OCR Text |
Show 130 MR. G. A. BOTJLENGER ON THE AFRICAN AND [Feb. 7, the spots having a tendency to form oblique stripes on the soft dorsal. Total length 180 millim. Lake Nyassa. 43. TILAPIA JOHNSTONI. Chromis subocularis, part., Giinth. Proc. Zool. Soc. 1893, p. 621, pi. liv. fig. B. Chromis johnstoni, Giinth. I.e. p. 622, fig. A. Chromis tetrastigma, Giinth. 1. c. p. 623, fig. C. Tilapia subocularis, Bouleng. Tr. Zool. Soc. xv. 1898, p. 4. Tilapia johnstoni, Bouleng. 1. c. Tilapia tetrastigma, Bouleng. 1. c. Teeth in 4 or 5 series, the outer moderately large and separated by a considerable interspace from the others, which are very minute and conical. Depth of body nearly equal to length of head, 2 | to 3 times in total length. Snout Avith straight upper profile, lg to 1| diameter of eye, which is 3 | to 4 times in length of head and equal to or somewhat greater than interorbital width ; mouth i width of head ; maxillary extending to between nostril and eye ; 3 or 4 series of scales on the cheek ; large scales on the opercle. Gill-rakers short, mostly notched, 11 or 12 on lower part of anterior arch. Dorsal X I V - X V I 10-11; last spine longest, f to | length of head, | longest soft rays. Pectoral pointed, as long as or a little shorter than the head, extending to origin of anal. Ventral reaching vent or anal. Anal III 8-9; third spine a little shorter than longest dorsal. Caudal slightly notched, pointed aboATe, rounded below. Caudal peduncle lj to 1| as long as deep. Scales finely denticulate on the border, 32-33 ~-™ > lat. 1. ^ms *• 11-lo ' 14- lo Pale olive, with 6 to 8 more or less regular dark bars, Avhich may be accompanied or replaced by a few blackish spots ; a dark opercular spot; dorsal with oblique dark streaks and rows of small pale spots ; caudal with small pale spots. Total length 115 millim. Lake Nyassa and Upper Shire River. 44. TILAPIA PECTORALIS. Ctenochromis pectoralis, Pfeffer, Jahrb. Hamb. AAISS. Anst. x. 1893, p. 153, pi. ii. figs. 3, 4, 7, and Thierw. O.-Afr., Fische, p. 16, fig. (1896). Teeth in 5 rows in both jaws, inner very minute. Depth of body nearly equal to length of head, 2-| times in total length. Snout with straight upper profile, as long as the eye, the diameter of which is contained somewhat more than 3 times in length of head and a little exceeds interorbital width ; mouth extending nearly to below anterior border of eye ; 3 series of scales on the cheek ; larger scales on the opercle. Gill-rakers very short, 10 on lower part of anterior arch. Dorsal X V - X V I 8-9 ; soft rays somewhat produced. Pectoral pointed, nearly as long as head |