144 NEW YORK STATE MUSEUM 



I can not distinguish the American specimens from those' 

 which I have from Europe. The marks upon the abdomen of 

 the male are quite variable; in some specimens they are simply 

 spots on the posterior lateral margins of the segments, in others 

 they form a broken median dorsal stripe, and in still others they 

 are almost entirely A^anting. The male genitalia in some speci- 

 ments are somewhat brownish. The dark spots upon the wing 

 are arranged as follows: One on the humeral crossvein, one on 

 the discal crossveins, one at the tip of Ri, and one at the tip of 

 R44.5. The paler spots are larger than the darker ones. There 

 is one below the tip of R44.5, one in the middle of cell R4+5, a 

 small one at the tip of the median, and one at the tip of each 

 branch of the cubitus, one or two in the median cell and several 

 in the anal cell. The fork of the cubitus is also clouded. Some 

 of these spots are not always distinct because the color is due 

 to the darker colored hairs, which are easily rubbed off. The 

 wing of the female is usually darker than that of the male. 

 (P1.27, fig.6.) Specimens from New Jersey, Illinois, Ithaca, N. Y., 

 South Dakota. 



Osten Sacken, in a note in his catalogue of the North American 

 Diptera (1878), first calls attention to the fact that T. a n n u- 

 1 a t u s Say and ni o n o 1 i s Linn, may be sj'nonymous. I have 

 compared the North American species, which agree perfectly with 

 Say's descri]»tion, with specimens of m n i 1 i s from Europe, 

 and I can find no differences. For the sake of comparison, Say's 

 description is given below. 



Tanypus annulotus Say 

 Jour. Ac. Nat. Sc. Phil. 3:15. 1823 



Tergum annulate with dusky; wings clouded with dusky and 

 with three or four blackish ])oints. Inhabits Pennsylvania. 



Head and stetliidium red-brown; thorax, the anterior dilated 

 line with a brown line along its middle; feet white, thighs having 

 an annulus near the tij). and tibia with one at base and two near 

 the tip fuscous; wings with large, obsolete, dusky, spots or 

 clouds, and three or four black-brown ])oints. of which two are 

 toward the middle of the wing, and the remainder on the costal 

 margin near Uie tip; tergiim segments Avilh a dusky annulus at 

 their bases. Length about 3/20 in. Male. 



