SIMULIIDAE OF AFRICA 189 



APPENDIX 



The additional information given below became available while this paper was 

 in press. 



1. Subgenus Dexomyia (pp. 49-55). Adult material collected by the Belgian 

 Zoological Missions to St. Helena permits the description of Simulium (Dexomyia) 

 atlanticum sp. n. to be augmented as follows: 



o* : antennae reddish-yellow on first two segments and base of third, remainder brownish. 

 Scutellum with much long pale hair as well as some dark hair. Legs with fore coxae and all 

 femora reddish-yellow (except for slight apical darkening), tibiae brownish but paler medially, 

 tarsi blackish brown except for yellowish basal halves of hind basitarsi. ? : antennae coloured 

 as in o* except that flagellum more brownish orange. Frons pale grey pruinose, occiput largely 

 brownish pruinose. Scutum pale ashy grey pruinose over dark brown ground colour. Pleural 

 membrane sometimes totally bare (probably naturally, and not due to rubbing). Legs coloured 

 as in o" except that reddish-yellow parts more strikingly contrasting with dark parts. 



The specimens seen have been labelled as paratypes and are additional type- 

 material to that recorded on p. 55. Their data are: — 



Paratypes. St. Helena Island : i<$, Basse Fisher's Valley, 1000 ft., 19.xii.1965, 

 at light (MRAC, Tervuren) ; 1$, below Diana's Peak, 22.V.1967 (MRAC, Tervuren) ; 

 i<$, Teutonic Hall, 1600 ft., xii.1965, at u.v. lamp (MRAC, Tevuren) ; 1$, Teutonic 

 Hall, 1500-1800 ft., ii.1967 (BMNH) ; i<$, High Central Ridge, 2600-2700 ft., 

 11. xii.1965 (BMNH) ; 1$, High Central Ridge, Cabbage Tree Road, 2500 ft., hi. 1967 

 (MRAC, Tervuren). 



2. Subgenus Phoretomyia (pp. 79-82). A new species obtained by Disney 

 (in press) in Cameroun Republic lives in phoretic association with the river prawn 

 Atya africana Bouvier (Crustacea : Decapoda : Atyidae) and does not fit any of 

 the three defined species-groups on either its morphological characters or its ecological 

 relationships. It is being described elsewhere (Lewis, Disney & Crosskey, in press) 

 and assigned to a separate species-group. 



3. Subgenus Lewisellum. Females of an unidentified species from Cameroun 

 Republic (possibly ovazzae) have the yellow scaling of the abdomen largely confined 

 to the base, and resemble females of Phoretomyia. They are an exception to the 

 female abdominal characters cited for Lewisellum in the key (p. 39) and diagnosis 



(P. 76). 



4. Subgenus Freemanellum (pp. 92-94). Adult material of the type-species, 

 S. (F.) berghei, has been obtained from the Mambilla Plateau area of Northern 

 Nigeria (collected by J. C. Deeming and H. Roberts in November-December, 1968, 

 and sent to BMNH), and Garms (personal communication) has found S. (F.) debegene 

 in Liberia. Map 8 (p. 185) and the distribution information (on p. 92) should be 

 augmented accordingly ; the Nigerian record makes the known distribution of the 

 subgenus Freemanellum much less disjunct than it previously appeared (see p. 94). 

 The female specimens of berghei from the Mambilla Plateau have the pleural mem- 

 brane bare, and as with debegene, the female sex of berghei may therefore have the 

 membrane either haired or bare (it is haired in females seen from Ituri, eastern 

 Congo) ; the males of Freemanellum, on present evidence, always have the pleural 

 membrane haired. 



