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RE My ee Tv eee Mae 
IY Ay (ae 
DIPTERA. — RT 
Professor Garman gives the following key by which the different 
species of bot-flies may be distinguished : 
1. (6) Discoidal cel] closed by cross vein. 
PP tyes Le Wa irtow B35 o2 oS Oe tae oot eee bay cee eee G. equi. 
3. (2) Wings not marked with brown. 
4. (5) Anterior basal cell nearly or quite equal to the discoidal cell inlength. G. nasalis. 
5. (4) Anterior basal cell markedly shorter than the discoidal cell. G. hemorrhoidalis. 
ne eMnt OPI OMS 22S le ots oe agen phe Once Sate meer eee tener G, pecorum, 
Gastrophilus pecorum Fab. 
We are not aware that this species has been encountered in the 
United States, and if so it is evidently rather rare. The following 
paragraph from Professor Verrill’s report would seem to indicafe an 
acquaintance with specimens collected in this country: 
The Gastrophilus pecorum is densely covered with yellow hairs, with a band of 
black hairs on the thorax behind the suture in the male. The female is yellowish 
brown, the abdomen black, with yellowish hairs at its base, as well as on the 
thorax: The wings are grayish or light brownish, clouded with yellowish brown. 
The larve are similar to those of the more common G. equi, and have similar habits. 
The flies appear at the same time. 
Osten Sacken’s list of American Diptera records it only from Jamaica 
on the authority of Walker. 
THE BoT-FLIES OF CATTLE: WARBLE FLIES. 
Until a few years ago it was assumed that the common bot-fly affect- 
ing cattle in this country was the same as the one most common in 
European countries, and the same specific name was applied to it with 
apparently little careful examination of either larve or adults to deter- 
mine the question with certainty. 
Following the announcement of Dr. Curtice, that the larve reached 
the backs of the animals through the cw@sophagus, a careful review of 
all available material was made (Riley, Insect Life, Vol. LV, p. 302), 
which indicated that the species most abundant,if not the only com- 
mon form, was not the bovis of Europe, but lineata, which is likewise 
European in distribution. 
There is so much in common, however, in the habits and nature of 
the injury of the two species that it seems appropriate to discuss some 
of these general features for the two species, and then to give the dis- 
tinctive features for the two forms with reference to such differences of 
habit or treatment as may be necessary. 
A considerable portion of this general matter was prepared prior to 
the discovery of the identity of our species with lineata, and, while 
written with bovis in mind, applies properly to the former species. 
Historically, bovis has been recognized the longer, having doubt- 
less been known from earliest times, and the larva often mentioned in 
writings from 1716 on as, possibly, also lineata, but bovis was described 
