286 



ERNEST E. AUSTEN — NEW AFRICAN 



TabuHus crocodiliiins, which should be readily recognisable by means of the 

 characters mentioned in the diagnosis printed in italics above, 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 Tahanus maculatissimus, Macq. and T. irroratus, 

 Surcouf. 



Tabanus pertinens, sp. n. (fig. 2). 



(S Q ■ — Length, cJ (16 specimens) 11 to 13*6 mm., Q (30 specimens) 8"8 to 

 14 mm. ; width of head, (5" 4 to 4"5 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, cJ 9 to 10*25 mm., 

 7 to 11-2 mm. 



Fig. 2. — Tabaiias pertinens, Austen, ? . x 4. d, head ot $ 

 from above. X 4. 



Small or smallish, (jreyish, elongate species, loith eyes in c? densely clothed 

 above with fine, short, pale hair, front in Q broad, frontal callus in Q absent or 

 scarcely noticeable, and with dorsum of abdomen in hath sexes marked (as shown in 

 fig. 2) loith four series of elongate black or clove-brown marks, forming four 

 narrow longitudinal stripes, ichich arc more or less interrupted on the hind margins 

 of the segments. 



(5 . — 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 mipressed median line formed by the division between them) of larger 



