ORTALID^S. — ACROSTICTA. 151 



Zeitschr. XI, p. 291, Tab. II, f. 4 ; the figure of the wing is re- 

 produced in the present volume, Tab. IX, f. 4). 



I have not seen any North American Ewpharse yet. 



Gen. V. ACROSTICTA Loew. 



Charact. — Front of an equal, moderate breadth, scrobiculate, rather 



coarsely hairy. 

 Antennce rather short; the third joint elongate-ovate, with a thin, 



bare arista. 

 Face excavated, clypeus projecting. 

 Thorax with bristles on its hind part only ; scutellum convex, with four 



bristles. 

 Wings : posterior angle of the anal cell drawn out in a point ; the last 



section of the fourth longitudinal vein converges towards the third 



longitudinal vein ; posterior crossvein perpendicular ; stigma narrow 



and very long. 



The difference between this genus and the preceding has been 

 mentioned under the head of the latter. The characters which 

 distinguish Acrosticta from Euxesta are : the elongated shape of 

 the third antennal joint, the front, which is marked with pits, the 

 stouter proboscis and the very long, narrow stigma. The picture 

 of the wings resembles that of the species of Seoptera, except 

 that the somewhat turgid front of the latter shows no vestige 

 of pits and the face is not transversely excavated, but carinate. 

 As typical species may be considered either A. scrobiculata Loew 

 (Berl. Ent. Zeitschr. XI, p. 293, Tab. II, f. 5) or A. foveolata 

 Loew (ibid. p. 294), both from Brazil. 



No North American species is as yet known. 



Gen. VI. SEOPTERA Kirby. 



Charact. — Front of equal breadth, somewhat elevated, with very short 



hairs. 

 Antennce rather long, the broad third joint elongate-oval, with a thin, 



bare arista. 

 Face carinate, clypeus projecting. 

 Thorax with bristles on its hind part only ; scutellum convex, with four 



bristles. 

 Wings comparatively long ; the posterior angle of the anal cell pointed ; 



the very long last section of the fourth longitudinal vein converges 



towards the third vein. 

 Feet somewhat longer and more slender than those of the related 



genera. 



