218 JOHN B. SMITH. 



untufted. Primaries moderate or rather large, varying somewhat 

 in width, costal and inner margin shouldered, then subparallel or 

 gently curved, apex rectangular, hind angle obtusely rounded ; vena- 

 tion normal, veins 7, 8 and 9 on one stalk out of the end of the 

 accessory cell ; 7 branches at less than one quarter the distance to 

 the margin, 8 and 9 diverge at about one half way between cell 

 and apex. Secondaries proportionate, vein 5 as strong as the others, 

 out of the weak cross vein at about one third the width of the cell. 



The species are very similar in appearance and type of macula- 

 tion. The primaries have no transverse maculation, except a punc- 

 tiform or fasciform t. p. line; there is a tendency to form a longitu- 

 dinal shading through the middle, usually accompanied by the loss 

 of the transverse marking ; the ordinary spots are reduced to small 

 dots and one or both may be entirely wanting. In color the range is 

 from snowy white through creamy yellow to smoky brown or blackish. 



Stygialis is the largest and darkest form, the color being a uniform 

 smoky blackish on both wings, the maculation a black, diffuse 

 streak through the centre of the primaries. The species is from 

 Southern Arizona, and has an unusual admixture of flat hair in the 

 thoracic vestiture, as well as a better developed tongue than the 

 other species. 



Strigata has the same longitudinal maculation, but is creamy 

 white in color, with smoky powdering. The tongue is here decidedly 

 weak, but is longer in the female than it is in the male. 



Bipuncta is a broad winged species, almost as large as stygialis, 

 and the only one in which there is a complete band at the place of 

 the t. p. line ; this band varies much in distinctness, but seems to be 

 always present and is often well marked. In color the primaries 

 range from creamy to smoky gray, the difference being mostly due 

 to the variable number of smoky atoms powdered over the light 

 base. 



Obscura Grt. belongs here and differs in its somewhat larger size, 

 much darker color and less obvious t. p. line. 



Nivealis has the wing form of the preceding; but the primaries 

 are white, immaculate, except for a gray dot on the cross vein at 

 the end of the- cell. 



Humeralis is narrower winged, with the shoulder of costa and 

 inner margin of primaries well marked. The color is creamy yel- 

 low, powdery, and tends to become brown or smoky at the outer 



