16 HARVEST MITES. 
with a great racket they all rose together like a flock of blackbirds 
and returned to their haunts among the cedars far up the canon. 
For some time a pair of mallard ducks had been circling about as 
though looking for a place to alight, and finally they selected a 
bend in the creek just in front of me. Above the ridge beyond 
the creek, a turkey buzzard was floating listlessly in the morning 
sun, apparently without the least exertion on his part. I watched 
him carefully for several moments as he circled about, but could 
not detect the slightest motion in his wings. 
One other bird I saw here to which is attached a good deal of 
interest, the white-necked crow (Corvus cryptoleucus). I have 
found these birds common along the base of the Rocky Mountains, 
from Cheyenne at the north, to Trinidad at the south; and from 
the Snowy Range, to a point thirty miles out on the plain, yet Mr. 
Ridgway writes me that these birds “are entirely out of their 
previously known range.” I strongly suspect that this bird has 
been mistaken by naturalists, who have ornithologized in this sec- 
tion, for the common American raven (Corvus carnivorus), since 
it seems to me impossible that any one should remain here any 
length of time without seeing it; still the Western bluebird (Sia- 
lia Mexicana), and several other birds which are equally abundant 
here, are in the same predicament. The raven is said to be com- 
mon in Colorado, but during a year spent in collecting in different 
parts of the territory, I have seen but a single pair! 
HARVEST MITES. 
_ BY PROF. C. V. RILEY. 
Ty the “American Entomologist” (vol. 1, no. 5) an account was 
_ given of the eight true insects, and of some other ringed ania? 
_ or articulates, known to be parasitic on man. The insects are 
the head-louse (Pediculus humanus Linn.), the body-louse (Pedi- 
: cervicalis Linn.), the crab-louse (Pediculus pubis Linn.), 
human bot-fly (Gstrus hominis Gmelin), the common flea 
ulex irritans Linn.), the chigoe (Pulex penetrans Linn.), the 
common bed-bog maoa lectularia Linn.) and the r m 
C). 
