African Cichlid Fishes of the Genus 1y\oQ\\xom\^. 163 



G. Megalognatha sexUneata. 



a stela Cy-lt'neata, Fab. loc. cit. Habitat 



Cneora»e sexlineata, Fab., (temni. & liar. Cat. 

 Megalognatha bohema^mi, Baly. 



7. Diahrotica meJanocephala. 



Cistcla meUiniicej->hala, Fab. Syst. Eiit. 1775, p. 118. Amer. Septentr. 

 Criocen's vittata, Fab. op. cit. p. 122. Caroliua. 

 Diabrotica vittata, Fab., Gemm. & liar. Cat. 



The identity of Cistela melanocephala with Crioceris vittata 

 is admitted by Fabricius liiraself in his later works (Kiit. 

 Syst. i, 2, 1792, p. 12), and the name Crioceris melanocepliala 

 is employed for another species {op. cit. p. 3). The type of 

 C. vittata is said to be in Mus. Dom. Monson. 



XXII. — A Revision of the African Cichlid Fi.^hes of the Genus 

 Tylochromis. By C. Tate Regan, M.A., F.R.S. 



(Published by permission of the Trustees of the British Museum.) 



Tylochromis, Regan. 



Supra, p. 34. 



Body deep, compressed ; scales cycloid or feebly denticn- 

 Ifite ; two latoi'al lines, upper ending below soft dorsal, lower 

 extending far forward, ending behind in three branches on 

 caudal fin. Mouth rather small, terminal, with the lower jaw 

 not prominent; maxillary sheathed by the deep prseorbital, 

 slightly exposed distal!}^ ; |)raitnaxillary processes rather 

 long, usually reaching frontals. Teeth in jaws small, conicjil, 

 in two to five series, outer sometimes enlarged. Lower piia- 

 ryngeals united by interlocking suture to form a trianguhtr 

 plate, with slender, pointed, uni- or bicuspid teeth at least 

 near the posterior angles, and with enlarged, rounded, flat 

 teeth in the middle at least posteriorly. Dorsal XIII-XYI 

 12-17 ; spines slender or moderate. Anal III 7-9 ; spines 

 strong. Pectoral long, pointed. Caudal scaly, truncate or 

 emarginate. 



Occipital crest very strong, extending to anterior margin of 

 frontals ; parietal crests ending above middle of orbits near 

 the orbital margin ; postorbital part of skull short and deep, 

 with lower edge of basioccipital very oblique; pharyngeal 

 apophysis stiong, formed by parasphenoid only, ending in 

 a broadly ovate or subtriangular articular surface, narrowed 



