°EC 2 71906 
The Ohio %J\Naturalist, 
PUBLISHED BY 
The Biological Club of the Ohio Stale University. 
Volume VII. DECEMBER. 1906. No. 2. 
TABLE OF CONTENTS 
Hine —The North American Species of Tabanus with a Uniform Middorsal Stripe.19 
Hine —Two Species of Diptera Belonging to Asilinae. 29 
Sciiaffner— A Successful Mutant of Verbena Without External Isolation.31 
Durrant—D escriptions of NewMallophaga.il. 35 
Osborn— Note on Habits of Senotainia rubriventris Macq. 38 
Schaffner —Nodding of the Terminal Heads of Silphium laciniatum. 39 
Metcalf —Meeting of the Biological Club. 40 
THE NORTH AMERICAN SPECIES OF TABANUS WITH A 
UNIFORM MIDDORSAL STRIPE. 
James S. Hine. 
There are a number of species of the genus Tabanus in the 
Americas characterized by having a regular gray or yellow 
middorsal stripe continued for the length of the abdomen. Most 
of them have the anterior leg black with the exception of the 
base of the tibia which is gray or yellowish; but there are a few 
variations which will be mentioned later. Such species resemble 
more or less the very abundant and troublesome costalis and 
lineola, which are commonly called green-head flies, and which 
are important stock pests, having been associated in recent years 
with the transmission of certain infectious diseases of domesti¬ 
cated animals. 
There are a score or more of species of this type in North 
America and several more in South America, but they do not 
appear to be so numerous in the Eastern Hemisphere. Green- 
head flies is a common English name for all. Some have a wide 
range, being reported from northern North America to Brazil 
and from the Atlantic almost to the Pacific, while others, so far 
as known, are restricted to much more limited areas. 
Wherever I have observed they are the most abundant of 
their family in season, and are exceptionally persistent in their 
attacks. They are never particularly conspicuous, nor do they 
make much noise when flying around an animal, but appear to 
come from all directions and at once alight on the limbs or under 
parts, and begin biting before their selected victim is scarcely 
aware of their presence. 
Wooded areas appear to have particular attractions for 
them. In southern United States and Central America a 
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harden. 
