from the. Quanza and Benyo Rivers. 539 



ncvr species of Petersius and tlie pretty little new Barbus 

 inu.w)nht. 



" l^lxploration of the Quanza River at Cunga, Dondo, and 

 Cambumhe f^avc also vaiir.ihlc results. The Ciclilid perches 

 Tildpia Jl(iv()inar(jiii(ita and Ti/ajjta cabra are very delicious 

 catiu^r ; they are plentiful at Cunga and form a highly 

 appreciated comiucrcial commodity, both fresh and sun- 

 dried, under the local names of 'shopa' and ' cacusso.' 

 Tlu; single specimen of the new Petrocep/ta/us cnnf/anus as 

 well as the single specimen of the large rcd-l)ro\vn Lntjanus 

 eutactus were captured at Cunga. The casting-net secured at 

 Dondo the single specimen of the new Syn(jiiaHius, the two 

 tiny specimens of llaplochilus mncrurus, and quite a number 

 of the new Barilius. Cambambe is a mountainous region 

 ■where the River Quanza forms rapids ; below these rapids 

 the new Physailia and the two new species of Chrysichthys 

 were obtained by using dynamite. 



" In recognition of the kind assistance given by His 

 Excellency Lieut. -Colonel Jose Augusto Rocadas (Governor- 

 General of Angola) and by Senhor Manoel Francisco da 

 Costa Serao (Director of the Companhia de Camino de Ferro 

 Atravers Africa), three of the new species have been named 

 Labeo rucadasi, Barbus rocadasi, and Chrysichthys -oeraoi 

 respectively. Similarly, Barbus rosw has been named in 

 lionour of the Vicar Padre Anastacio Luis Rosa for helpful 

 courtesy during a seven years' friendship.'^ 



Mormyridae. 

 1. Petrocephalus simus, Sauv, 



Quanza River at Cunga and Lucalla River at Kalenge. 

 Native name : Dilele. 



2. Petrocephalus cunganus, sp. n. 



Depth of body equal to length of head, 3^ times in total 

 length. Head slightly longer than deep, with convex upper 

 profile ; snout rounded, strongly projecting beyond month, 

 1 length of head ; mouth below anterior border of eye, its 

 Avidth I length of head ; teeth bicuspid, 11 in upper jaw, 

 21' in lower ; nostrils near lower border of eye ; eye \ length 

 of head, n interorbital width. Dorsal 27, originating ahove 

 first ray of anal ; its length li times in its distance from 

 head and a little greater than its distance from caudal. Anal 



30* 



