28 
transformation of the Tabanidce, I give (following) the history and 
description of T. bovinus, Linn., but with a few remarks added as to 
the chief points by which T. sudeticus (of Zeller) may be distin¬ 
guished from it. 
This fine species, commonly known as the Great Ox Gad Fly, 
is four-fifths of an inch or rather more in the length of the body, and 
from about an inch and a half to two inches in expanse of the wings. 
The male has greenish eyes of one colour (that is, not striped or 
spotted). The fore body black-brown, upper side shining, with five 
indistinct greyish yellow stripes, and short thick mixed brownish 
black and yellowish grey hair. The hinder body (abdomen) reddish 
yellow-brown, having above a central stripe, and tip of a darker or 
blackish tint, with always a triangular yellowish or a triangular pale 
milk-white spot in the middle of the hinder borders of the first to 
the fifth segment. The second to the fourth segment with fine and 
short light yellow-brown and whitish hair at the hinder edge. 
Abdomen beneath orange colour, the three last segments and a 
central stripe along all the segments black-brown or shining black 
or entirely covered with yellowish grey powder. The wings hyaline, 
yellowish grey, and especially yellow towards the fore edge; the 
veins there of a bright to yellow-brown. Legs black-brown ; tibia 
(shanks) more or less yellow-brown ; tarsi (feet) pitch-brown. 
The female differs in the one-coloured eyes being of a bright green 
with a coppery glow. The fore body and its appendages like those 
of the male, only brighter and more clearly striped with grey along 
the back. The abdomen flatter and more rounded at the end than 
that of the male, but similarly coloured and marked, the white 
triangles in the dorsal line variable in size, and reach the front edge 
in the second, third, and fourth segments. The under side of the 
abdomen as in the male; but mostly orange only as far as the 
fourth segment, or, by the side of the central stripe, brown-grey or 
ash-grey; behind this entirely black-grey.* 
Tabanus sudeticus, Zell., referred to above, is to some degree 
distinguishable from the above by its larger size, the females being 
usually from just under to just over an inch in length. The eyes 
(without cross-bands) are not bright green, or greenish, as in 
T. bovinus, but blackish, or blackislnbrown, with a coppery glow; 
and the abdomen, or hinder body, is only orange-coloured for a 
* For full descriptions see “Die Zweiftigler, des Kaiserlichen Museums zu 
Wien,” von Prof. Dr. Friedrich Brauer, pp. 105-216 of ‘ Denkschriften der 
Kaiserlicher Akademie der Wissenschaften,’ Zweiundvierzigster Band, Wien, 
1880 (i.e. ‘ Transactions of the Imperial Academy of Sciences in Vienna,’ forty- 
second volume. 
