175 



Kertesz, Cat. Dipt., Ill, p. 277, 1908. 

 Atylolns rusticus, Leonardr, Ins. Noc., Ill, p. 374, 1900. 



Ricardo, Ann. Mag. Nat. Hist. (7), XVI, p. 197, 1905. 

 Verrall, Brit. Dipt., V, p. 384, 1909. 



Tabanus rousselii, Macquart, Dipt. Exot., I, 8, p. 181, 1839; Exploc. 

 Sc. de. l'Alg., Zool., Ill, p. 423, 1849. 

 Walker, List Dipt. Brit. Mus., V, suppl., I, pp. 225 & 229, [854. 

 Kertesz, Cat. Dipt., Ill, p. 277, 1908. 

 Venal!, Brit. Dipt., V, p. 388, 1909. 

 A rather small species, easily distinguished by the greyish black 



abdomen which has two inconspicuous very narrow somewhat darker 

 stripes. 



Female. Head moderately broader than the thorax, and shorter 

 than half the thorax. Frontal stripe parallel-sided, little more than four 

 times as long as it is broad, dark ashy grey with slight yellowish 

 tinge, and bearing short somewhat sparse depressed whitish yellow 

 pubescence all over and stout a little longer curved black hairs which 

 do not extend to the part between the upper callus and frontal triangle, 

 and which are usually less conspicuous than those in European species; 

 two frontal calli on the frontal stripe entirely separated, shining black 

 and dot-like, in which the lower one just above the frontal triangle is 

 usually larger- and transverse, while the upper one is somewhat 

 longitudinal ; vertex without the ocelligerous tubercle but that part is 

 very inconspicuously elevated, and bearing rather numerous black hairs 

 and whitish pubescence intermixed ; frontal triangle pale yellowish grey, 

 bare from pubescence, and with a narrow longitudinal furrow in the 

 middle from between the antennae to the lower frontal callus, and at the 

 upper margin with an inconspicuous transverse furrow/ which is broadly 

 interrupted at the middle. Sidecheeks narrower than half the width of 

 epistoma, pale yellowish grey, with short whitish yellow pubescence 

 which becomes longer, more dense, and pale yellow on the jowls and 

 near them ; epistoma in mostly part usually more yellowish than the 

 side-cheeks, bearing a short greyish ye'Jow-white pubescence which 



