148 DIPTERA OP NORTH AMERICA. [PART III. 



tip of the first joint; the other tarsi blackened to a smaller extent. 

 Halteres yellowish-white. Wings rather hyaline, of a dirty 

 whitish tinge ; the second and the next following longitudinal 

 veins, as well as the crossveins which connect them, are black ; 

 the other veins yellowish ; stigma small, of the same coloring as 

 the rest of the wing; the picture of the wing consists of five brown 

 spots with sumewhat paler nuclei ; three of them are in the 

 marginal cell, near the anterior margin : the first, which like the 

 second is oblique, is placed at the tip of the first longitudinal 

 vein ; the last is at the end of the marginal cell ; beyond this is 

 the fourth, a transverse spot in the submarginal cell, immediately 

 under the tip of the second longitudinal vein ; and again under 

 the latter is the last spot, which is rounded and placed in the 

 first posterior cell. The last three spots have the appearance of 

 a narrow', very much shortened transverse band, which appearance 

 is more distinct in those specimens, in which these spots are 

 somewhat larger than usual. The small crossvein is beyond the 

 middle of the discal cell, but before the tip of the first longitudinal 

 vein. 



Hah. Nebraska (Dr. Hayden). 



Gen. III. JfOTOGRAMMA Loew. 



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



Antennae, rather long ; third joint elongated, with a thin, bare arista. 



Face very short, the anterior edge of the mouth very much drawn 

 upwards ; clypeus considerably projecting over it. 



Thorax with bristles on its hind portion only; scutellum flat, with 

 sharp edges. 



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

 half of the last section of the fourth longitudinal vein very much 

 bent forward; posterior crossvein perpendicular; auxiliary vein 

 unusually short, and hence, the narrow stigma very long. 



1. N. Stigma Fab. 9. — (Tab. IX, f. 5.) Nigro-chalybea, thorace 

 lineis alternantibus nigris et lfete virescentibus variegato, alarum limbo 

 costali maculisque parvis nigris. 



Blackish-steelblue, thorax with lines, showing alternately a blackish and 

 a pale-green reflection ; wings with the anterior margin bordered with 

 black, and with small black spots. Long. corp. 0.11—0.16 ; long. al. 0.1. 



Syn. Musca stigma Fabricius, Ent. Syst. Suppl. p. 563, 72. 

 Musca stigma Fabricius. Syst. Antl. p. 303, 96. 

 Dacus obtu>us Fabricius, Syst. Antl. p. 278, 30. 



