144 NEW YORK STATi: MUSKI'M 



1 can not distinguish tin- American specimens from those 

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

 the male are quite variable; in sonic specimens 1 he y are simply 

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

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

 are almost entirely wanting. The male geiiitalia 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 crossvcins. one at the tip of R,, and one at the tip of 

 R 4 4. v The paler spois are larger than the darker ones. There 

 is one below the tip of R 4 + ,, one in the middle of cell K 4 + , a 

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

 branch of the cubit us. one or two in the median cell and several 

 in the anal cell. The fork of the cubilus 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 oil'. The 

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

 I I'l.-T, fig.G.) Specimens from New .Jersey, Illinois, Ithaca, N. Y., 

 South Dakota. 



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

 Diptera (isTSi. first calls attention to the fact that T. a n n u- 

 1 a t u s Say and m o n o 1 i s Linn, may be synonymous. I have 

 compared the North American species, which agree perfectly with 

 Say's description, with specimens of monilis from Europe, 

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

 description is given below. 



TIIHI/IIHS (innitlatH* Say 

 Jour. Ac. Nat. Se. Phil. 3:15. 1S'_':: 



Tergnm annulate Avith dusky; wings clouded with dusky and 

 with three or four blackish points. Inhabits Pennsylvania. 



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

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

 an anmilus near the tip. 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 points, of which two are 

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

 margin near the tip; tergum segments with a dusky annulus at 

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



