50 P. E. S. WHALLEY 



differ from the holotype from Uganda in the shape of the enlarged basal part of the 

 gnathus at the junction with the tegumen. In the holotype this part has elongate 

 points on either side, whereas in the specimens from Sierra Leone these points are 

 absent. Until more material of this species is available the significance of this 

 difference is not known but is probably subspecific. A similar difference between 

 the holotype and a specimen from Ivory Coast was noted in the original description. 



D. incognita Whalley, 1968 : 14. Map 23. Tanzania; Rhodesia; South West 



Africa. 

 D. amani Whalley, 1968 : 14. Map 22. Tanzania. 



One new species has been found since the publication of the revision of Dysodia 

 in Africa (Whalley, 1968), this is described below. 



Dysodia parvita sp. n. 



(PI. 4, figs 11, 12; PL 27, fig. 146) 



<J. Wing, 8 mm. Vertex yellowish brown. Antennae shortly dentate. Proboscis reduced. 

 Labial palps with third segment 1/3 length of second, upturned, not reaching vertex. Frons 

 rounded, not projecting between eyes. Thorax orange-brown. Hind tibia with outer spur of 

 distal pair 1/2 length of inner spur. Fore wing, pattern as in PI. 4, figs 11, 12, orange-brown 

 with reddish brown fringe and indistinct median brown fascia. Underside similar, median 

 fascia consisting of anterior and posterior patch of brown, more distinct than on upper side. 

 Radial veins from cell. Hind wing, colour and pattern as fore wing. Sc+Rj^ and Rs free. 



Genitalia q" (PI. 27, fig. 146). Uncus long and slender. Gnathus arms lightly sclerotized, 

 not meeting in mid-line. Valves simple, lightly sclerotized, sinuous sacculus process. Juxta, 

 two flattened lateral lobes. Saccus reduced. Aedeagus with minutely spined vesica. 



$. Unknown. 



Discussion. This is the smallest species in the genus and can be separated from 

 all the others by its size. The dorsal process on the tergum of the genitalia is not 

 as large as in the other species and there are fewer spines on the tarsi than in some 

 of the other species of Dysodia. Until a female of this species is found it is difficult 

 to give the exact relationship of the species in the genus. The "simple" genitalia 

 show that the species is far removed from the magnifica-grou-p and the actual placing 

 of parvita in a species-group is difficult. Tentatively it is placed in the subsignata- 

 group, mainly on the similarity of the antennae to species in that group. There is 

 considerable variation in the series of parvita examined, several of them being more 

 heavily patterned and with a darker transverse fascia than the type. 



Distribution. Map 23. S. Africa. 



Material examined. 



Holotype $, South Africa: Beit Bridge, 22. iv. 1956 (van Son 6- Vari), BM slide 

 no. 10053, in TMP. 



Paratypes. South Africa: i $, data as type; 1 $, Nyandu Bush, KNP survey, 

 22.xi.1961 (Vari & Rorke), in TMP; 1 <$, Punda Milia, KNP survey, 1-5. xii. 1964 

 (Vari & Potgieter), in TMP; 1 <£, Punda Milia, KNP survey, 9-11.xii.1963 (Vari); 

 1 $, Pafuri, ii.1961 (Mockford), in TMP. 



