CHRYSOPS 



821 



colour, and are marked with purplish spots and streaks, which 

 Austen considers present useful specific characters. When resting, 

 the wings are kept half open. 



The females inflict a very severe bite, which causes pain, in- 

 flammation, and even at times oedema and fever. 



The eggs, which at first are white and later turn brown or black, 

 are deposited upright in a single layer upon leaves and stems of 

 plants near water, in which, or in the mud in the vicinity, the larvae 

 live. The larvae and pupae resemble those of Tahanus, but in the larva 

 the last antennal joint is longer than the penultimate, and in the 

 pupae the antennae project beyond the head. With regard to patho- 

 genicity, the genus is now known to contain the carrier of Loa loci. 



Fig. 414. — Cadiceva chrysostigma Wiedemann: Female. (X 



As examples the following species may be mentioned: C. dimi- 

 diata va.n der Wulp, 1885, in West Africa; C. distinctipennis Austen, 

 1906, in tropical Africa generally ; C. hicolor Cordier , 1907, in Tropical 

 Ea'st Africa; C. silacea Austen, 1907, in West Africa; C. magnifica 

 Austen, 1911, in Tropical East Africa; C. centurionis Austen, 1911, 

 in Uganda; C. cana Austen, 1911, in East Africa; and C. dispar 

 Fabricius in the Oriental region. 



Silvius Meigen, 1820. 



This widely distributed genus may be exemphfied by Silvius 

 fallax Austen, 1912, found in North-Eastern Rhodesia, and S. 

 decipiens Loew. The characters of the antennae are illustrated 

 in Fig. 408, a, a', and a". 



Cadicera Macquart, 1854. 

 Over a dozen species of this genus are now known in the Ethiopian 

 region, of which the following may be mentioned: C. melanopyga 



