68 THE CANADIAN ENTOMOLOGIST. 



After Third Moult : Length .28 inch ; color black and dark gray, the 

 sides mottled ; the double dorsal stripe more definite than before ; the 

 spines as before ; head same also. To next moult four days, in May. 



After Fourth Moult: Length .44 inch; color black and gray; the 

 dorsal stripe now solid, dark gray ; the spines black to bases except those 

 of lower row, and on 3 and 4 of middle row, all which have yolk-yellow 

 at base and half way up the stems ; all bristles black ; head brown-black 

 over the front with many black hairs, long and short, the back brownish- 

 yellow. To next moult eight days, in May. 



After Fifth Moult : Length .7 inch ; in about eight days was fully 

 grown. 



Mature Larva. — Length 1.2 to 1.4 inch; slender, somewhat thick- 

 ened in middle, the segments well rounded ; color wholly velvet-black or 

 brown-black (no gray dorsal stripe as before last moult) ; three rows of 

 spines on either side, as in the genus, all of them yellow nearly to tip, the 

 rest black ; feet black, pro-legs brown-yellow ; head sub-cordate, the ver- 

 tices rounded, dull brown in front, dull yellow at back. From fifth moult 

 to pupation 14 days. 



Chrysalis. — Length .9 inch ; breadth across mesonotum .26, across 

 abdomen .23 inch ; like Atlantis in shape, but stouter ; color dark brown 

 over head and wing cases ; so also on the front of each abdominal seg- 

 ment, in serrations, the rest yellow-brown. Duration of this stage ten 

 days, in June 



Hesperis flies in Colorado, Utah and Montana. Mr. Bruce writes 

 me of its habits thus : "Hesperis is by far the most abundant species of 

 the genus along the canons and water courses of the eastern or front range 

 of the Rocky Mtns., in Colorado, at from 6,500 to 8,000 feet elevation. 

 It is very active and restless, and difficult of capture except when on 

 flowers. They are very partial to the bloom of Clematis, and I have fre- 

 quently taken several at one sweep of the net on this plant ; later in the 

 season, on the tall Sunflower. The wild Bergamot and Horse-mint are 

 much frequented by them. They are also fond of alighting on the ground 

 in damp places, especially, late in the summer, when they are worn. I 

 have taken them in Clear Creek and Platte canons from June 16th till end 

 of August. Hesperis is a very pugnacious insect, and will circle round 

 and boldly flap the Lycaenas and Theclas off the blossoms. I was 

 amused one day, on the South Platte, with watching a male Hesperis 



