156 THE CYPRINODONTS. 



but somewhat rough with concentric striae, flat, thin, not thickened on 

 anterior parts of body or on head ; belly entirely covered. Cheek scales, 

 below tlie eye, in three rows, two of which extend forward farther than 

 the orbit. Origin of dorsal midway from head to caudal, nearly opi^osite 

 that of anal. Caudal broad, subtruncate, two thirds as long as head. Intes- 

 tine about equal to the total length. 



Brown to yellowish brown, clouded or mottled with darker ; sometimes 

 with three rather indefinite and irregular longitudinal series of blotches on 

 the sides. Males and females are adult at a length of two and a half 

 inches. 



The species is most closely allied to 0. alius and 0. luims, with which it is 

 found in Lake Titicaca ; from the former it differs in length of snout and 

 shapes of head and body, from the latter especially in shape of head, and 

 from both in the squamation of the ventral surface. On one specimen of 

 eight the rays of which were counted, dorsal and anal have each but four- 

 teen rays, indicating a considerable amount of individual variation. 



HAPLOCHILICHTHYS. 



Aplocheilichthys Blkr., 1.862, Poiss. Guin., 116,-1863, Atl., Ill, Cypr.,140. 



Epiplafi/x Gill, l-80;5, P. Phil. Ac. (1862) 136, part. 

 Li/cocypriniis Pet., 1868, Mb. Brl. Ak., 396. 



Corpus elongatum conipressum, squamis magnis deciduis vestitum, dorso 

 humili, ventre convexo. Caput et rostrum latum depressa. Maxilla superior 

 protractilis. Rictus terminalis. Dentes intermaxillares et infraniaxillares 

 uniseriati, simplices ; vomerini nulli. Os supramaxillare post os inter- 

 maxillare rejectum. Pinna dorsalis pauciradiata analis parti posteriori 

 opposita in initio dimidii corporis posterioris inserta. Pinnoe ventrales 

 longe post basin pectoralium insertae Pinna analis media corporis lon- 

 gitudine inserta, pluriradiata, altior quam longa. Apentura branchialis 

 ampla. Membrana branchiostcga radiis 5. (Bleeker.) 



This is Lycocypriuus of Peters, which that author says, in comparing 

 with his Nothobranchius, " ebenfalls freie Nebenkiemen, aber gebogene 

 Zwischenkiefer und cine kurze, ganz hinten liber dem Ende der mittelliui- 

 gen Analllos.se stehende Riickenflosse hat. Er hat ebenfalls die Kiemcn- 

 deckelstiicke deutlich beschuppt und die Zahne der hinteren, so wie der 

 vorderen Reihe etwas grosser." 



