190 THE CANADIAN ENTOMOLOGIST. 



Legs of the Southern specimens similar to M. j?iobilis; the specimens 

 from the Northern and Eastern States and the Rocky Mts. much more 

 black ; the anterior tarsi and larger parts of tibia entirely shining black, 

 but all intermediate colors are to be found ; spurs and sometimes the 

 claws brown. 



Wings similar, variable in size, shape and coloration ; the most 

 striking difference is the hind margin of the hind wings, which is never 

 (in 3c specimens) sinuate in the apical half, but performs a flattened curve, 

 a little more incurved on tip ; the mediana and subcosta are darker and 

 the space between them is blackish, where they are not interrupted with 

 yellowish ; sometimes the transversals below the mediana and some other 

 veins are fumose ; pterostigma white. 



Length of body, 25 to 36 mm.; exp. al., 60 to 76 mm. Breadth of 

 hind wing, 5 to 7 mm. The smallest specimens are from Colorado. 



Habitat. — 30 specimens male and female are before me ; Ludington, 

 Mich., Mr. Pierce (raised); Keene, N. H., Mr. F. H. Foster (raised) ; 

 Peabody, Mass., Mr. G. H. Emerton (raised) ; Albany, N. York (raised 

 by myself); Maryland, Mr. Uhler; Virginia, Alleghany Mts., and Wash- 

 ington, D. C, O. Sacken ; Morganton, N. Carolina, Mr. H. Morrison ; 

 Waco, Texas, Mr. Belfrage ; Denver, Golden City, Manitou, Colorado, 

 by O. Sacken; Wasatch Mts., Utah, Rocky Mts. Dr. Anderson; Lake 

 Tahoe, Cala., O. Sacken ; Sylvania, Cala., Mr. Ricksecker (raised) ; 

 Oregon, Mr. H. Edwards; Washington Terr., Yakima River, Mr. S. 

 Henshaw. 



The imago appears everywhere in J une and July. The larva hyber- 

 nates and transforms in the pupa about May. 



The description and the figure by De Geer, though both not sufficient, 

 proved that his species was the one here described ; there is no N. American 

 species known, which makes this determination doubtful. There can be 

 no doubt that M. melanocephahim Oliv. is the same species. Olivier's 

 specimen was collected by Bose near New York, De Geer's in Pennsyl- 

 vania. Burmeister's type, now before me, is M. mobilis. It would be 

 useless to speak about two species described by Walker, without com- 

 paring his types. The same applies to Prof. Taschenberg's species. 



When I published the Synopsis N. Am. Neur., I knew only three 

 specimens, which are still before me. I had them separated in two 



