutelli 

 duabus. 



Thorax black ; head, abdomen, and legs luteous ; wings black, with limpid 

 incisions on the borders, and three or four limpid drops between the 

 third and fourth longitudinal veins ; third longitudinal vein bare ; 

 scutellum with two bristles. Long. corp. 0.14. Long. al. 0.14. 



Of the group of the European Tryp. rotundiventris Fall. Head 

 dirty yellow. Front rather narrow, more so towards its anterior 



