242 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



(b) The black of the anterior margin of the wing reaches the 

 end of the first subuiargiual cell $ wings remarkably 

 narrowed toward their root, cuneiform ; axillary 

 cell exceedingly narrow, linear; alula obsolete ; the 

 pencil-bearing style of the antenna is as long as the 

 styliform portion of the third joint: 

 *argyropyga Wied., i, 313 (syn. contigua Lw., Cent., 

 viii, 50, female). — Virginia ; Georgia. 

 (bb) The black on the anterior margin of the wing does not 

 cover the end of the marginal cell ; wings broad, 

 with a fully-developed, broad axillary cell and alula ; 

 the pencil-bearing style of the antenna is short, 

 about one-quarter of the length of the very long 

 styliform portion of the third joint : 

 *analis Say, Compl. Wr., ii, 60 (syn. georgica Macq.). — 

 Atlantic States. 

 (aa) Wings black, this color being gradually evanescent posteri- 

 orly ; they are long and comparatively narrow ; the 

 stout basal portion of the third antennal joint is 

 somewhat gradually attenuated, conical, with a 

 short pencil-bearing style. 

 *cephu8 Fabr., Wied., i, 297. — Southern States. 

 III. Hind margins of abdominal segments (especially the second and 

 third) more or less beset with white or whitish scales, 

 forming spots or cross-bands : 

 (a) Basal portion of the wings more or less black ; black spots at the 

 proximal end of the second submarginal, the third 

 posterior, sometimes also the second posterior cells : 

 (b) A hyaline space across the proximal end of the marginal 

 and the distal end of the first basal cells : 

 (c) A brown spot at the proximal end of the second pos- 

 terior cell : 

 Himatulus Say, Com pi. Wr., ii, 354. — Indiana (Say). 

 (cc) No brown spot, etc.: 



*albofasciata Macq., D. E., ii, 1, 67. — Georgia. 

 {bb) No hyaline space across, etc. : 



(d) Distal half of the wings hyaline : 

 *antecedens Walker, Dipt. Saund., 193. — United States. 

 (dd) Distal half of the wings distinctly grayish : 

 *obsoleta Loew, Centur., viii, 47. — Missouri ; Georgia. 

 (aa) Basal portion of the wings black, with numerous black spots 

 in the hyaline portion : 

 *pluto Wied., i, 261.— Kentucky (Wied.). 

 stellans Loew, Centur., viii, 46. — Oregon. 



