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$Mt\.lt\.WI SALTSâ¢ - The Cichlid Fishes of Lake Malawi, Africa$

7 6 Dr. Ethelwynn Trewavas onand darker in colour than typical examples of P. tropheops,as well as having a larger eye and narrower interorbital region.11. Pseudotropheus macrophthalmus Ahl, 1927.Pseudotropheus mucrophthalmus Ahl, Sitzungsber. Ge s. naturf. Fr.Berlin, July 1926 (1927), p. 64.Fifteen specimens (coll. Christy), 76 to 115 mm. in totallength.These fishes resemble the typical specimens of P. tropheopsin the steep snout and low occipital crest, and are even moreextreme in both these characters. Thoy resemble P. tropheopsgracilior in the large eye. They differ from a11 P. tropheopsin the higher average number of dorsal fin-rays, especiallyspines. The colour appears to be uniformly pale ; even thefins are without spots or bands except the single bright spoton the anal in males. I have examined the type in Berlin.3. PETROTILAPIA, gen. nov.In the dentition this genus parallels Petrochromis of LakeTanganyika, but the relationships of Petrochromis are withthe Tilapia group, which it resembles in the fundamentalcharacter of the pharyngeal apophysis, of which the articularsurfaces are formed by the parasphenoid alone, whereas inPetrotilapia the basioccipital forms part of each facet. Thistype of dentition has, indeed, been evolved rnorc than oncein Tanganyika Cichlid*, as well as in Nyasa.A single species.Petrotilapin tridentiger, sp. n.Several specimens (coll. Christy), up to 155 mm. in totallength.In form, numerical characters, and coloration this speciesresembles PseudotropheiLs and Cyathochromis. Especiallynoticeable are the broad black submarginal band oftenpresent on the spinous dorsal, and one or two bright orangespots near the posterior edge of the anal.4. LABEOTROPHEU~ Ahl, 1927.Labeotropheus fuellebomi Ahl.Labeohvpheus ftielleborni Ahl, Sitzmgsber. Ges. naturf. Fr, Berlin,July 1926 (1927), p. 52.Labeotropheus curvirostris Ahl, t. c. p. 53.Numerous specimens (coll. Christy), 50 to 110 mm. in totallength, from Nkudzi and Deep Bay. The type has beenexamined by me in Berlin.There is a dermal thickening of the snout, immediatelyabove _the przemaxillary symphysis, producing the nose-like
the Ciclilid Fishes of Lake Nyasa. 7 7process characteristic of the types of L. fuelleborni. This isvcry weakly developed in the type of L. curvirostris, but,as the Christy collection contains intermediate specimens,I bclieve that there is only one species.The vertcbrac, counted in one specimen, number 14+16.5. CYATHOCHROMIS, gen. nov.Cyathochromis obliquidens, sp. n. (Fig. 3 .)Numcrous spocirnens, from Vua and the soutllern end ofthe lake, up to 150 mm. in total length (coll. Christy).This species is a Pseudotropheus in all except the dentition.The vertebrae, in two specimens, number 15+16.Fig. 3.Gyathochromw oblipuidens.a, anterior outer tooth of lower jaw ; b, two views of one of these ;c, two views of an inner tooth.6. CYNOTILAPIA Regan, 1921.Cynotilapia afra (Giinther), 1893.Cynotilapia afra Regan, t. C. p. 684.Known only from tho types, 85 and 95 mm. in totiil I~agth.'l'llc vcrtcbrm, counted in one specimen, number 15+16.7. CHRISTYELLA, gen. nov.Christyella nyasana, sp. n.13 or 14 gill-rakers on lower part of anterior arch. 32 scalesin :I, longitudinal series, 5 from origin of dorsal to 1atera.l line,7 or 8 between pectoral and pelvic fins. Dorsal XVIII 9.Anal 111 8. Colour pale brownish above, silvery below ;fins clear ; a bright spot near posterior edge of anal.A single specimen, 114 mm. in total length (coll. Christy).8. MELANOCIIROMIS, gen. nov.(type, M. melanopterus).This gonus is distinguishod from Pseudotropheus mainlyby the larger and fcwcr phsryngcd teeth, as may be seenby c8cml)ttrinq figure 4 \vith figures 1 and 2. For the dentitionof the jaws, sce fig. 5.
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