680 MR. C. TATE EEGAN ON THE 



Chilotilapia rhoadesii Bouleng., 1908. 



Chiloiilajy'm rhoadesii Bouleng. Cat. Afr. Fish. iii. p. 499, 

 fig. 366. 



Deptli of body 2i- to 2^ in the length, length of head .3|. Snout 

 short, declivous ; diameter of eye 4 to 4^ in length of head, 

 prfeorbital depth 4, interorbital width 3. Jaws equal anteriorly ; 

 mouth Avide, with short lateral cleft. 3 or 4 series of scales on 

 cheek. 11 gill-rakers on lower part of anterior arch. Middle 

 pharyngeal teeth moderately strong, subconical. 32 to 34 scales 

 in a longitudinal series. Dorsal XY-XVI 10 ; last spine f to ^ 

 length of head. Anal III 9-10. Pectoral a little longer than 

 head, reaching anal. Caudal densely scaled, emarginate. 

 Cauidal peduncle a little longer than deep. Silvery or bluish; 

 an opercular spot ; sometimes a broad dark ba,nd on each side of 

 back aud a.nother on middle of side ; soft dorsal with series 

 of spots. 



The type (220 mm.) and two specimens of 3 80 and 200 mm. 

 (Wood). 



■ , 6. Astatotilapia Pellegr., 1904 



(type Labrus desfontainesii Lacep.). 



Near Hajjlochromis, but posterior teeth of outer series of upper 

 jaw increasing in size backwards. Teeth in 3 to 5 series, 

 cuspidate or conical, those of outer series of upper jaw sometimes 

 bicuspid anteriorly, conical posteriorly ; band of teeth in lower 

 jaw crescentic. Middle teeth of lower pharyngeal somewhat 

 enlarged. Dorsal XIIT-XYII 8-11. Anal III 7-11. Scales 

 26 to 36. 



Africa. 



This genus includes three species placed byBoulerger in Tilcqna, 

 namely, T. syivnnertoni, T. htirtoni, and T. calUptera, and four 

 included by him in Haplochroviis, H. strigigena, H. onoffati, 

 H. desfontainesii, and H. moeruensis. These are all closely 

 related, agreeing in the form and size of the mouth, the rather 

 short pectorals, comparatively short caudal peduncle (as long as 

 deep), and the rounded caudal. 



Astatotilapia calliptera Giinth., 1893. 



Tilapia calliptera Bouleng. Cat. Afr. Fish. iii. p. 222,' fig. 145. 



Depth of body 2| to 2i in length, length of head 2| to 3-i-. 

 Snout with straight profile, shorter than postorbital part of head. 

 Diameter of eye 3.j to 4^ in length of head, in adult scarcely 

 greater than depth of prfeorbital ; interorbital width 3^ to 4j in 

 length of head. Jaws equal anteriorly; maxillary extending to 

 below anterior edge of eye ; teeth in 3 to 5 series, 40 to 60 in 

 outer series of upper jaw, the anterior bicuspid, the last 2 or 3 

 (young) or 8 or 9 (adult), conical, increasing in size posteriorly. 

 3 to 5 series of scales on cheek. 8 to 10 gill-rakers on lower part 



