28 A. WATSON 



Species-group erosa 



Venation as in Text-figs, i, 2. $ genitalia (see labelled Text-fig. 56) : uncus bilobed, each 

 lobe truncate or acuminate posteriorly ; valve small, with strongly sclerotized, curved, inwardly 

 directed basal process ; diaphragma pouch-like, invaginate anteriorly dorsal to saccus ; 

 aedeagus variously shaped at apex, vesica with single cornutus ; eighth sternite bilaterally 

 symmetrical, paired posterior processes very short in notialis, graciosa, griveaudi and inornata but 

 long in remaining species ; eighth tergite with short apodemes. $ genitalia as in text-figures ; 

 signum elongate, tapered, V-shaped in cross-section. 



Ten species are included in this group. Seven of these are African. The remain- 

 ing three, carnea, graciosa and griveaudi, are endemic to Madagascar : they are 

 closely related to each other and to notialis, the only South African species. A 

 single female from W. Kivu (Congo) and a male from Lourenco Marques (Mozambique) 

 in the collection of the British Museum (Natural History) are doubtless close relatives 

 of notialis and probably represent, respectively, two new species. The species 

 heringi and heterogyna form a superspecies. The species erosa, tumidula, pallida and 

 robusta are very closely allied and are almost identical in colour-pattern and 

 coloration. 



Key to Species 

 Males 



1 Posterior processes of eighth sternite as long as apodemes (e.g. Text-figs. 32, 59) . 2 



- Posterior processes of eighth sternite minute, apodemes short (e.g. Text-fig. 46) . 7 



2 Posterior processes of eighth sternite arcuate, arising from near middle of posterior 



margin (e.g. Text-fig. 32) 3 



- Posterior processes of eighth sternum straight, separated by width of posterior margin 



(e.g. Text-fig. 59) 6 



3 Aedeagus as in Text-fig. 42 ; uncus with short, anterior process (Text-fig. 40) ; valve 



processes robust, densely setose (Text-fig. 40) ..... robusta (p. 33) 



- Aedeagus not modified as in robusta ; valve process less robust, not densely setose ; 



anterior process of uncus longer than in robusta ...... 4 



4 Aedeagus with two lateral, apical carinae (Text-fig. 37) ; uncus as in Text-fig. 39 ; 



posterior arms of eighth sternite with small dorsal bulge . . . pallida (p. 31) 



- Aedeagus with lateral apical carinae ; uncus with longer or shorter anterior processes 



than in pallida ; posterior arms of eighth sternite without dorsal bulge ... 5 



5 Anterior processes of uncus broad, flattened (Text-fig. 35) . . . erosa (p. 31) 



- Anterior processes of uncus short (Text-fig. 31) ..... tumidula (p. 29) 



6 Valve processes short, not overlapping (Text-fig. 62) ; posterior processes of eighth 



sternite much longer than apodemes (Text-fig. 64) .... heringi (p. 43) 



- Valve processes very short, overlapping at median line (Text-fig. 58) ; posterior 



processes of eighth abdominal sternite about equal to length of apodemes (Text-fig. 



59) .......... heterogyna (p. 40) 



Valve processes extending posteriorly nearly to anterior 



(Text-fig. 50) 



Valve processes short, not extending as far as uncus lobes 



Uncus as in Text-fig. 44 



Uncus not as in Text-fig. 44 .... 



Uncus and valve processes as in Text-fig. 47 



Uncus and valve processes as in Text-fig. 56 



margin of uncus lobes 



griveaudi (p. 38) 



notialis (p. 35) 



carnea (p. 36) 

 graciosa (p. 38) 



