African Cichlid Fishes of the Genus Tylochromis. 163 
6. Megalognatha sexlineata. 
Cistela 6-lineata, Fab. loc. cit. Habitat ——. 
Cneorane sexlineata, Fab., Gemm. & Har. Cat. 
Megalognatha bohemanni, Baly. 
7. Diabrotica melanocephala. 
Cistela melanocephala, Fab. Syst. Ent. 1775, p. 118. Amer, Septeutr. 
Crioceris vittata, Fab. op. cit. p. 122. Carolina. 
Diabrotica vittata, Fab., Gemm. & Har. Cat. 
The identity of Cistela melanocephala with Crioceris vittata 
is admitted by Fabricius himself in his later works (Ent. 
Syst. 1. 2, 1792, p. 12), and the name Crioceris melanocephala 
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 Fishes of the Genus 
Tylochromis. By OC. Tate Reaan, 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 denticu- 
late ; two lateral 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 prezorbital, 
slightly exposed distally ; premaxillary processes rather 
long, usually reaching frontals. Teeth in jaws small, conical, 
in two to five series, outer sometimes enlarged. Lower pha- 
ryngeals united by interlocking suture to form a triangular 
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 XITI-XVI 
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 strong, formed by parasphenoid only, ending in 
a broadly ovate or subtriangular articular surface, narrowed 
