No. i.] SOME MUSCINAE OF NORTH AMERICA. 



21 



Stomoxys. I have seen but one American species of this 

 genus, which is the well-known "Stable Fly," S. calcitrans L. 

 (Fig. i, wing and chaetotaxy), very common both in Europe and 

 this country. Of the species mentioned in Osten-Sacken's 

 Catalog, dim Desv. and inimica Desv. are varieties of calcitrans ; 

 occidcntis Walk, and parasita Fabr. are expressly stated to have 

 plumose antennae, and must therefore belong to some other 

 genus. As to 5. cybira Walk., Walker himself questions its 

 position in this genus. S. calcitrans L. is a brownish gray fly ; 

 its thorax has three rather broad, whitish stripes ; on each border 



FIG. i. 



of the middle stripe and on the mesal borders of the lateral 

 stripes is a blackish brown line ; abdomen yellowish brown ; on 

 the second, third, and fourth segments are three brown spots 

 which may be faint or even absent ; wings hyaline or tinged 

 with brown at base and along the costa. It has seemed to me 

 that specimens taken on the borders of woods are more likely 

 to have the brownish wings. Antennae brown ; palpi yellowish 

 brown ; legs blackish brown, with yellowish or reddish knees. 



Hacmatobia. - - Two American species are known : H. scr- 

 rata Desv. (Fig. 2 <?), the " Horn Fly," an unpleasant importa- 

 tion from southern Europe, and H. aids. Snow (Fig. 2 b], found 

 by Professor Dyche in the cranberry swamps of northern 

 Minnesota. 



