CICHLID FISHES OF LAKE NYASSA. 



685 



to lateral line. Dorsal XYII 9 ; last spine f to | length of head. 

 Anal III 8 ; third spine stronger and as long as or a little shorter 

 than last dorsal. Pectoral shor-ter than head, not reaching anal. 

 Caudal ? Caudal peduncle as long as or longer than deep. 

 The types, 85 and 95 mm. in total length. 



9. Serbanochromis Regan, 1920. 



As Hajilochromis, but third vertebra without inferior apophyses, 

 fourth with a very small pair. Mouth large ; teeth conical ; 

 cheek deep, with 7 to 9 series of scales. 



A single species. 



Serranochromis thumbergii Casteln., 1861. 



Paratilcqna thumbergii Bouleng. Cat. Afr. Fish, iii, p. 328, 

 fig. 220. 



ISTyassa and Zambezi ; Katanga and L. Bangwelu ; L. Ngami ; 

 Angola . 



10. Haplochromis Hilgend., 1888 

 (type H. ohliquidens Hilgend.). 



Ctenochromis Pfeff"., 1893 ('pectoral is). 

 Champsochromis Bouleng., 1915 {cmruleus). 



An outer series of bicuspid or conical teeth, decreasing in size 

 posteriorly, and one or more inner series of smaller biciispid^or 



Text-fia;ure 4. 



a. Lower p}iar3'iigeal of Haplochromis tetrastigma. 



b. ,, ,, a. placodon. 



conical teeth. 2 to 6 series of scales on cheek. Scales usually 

 distinctly denticulate. Pharyngeal apophysis formed by para- 

 sphenoid in middle and basioccipital at sides. Third A^ertebra 

 with inferior apophyses, which meet below. 



52 species of this genus occur in ISTyassa, all of them endemic. 

 In the great number and diversity of species of Hajolochromis 



