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

116 Dr. Ethelwynn Trewavas on1. Aulonocara nyassa Regan.Aulonoma nyassa Regan, Proc. Zool. Soc. Lond. 1921, p. 727, pl. v.fig. 1.In addition to the three types (coll. Wood), the BritishMuseum (Nat. Hist.) collection now contains forty-threespecimens (coll. Christy), 50 to 180 mm. in total length.The original description must be modified to include thelarger specimens. Teeth in 4 to 8 series, outer bicuspidin young, all slender and conical in larger specimens. Noscales on cheek in young ; a single series and occasionallyone or two of a second series in large specimens. A few middlopharyngeal teeth slightly enlarged.2. Aulonocara rostrata, sp. n.Distinguished from A. nyassse by the longer snout andnarrower interorbital region. Also, even in older specimens,scales are absent from the cheek, or there is only a single,incomplete series. The young of both species have thebody marked with a number of vertical bars, but in A. nyassz9 or 10 of these are below the dorsal fin, in A. rostrata 6 or 7.Twenty-seven specimens (coll. Christy), 48 to 180 mm. intotal length.3. Aulonocara mcrochir, sp. n.Distinguished by the larger eyo and by the long pectoralfin, longer than the head. In the other species the pectoraldoes not exceed the head in lengt'h.A single specimen, 170 mm. in total length (coll. Christy).20. DIPLOTAXODON, gen. nov.Near Haplochrornis. Mouth oblique ; toet,h conical, biserinl.Paired laminar inferior apophyses extending the whole lengthof third or third and fourth vertebrae.Diplotaxodon argcnteus, sp. n.Depth of body 34 in the length, length of head 23 to 3.Head 24 to 3 as long as broad. Snout with straight profile.,longer than diameter of eye, which is 34 to 34 in length ofhead, greater than depth of prsorbital or cheek ; interorbitalwidth 5 to 6 in length of head. Mouth very oblique ; lowerjaw strongly projecting ; maxillary not nearly reaching eye ;teeth conical, in two well-separated series, the outer larger,rather strong anteriorly, 60 to 70 in upper jaw. 3 series ofscales on cheek. 23 to 25 gill-mkcrs on loww part of anteriorarch. Pharyngeal teeth small, bicuspid ; 14 or 15 in a middloseries. 34 to 36 scales in a longitudinal series, 5 from origi~lof dorsal to lateral line. Dorsal XR-SV 11-13 ; spinr~
the Cichlid Fishes of Lake Nyasa. 117slendcr, last 3 length of hcad. Anal I11 10-11 ; third spinestronger and shorter than last dorsal. Pectoral 4j to % lengthof head, not reaching anal. Caudal emarginate. Caudalpeduncie 19 to 1% as long as deep. Silvery.Three specimens, 170 to 180 mm. in total length, from thesouth end of the lake ; also a skeleton.21. LICHNOCHROMIS, gen. nov.Near Haplochrornis, but without inferior apophyses onanterior vertebra Snout long ; mouth narrow ; praemaxillariesproduced and beak-like. Teeth in a single seriesexcept anteriorly ; outer teeth compressed, entire, notchedor distinctly bicuspid.Lichnochromis acuticeps, sp. n.Dopth of body 33 in the length, length of head 24. Snoutstraight, oblique, nearly length of head; pr~niaxillarypedicels % length of head ; lower jaw projecting ; maxillaryending below nostril ; teeth of outer series close-set ; in front2 or 3 inner series of smaller teeth, the anterior pair of thefirst lower series somewhat enlarged. 4 series of scaleson cheek. 12 gill-rakers on lower part of anterior arch.Pharyngeal teeth small. 33 scales in a longitudinal series,5 from origin of dorsal to lateral line. Dorsal XVI 11 ;last spine 4 length of head. Anal I11 9 ; third spine strongerand a, little shorter than last dorsal. Pectoral # length ofhead, reaching origin of anal. Caudal scdy, emarginate.Caudal peduncle 19 as long as deep. A dark bar from eyeto maxillary ; two curved bars across snout, and anotheracross anterior part of interorbital region ; a transverseband across posterior part of interorbital region, an opercularspot ; a blackish oblique band from nape to base of caudal ;dorsal spotted.One specimen, 125 mm, in total length.22. ARISTOCHROMIS, gen. novI+~haps related to H~xplochromis rbrrdesii. The stronglycxnpressed head reoalls that of the Labrid Xyrichthya.A~istochromis christyi, sp. n.Dopth of body 3 in the length, length of head 23 to 3.Upper profile of head convex to in front of eyes, then declivous.Snout as long as or a little shorter than postorbital part ofhead ; diameter of eye 5 to 69 in length of head, less thanprmx%ital depth, 8 to 8 dopth of cheek ; interorbital width6 to 8 in length of head. Przmaxillaries beak-like anteriorly,projerting a little beyond lower jaw ; f dtL of upper lip n:Lrrow,
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