362 On Fishes from Sjuthern Mexico. 



Below I describe a new Cvtylopus and make some remarks 

 about Pseudoxiphophorus biniaculUu-i and P. pauciradiatus. 



Cotylopus punctatus, sp. n. 



Depth of body 6| in the length, length of head 5^. Snout 

 14 as long as eye, the diameter of which is 5^ in the length 

 of head and 1;^ in tiie width of the osseous interorbital space. 

 Lower jaw shorter than the upper ; maxillary extending to 

 below posterior border of eye. Dorsal VI, I 10 ; all the rays 

 of the spinous dorsal, except the first, produced as filaments, 

 the fourth the longest, when laid back extending beyond the 

 middle of the second dorsal ; rays of the second dorsal in- 

 creasingin length posteriorly, tlie last, when laid back, reaching 

 the caudal. Anal I 11, opposite to the second dorsal ; last 

 anal ray, when laid back, extending | of the distance from 

 its base to the caudal. Pectoral a little longer than the head ; 

 ventral § the length of head. Caudal rounded. 95 scales in 

 a longitudinal series, 25 between second dorsal and anal fins ; 

 abdomen with a median naked area extending forward from 

 the vent. Caudal peduncle If as long as deep. Head 

 covered with small dark spots ; each scale on the body 

 bearing a similar spot ; very small dark spots on the dorsal 

 fins and on the base of the pectoral. 



A single specimen, 132 mm. in total length, from 

 Tequesistlan. 



'I'he outer series of teetli of the lower jaw are completely 

 concealed in a fleshy pad ; but examination of other species 

 of Cotf/lopus and Sicydium shows that the extent to which 

 these teetii are exposed varies considerably and that this 

 feature must not be regarded as characteristic of the species. 



Pseudoxiphophorus pauciradiaius, Regan. 



Dr. Meek regards this sp cies as a synonym of Pseudo- 

 xiphojihorxis himaculatus, Heck., but it seems probable that 

 he lias seen specimens of the latter species only. 



1 have examined a large number of specimens of Pseudo- 

 xi}>hophoriis himaculatus from Southern Mexico, Guatemala, 

 and British Honduras. The number of rays in the dorsal 

 fin is usually 15, but varies from 14 to 17, whilst the head, 

 snout, and caudal fin appear to be slightly, but constantly, 

 longer and the anal fin considerably deeper than in P. pauci- 

 radiatus. Of tiiis latter species I have seen the eight typical 

 exam[)les from Orizaba and six others collected by Dr. Gadow *, 



» Of six specimens of P. pauciradiatus from Orizaba, collected by 

 Dr. Gadow, one has 13, three have 12, and two have 11 dorsal ravs. Of 



