95 



ance, T. qnndriquttatns can bo distinguished without difhcuHy by 

 its less sharply detincd wing-markings, and especiall\' \>\ the absence 

 of a dark brown transverse band running across the proximal ex- 

 tremity of the discal coll. 7'. qnadrigutUdus is at present represented 

 in the National Collection by a single female (the type of the species) 

 from Nguele, Usambara (south-east shore of Lake Victoria), German 

 East Africa {received jroyn Dr. Krober). According to Surcouf and 

 Roubaud, this species also occurs in French Congo, where it is 

 " very common at Brazzaville at the commencement of the wet 

 season, bites cattle, and even enters houses." * 



Tabanus marmoratus, Surcouf. 



(The description of this species has not yet been published, 

 5, VII., 1909.) 



Plate VII., fig. 52. 



The figure of this West African species, which was prepared from 

 the type,t the only specimen available when the drawing was made, 

 is unfortunately a good deal too red as regards the anterior portion 

 of the body. The examination of a well-preserved female of T. 

 marmoratus recently received shows that the actual colour of the 

 dorsum of the thorax is slate-grey, and that of the hair on the 

 posterior angles white ; as regards the abdomen, the first segment 

 is grey, with wliitish hairs on the hind border, the second clove- 

 brown, mth a deeper posterior border of wliitish hairs ; the re- 

 mainder is black, with median triangles clothed -with silvery hair 

 on the hind margins of the third, fourth, and fifth segments (the 

 triangle on the fourth segment being the largest), and a narrow 

 band of similar hair on the hind margin of the fourth segment. 



The soUtary specimen of T. marmoratus in the Museum is a female 

 from Obuasi, Ashanti, May 27th, 1907, " caught in house " {Dr. W. 

 M. Graham, W.A.M.8.). 



* Of. Surcouf and Roubaud, Bulletin du Museum National (VHiatoire Naturellr, 

 Ann^e 1908, No. 5 (Paris, 1908). 



■j- Kindly lent by tho authorities of the Museum National d'Histoire Naturelle, Paris. 



