﻿TABANIDAE — PART I. 117 



River (north-east of Lake N garni), Bechuanaland Protectorate, 20. ix. 1909 

 (R. B. Woosnam) ; one Q from Buluwayo, 12. ix. 1909, "attacking man during 

 the heat of the day " (E. C, Chubb) ; and one Q from the Mafungabusi District, 

 Southern Rhodesia, 17. ix. 1910 (R. W. Jack). 



Genus Cadicera, Macq. 

 Cadicera biclausa, Lw. 



Pangonia biclausa, Loew, Ofvers. af Kongl. Vetensk.-Akad. Forhandl., xiv, 

 p. 337 (1857) ; Abhandl. des Naturwiss. Vereins fiir Sachsen und Thiiringen, 

 ii, p. 91 (1860) ; 'Die Dipteren-Fauna Siidafrica's,' p. 19 (1860). 



Cadicera nigrescens, Ricardo, Annals and Magazine of Natural History, Ser. 7, 

 vol. vi, p. 161 (1900). 



Cadicera nigricolor, Austen, Annals and Magazine of Natural History, Ser. 8, 

 vol. vi, p. 342 (1910). 



The foregoing synonymy is the result of the acquisition by the British Museum 

 (Natural History) of the type of Cadicera nigrescens, Ricardo (formerly in the 

 collection of Mr. W. L. Distant), and of five specimens (2(J(J and 3 Q Q— -the 

 latter caught in the act of " attacking man ") of Cadicera nigricolor, Austen, 

 from the Chirinda Forest, Melsetter District, Southern Rhodesia, 10-12. X. 1911 

 ( C. F. M. Sivynnerton : presented by the Entomological Research Committee). 



The study of this material shows that all the specimens examined belong to 

 one species, which must be designated Cadicera biclausa, Lw. ; and that, whereas 

 the abdomen of C. biclausa, Lw., is sometimes uniformly purplish-black in both 

 sexes, in other cases, in one or both sexes, the distal extremity of the abdomen 

 is, or at least the lateral borders or posterior angles of the third or fourth and 

 following segments are ferruginous or burnt-sienna-coloured. 



The female of Cadicera biclausa, Lw., is distinguished from that of C. rubra- 

 marginata, Macq., # by the more slender shape of the terminal joint of its palpi, 

 by the presence of a pair of small, elongate, greyish-white spots on the anterior 

 margin of the thorax, between the humeral calli, and by the absence of a median 

 ferruginous stripe or spear-shaped mark on the tergites of the second and third 

 abdominal segments. It may be noted that what Loew calls a " variety " of his 

 species would appear to be in reality C. rubramarginata, Macq. 



Since the type of C. nigrescens, Ric, is from Zomba, it is evident that the 

 range of C. biclausa, Lw., — which was described from a specimen from Bechuana- 

 land, and is represented in the Museum collection by a male from Pretoria 

 (W. L. Distant), in addition to the specimens already mentioned — extends to the 

 north at least as far as the Nyasaland Protectorate. 



Cadicera chrysopila, Macq. 



Pangonia chrysopila, Macquart, Hist. Nat. des. Ins. Dipteres, I, p. 194 

 (1834). 



This species is evidently a Cadicera, and, so far as it is possible to judge from 

 the description, Pangonia nobilis, Wied. (Auss. zw. Ins. II, p. 622 (1830)), also 

 belongs to the same genus. Miss Ricardo (Ann. Mag. Nat. Hist., ser. 8, vol. i, 



* For coloured figure of this species see Austen, ' Illustrations of African Blood-Sucking 

 Flies,' Plate III, fig. 19 (1909). 



