212 ENTOMOLOGICAL SOCIETY 



OUR AMERICAN OX WARBLES. 

 BY C. V. RlLEY. 



I desire also to present to the Society a few interesting data 

 in reference to the species of Hypoderma which affect cattle in 

 the United States. I have for some time had figures made of 

 Hypoderma lineata with a view of more particularly pointing 

 out the differences in habit between it and the better known 

 Hypoderma bovis, and the receipt of Dr. F. Brauer's recent com 

 munication * is my excuse for bringing the matter now before 

 the Society. Dr. Brauer makes it clear that lineata should be 

 considered a distinct species from bovis, though other authors, 

 especially Clarke, have considered lineata but a variety of bovis. 

 An interesting point brought out by Dr. Brauer, however, is, 

 that through some discoveries of the late Dr. Adam Hand- 

 lirsch (who, by the way, made some most interesting Diptero- 

 logical observations and discoveries) he has been enabled to 

 prove that linaeta occurs in Europe often in the same regions 

 and sometimes on the same animal with bovis. It has in fact 

 been obtained from Brescia, near the Tyrol, in Norway, in 

 the Crimea, in the Balkans, in the Caucasus, in Dalmatia, and 

 in England. In North America Brauer quotes it from Texas, 

 and, on Williston's authority, as ranging to Arizona and 

 Northern California, while Walker described it as Oestris sup- 

 plens, from Nova Scotia. Another interesting fact which he 

 brings out is that it inhabits our buffalo. The material in the 

 U. S. Nat'l Museum includes some specimens actually bred 

 from the larvae which I received from Dr. Salmon, and ten 

 specimens received from correspondents, as the Heel Fly from 

 various points in Texas, and two by the same name from New 

 Jersey, one of which was reported to have "been seen ovi 

 positing just above the hoof of a cow. I have five collected 

 specimens from Colorado, one of which differs from the normal 

 type in having a very scanty pubescence on the face. One of 

 the specimens was collected in Southern Georgia, and three 

 are without any locality label. Of the larvae of different sizes 

 (all agreeing with Brauer's description of lineata and the larvae 

 which are actually connected by breeding with lineata] one is 

 from Arkansas, four without date or locality, two from Texas, 

 and two from Illinois. All these data confirm the reference 

 of the so-called ' ' Heel Fly ' ' to lineata. 



Another interesting question is brought up in this connec 

 tion, viz., that so far as the material in the Museum is con 

 cerned it indicates that lineata is by far the most common 



* Verhaudlungen der Kaiserlich-koeniglichen Zoologish-Botanischen Gesellschaft in 

 Wien. Wien, 1890. Page 590, " Ueber die festellung des Wohnthieres der Hypoderma 

 lineata Villers durch Dr. Adam Handlirsch uud andere Untersuchungen und Boobach- 

 tungen an Oestriden." 



