286 ERNEST E. AUSTEN—NEW AFRICAN 
Tabanus crocodilinus, which should be readily recognisable by means of the 
characters mentioned in the diagnosis printed in italics bike does not appear to 
be especially closely allied to any one of its congeners at present described. 
Although the absence of an offshoot or upwardly directed prolongation from its 
single frontal callus would place it in Surcouf’s “ Fifteenth Group,” the fact 
that its front tibiae are not swollen—apart from all other characters—is alone 
sufficient to show that the new species would be entirely out of place in this 
division, which consists solely of Tabanus maculatissimus, Macq. and T. irroratus, 
Sureouf, 
Tabanus pertinens, sp. n. (fig. 2). 
3S Q.—Length, J (16 specimens) 11 to 13°6 mm., Q (30 specimens) 8°8 to 
14 mm.; width of head, ¢ 4 to 45 mm., Q 2°75 to 4:4 mm.; width of front 
of Q at vertex just under 1 to 1:25 mm. ; length of wing, d 9 to 10°25 mm., 
© 7 to 11:2 mm. 
TERZIWT 
Fig. 2.—Tabanus pertinens, Austen, 9. x 4. a, head of g 
from above. x 4. 
Small or smallish, greyish, elongate species, with eyes in G densely clothed 
ubove with fine, short, pale hair, front in Q broad, frontal callus in Q absent or 
scarcely noticeable, and with dorsum of abdomen in both sexes marked (as shown in 
fig. 2) with four series of elongate black or clove-brown marks, forming four 
narrow longitudinal stripes, which are more or less interrupted on the hind margins 
of the segments. 
3 .—Head (fig. 2a): wide (greatest transverse diameter of each eye consider- 
ably longer than greatest vertical diameter), light grey, face, jowls, and basi- 
occipital region clothed with whitish hair ; frontal triangle raw-umber-coloured, 
shining (dull smoke-grey pollinose immediately above bases of antennae and also 
at apex) ; eyes (cf. fig. 2a) with a bluntly fusiform, horizontal area (bisected by 
the impressed median line formed by the division between them) of larger 
