110 INSECTS AFFECTING DOMESTIC ANIMALS. 
In the accompanying figures, 50 and 51, from specimens belonging to 
the National Museum, the adult is shown in dorsal and side view, while 
figure 53 represents a specimen captured at Ames, Iowa, and which 
agrees perfectly with the form described as horripilum. The points of 
difference will be noted as pertaining to the fullness of the head in 
front of the eyes and in the form of the abdomen. 
The larva shown in figure 52 is from a partially contracted specimen, 
which probably accounts for the difference between them and the fuller 
specimens shown in figure 54. The latter figures are from specimens 
collected by Mr. George K. Cherrie from the common rabbit at Ames, 
lowa. ' 
While the material at hand so far favors the belief that we have here 
but one species, it is desirable that a larger number of both larve and 
adults should be examined, and especially that more specimens be bred 
in order to establish beyond doubt the connection between certain 
forms of larve and the adults. 
THE COTTON-TAIL Bot. 
(Cuterebra fontinella Clark.) 
This species was originally described by Clark from specimens taken 
in Illinois, but it remained practically unknown until the descriptions 
by Townsend in Insect Life (Vol. V, pp. 317-320). It is a large species, 
the flies being four-fifths of an inch and larve an inch in length. (See 
the full description by Townsend already noted.) 
OTHER SPECIES. 
Cuterebra buccata Fab. is another species that has been recorded at 
various times in this country (Kentucky, Pennsylvania, Carolina, Mas- 
sachusetts, Washington, D. C.) and is doubtless a fairly common para- 
site of squirrels and possibly other small mammals. 
Aside from these that have been mentioned there are a number of 
species in the genus Cuterebra from Ainerica which are known only in 
the adult stage, and to discuss them here would not only too greatly 
extend the paper, but would be of little value, since for monographic 
purposes the student will naturally refer to the works of Clark and 
Brauer. 
Bot-FLY OF MAN, MONKEYS, DOGs, ETC. 
(@strus hominis L.) 
The question whether there is a bot-fly peculiar to the human species 
has been much discussed, but the burden of evidence at present avail- 
able leads to the view that the species occasionally infesting man 
occurs also on dogs, monkeys, etc., and we therefore consider the 
Species under the above heading. 
