98 DIPTERA OP NORTH AMERICA. [PART III. 



their brownish-black picture consists of a narrow border alon' 

 the anterior margin, which reaches from the end of the auxiliary 

 vein to that of the fourth longitudinal vein, in the darker coloring 

 of the first basal cell, which even crosses a little the small cross- 

 vein and in a narrow border along the posterior crossvein. 



Hab. Texas (Belfrage). 



Observation 1. The South American S. brevipes Fab. is dis- 

 tinguished from the present species by the ochre-yellow color of 

 the humeri and the ferruginous-yellowish color of the halteres. 



Observation 2. Herina metallica Macq. (Dipt. Exot. II, 3, 

 p. 208), from Mexico, is evidently no Herina at all, but a Sten- 

 opterina. It would seem possible, therefore, that Stenopterina 

 cserulescens is that very species. Many of the statements in 

 Macquart's description agree with S. cserulescens. It must be 

 borne in mind, however, that these statements refer for the most 

 part to characters which a whole series of Stenopterinee have in 

 common. The statement that the wings are yellowish is not 

 applicable to S. cserulescens, and none of the varieties of this 

 species which are in my possession have the black feet mentioned 

 in Macquart's description of H. metallica. Nevertheless, I 

 would not have doubted this synonymy if I had nothing but 

 Macquart's description to consult. The figure of the wing, how- 

 ever, which Macquart gives (1. c. Tab. XXIX, f. 2) sets this 

 supposition entirely aside, by showing an unusually broad dark 

 border along the anterior margin, by which Macquart's species 

 differs conspicuously from .S. cserulescens and similar species 

 with the ordinary narrow border of the anterior margin. 



Gen. V. HIISCnOG ASTER MACQ. 



Charact, Front of a considerable, rather equal, breadth ; the anterior 

 ocellus rather distant from the two others. 



Face excavated in profile, hardly projecting below. 



Antennae rather long ; arista with a distinct pubescence. 



Wings narrowed towards the basis ; auxiliary and first longitudinal 

 veins closely approximated ; posterior angle of the anal cell 

 rounded. 



Abdomen narrow, still more attenuated towards the basis ; first seg- 

 ment beset with strong bristles ; ovipositor rather conical. 



The characters, as given here, are very incomplete, and 

 require an entire revision. Unfortunately, I had no specimen at 



