ORTALIDJ2 — DASYMETOPA. 145 



tinge lies near the anterior side of the second longitudinal vein, 

 below the point of the stigma. The picture of the wings seems 

 to be rather variable, the end of the exterior costal cell being 

 sometimes blackish-brown, sometimes hyaline ; the other dark 

 spots are sometimes faded upon their middle, sometimes also less 

 extended. In a male in the Berlin Museum, the only specimen 

 of that sex which I have seen, the crossband covering both cross- 

 veins is broadly interrupted between them (compare the figure in 

 Monographs, etc., Vol. I, Tab. II, f. 26). At first, I supposed 

 this difference to be a sexual one, but I doubt this now, since I 

 have had an opportunity of ascertaining the great inconstancy of 

 the picture of the wings of the female. 



Hab. Mexico. 



Observation. — The figures given in the Monographs, etc., Yol. 

 I, Tab. II, f. 26, 27, are sufficiently correct as far as the picture 

 of the wing is concerned, but the outline of the wing is not well 

 rendered; they are represented as too broad in proportion to 

 their length. 



SECOND DIVISION. 

 Ortalid^e having the First Longitudinal Yein Bare. 



First Section: Ulidina. 



Gen. I. DASYMETOPA Loew. 



Charact. — Front broad, narrower anteriorly, abundantly hairy on the 



whole surface, the hairs on its sides not longer. 

 Antenna rather short, third joint elongated-oval, with a thin, bare 



arista. 

 Face not excavated, descending vertically ; clypeus projecting over 



the border of the mouth; opening of the mouth not large ; proboscis 



but little thickened. 

 Thorax bristly on its hind part only; scutellum with a rather even 



surface and with four bristles. 

 Wings broader than those of the related genera; stigma of a very 



conspicuous size; posterior crossvein oblique, its anterior end being 



much nearer the apex of the wing than the posterior ; the last 



section of the fourth longitudinal vein is strongly bent forward ; 



the posterior angle of the anal cell is drawn out in a point. 



The general appearance of the species of this genus is very 

 much like that of Trypeta; the coloring of the species at present 

 10 



