THE CANADIAN ENTOMOLOGIST. 21 9 



apical part of the wing is a triangular white costal streak pointing obliquely 

 forwards and ending in a small violaceous metallic spot. There are thus 

 seven costal spots (including the one on the base), and two dorsal ones, 

 the second dorsal being very small and white, and pointing to the infra- 

 dorsal violaceous spot. Cilise fuscous, with a white line extending along 

 the base of those of the dorsal margin. Hind wings purplish fuscous 

 with long white ciliae. Under surface of both pair purplish fuscous, with 

 the three white costal streaks which are nearest to the apex showing 

 through the wing. Upper surface of the abdomen shining black, each 

 segment margined posteriorly with white ; under surface silvery white, each 

 segment narrowly margined anteriorly with black • anal tuft silvery white. 

 Al. ex. 5 lines. Edgerton, Colorado ; alt. over 6,ooo feet. 



The imago may be found in the afternoon in July, flitting about in the 

 brilliant sunlight of that region, and alighting on the grass, or on the stalks 

 of Abrofiia fragrans, which is very abundant, filling the air with its rich 

 and delicate, though to me somewhat sickening, fragrance. (The state- 

 ment in Prof. Gray's " School and Field Book of Botany," that the 

 flowers of A. fragrans ' open at sunset ' is incorrect, so far as I observed 

 the species, as I have usually found the flowers fully open at all hours of 

 the day. It is, however, more fragrant in the afternoon and evening, but 

 I have never found the flowers frequented by any insect, otherwise than 

 by an occasional visit from a small Andrena.) I never saw the species 

 just described upon or in the flowers at any time. The larva resembles 

 that of a Glyphipteryx, and mines the leaves of the Abronia, as I am fully 

 convinced, though I did not succeed in rearing it, as all my specimens 

 died after becoming pupae. The moth and its larva are quite common. 

 In twenty-five captured specimens I find no variation. The mine is 

 irregular in shape, and the frass is ejected usually from the under side 

 of the leaf, and sometimes there is a slight web on the outside of the 

 leaf. It frequently abandons its old mine and constructs a new one, and 

 once in confinement a well grown larva sewed two leaves together and fed 

 upon them, though I never knew it to feed in this manner except in the 

 breeding jar. It spins its cocoon in the sand. It is one of the prettiest 

 of our ' Micros.' 



BLASTOBASIS, Zell. 



(holcocera, Clem). 

 B. giga?itella. N. sp. 

 White ; microscopically dusted with fuscous scales, and the course of 



