104 DIPTERA OF NORTH AMERICA. [PART III. 



diate vicinity of the small crossvein the coloring of the wing is 

 more ferruginous-brown than black, which is especially perceptible 

 by transmitted light ; specimens also occur which have other 

 pale streaks in one or the other of the cells. 



Hob. Northern Wisconsin River (Kennicott) ; Illinois (H. 

 Shimer). 1 



Observation. "Wiedemann probably prepared his description 

 of Trypeta flexa from a very imperfectly colored specimen. A 

 drawing of the wing, which I prepared some twenty years ago 

 after an original specimen in the Berlin Museum, proves conclu- 

 sively that Trypeta flexa is distinct from Tritoxa incurva and 

 cuneata. The former is proved by the dark coloring at the tip 

 of the wing having a much greater extent than in T. incurva, 

 and by the course of the third crossband in T. flexa, which is 

 not arcuated towards its end, but almost straight ; in T. cuneata 

 the different shape of the wing and the entirely distinct delinea- 

 tion of the crossbands altogether exclude the possibility of its 

 synonymy with T. flexa. The figure of the wing drawn by me 

 and above alluded to agrees with the present species so well that 

 I consider my opinion about the identification of this species as 

 well founded. Should this not be the case, then T. flexa Wied. 

 is a species which I do not possess. The statement of Wiede- 

 mann, that the ovipositor of the female is two jointed, rests upon 

 an error, which is easily explained away by the resemblance 

 of the first joint with the preceding abdominal segment. That 

 Walker's Trypeta arcuata is synonymous with the present spe- 

 cies is not in the least doubtful, although in the figure of the 

 head the arista is made too short and its pubescence too long. 



2. T. incurva n. sp. $ 9. (Tab. VIII, f. 12.) Badia, abdomine 

 nigro; alse fuscae, fasciis hyalinis modice angustis, secnnda et tertia 

 arcnatis, hac ab alse apice minus latequam in speciebus reliquis remota, 

 vena transversa posteriore obliqna. 



Reddish chestnut-brown, with a black abdomen ; the wings brown, with 



1 Mr. H. Shimer, from Mt. Carroll, 111., informed me, in 1865, that this 

 fly is very injurious to onion - plants, the larva occurring in the bulb. 

 This fact has, since then, been mentioned in the Practical Entomologist, I, 

 p. 4; II, p. 64 (with figures of larva and imago) ; American Entomolo- 

 pist, II, p. 110. Specimens of Tritoxa incurva were found by Mr. Shimer, 

 together with T. flexa, and taken for a mere variety of that species. 



0. S. 



