232 THE CANADIAN ENTOMOLOGIST. 



Colton, California, by Mr. G. R. Pilate, and were deposited Oct. 21, 

 1888. They hatched March 27, 1889, and the last one hatched June 

 20th, making a total period from egg to imago of 242 days. The food- 

 plant given me by Mr. Pilate was cotton wood or willow. At the time 

 they hatched the willows were just beginning to swell their buds a little. 

 These were given to them and they ate them by boring into them, acting 

 as borers in this stage just as the larvae oi Ilia do in oak buds ; and some 

 of them continued this boring habit till after the second moult, the young 

 leaves at this time being about half an inch long. The fringe along the 

 sides of the larvae places this species near Ilia instead of with some other 

 species that do not have the fringe ; but of this I expect to have some- 

 thing to say in another article. 



SYNOPSIS OF THE NORTH AMERICAN SPECIES OF 



ASTATUS, LATR. 



BY WM. J. FOX, PHILADELPHIA. 

 FEMALES. 



1. Marginal cell as long or longer than the first submarginal (if shorter 



it is scarcely noticeable) 2 



Marginal cell always much shorter than the first submarginal 6 



2. Dorsulum rather strongly and closely punctured 3 



Dorsulum more or less sparsely punctured 5 



3. Entirely black unicolor. 



Abdomen red 4 



4. Pygidial area long, narrow, a little more than twice longer than it is 



broad at the base j stigma of wings black bicolor. 



Pygidial area of a more triangular form, not more than twice longer 

 than its base is broad ; stigma of wings yellowish . . . .pygidialis. 



5. Metanotum with a well-marked, triangular depression at apex; the 



length of the marginal cell is fully equal to the first submarginal ; 



pubescence of thorax white occidentalis. 



Metanotum without a well-marked depression at apex (if present at 

 all it is very faint) 3 the length of the marginal cell is a little 

 less than the first submarginal 3 pubescence of thorax black ; 

 abdomen black or red and black nubeculus. 



