Download Trewavas (1935) - The Cichlid Fishes of Lake Malawi ...

the Cichlid Fishes of Lake Nyasa. 7 5P. williamsi. Large specimens are easily distinguished fromP. zebra by the fact that the teeth remain bicuspid (outer)and tricuspid (inner), whereas in P. zebra they become simple.6. Pseudotropheus fuscus, sp. n.A single specimen, 82 mm. in total length (coll. Christy).This fish resembles P. williamsi in the dentition and in thesmall eye (3g in length of head), but differs from all otherspecies in the narrow interorbital region.7. Pseudotropheus auratus (Boulenger), 1897.Pseudotrophewr aurdwr Regan, t. c. p. 683.The type and forty-four specimens (coll. Christy), 40 to90 mm. in total length. Of these, 37 are females, 40 to 80 mm.long, and 7 are males, 70 to 90 mm.The extraordinary differences in coloration between thesexes, with the possibility that the males may be less numerousand larger, indicate that the breeding habits of this speciesmay be unusual. The ova are few and large, about ten ineach ovary ; thus efficient measures for the care of the broodmay be expected.8. Pseudotropheus novemfasciatus Itegan, 1921.Pseudotropheus novemfasciatwr Regan, t. c. p. 683.The type (coll. Wood), 66 mm. in total length, and fifteenspecimens (coll. Christy), 63 to 94 mm., from Deep Bay,Monkey Bay and the Bar, Lake Nyasa.The tooth-band, rounded in the young, becomes nearlytransverse in the adult.9. Pseudotropheus microstoma, sp. n.Two specimens (coll.Christy), 68 and 100mm. in total length,from Monkey Bay.These fishes resemble P. tropheops in every way except inthe very narrow mouth and curved tooth-band.10 a. Pseudotropheus tropheops tropheops Regan, 1921.Peeudorq?,hewr tropheops Regan, t. c. p. 683, text-fig. 3.The types (coll. Wood), 116 and 120 mm. in total length,and sixteen specimens (coll. Christy), 80 to 110 mm. long, aswell as a number of smaller specimens (coll.Christy), are typicdmembers of the species. They are all from the southern endof L. Nyasa. The vertebre, in one specimen, number 14+ 17.10 b. Pseudotropheus tropheops gracilior, subsp. n.Twenty specimens, 76 to 112 mm. in total length (coll.Christy), from Vua and Deep Bay, are, usually, more slender,