326 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY - IV. 



(i in head. Tin- pectoral reaches half way In the dorsal. The color is precisely as de~ 

 siTihcd |'..r rorniititx, except thai tin- middle stripe is decidedly paler than the grouml 

 color of the body, hut darkei- mi i in- head, the change being abrupt at the c>pen-ular 

 margin. Tin- caudal liu is dark In-own, wiih s -vcr.il veri ieal rows of \vhiie specks or 

 Idotches running across the rays. The anterior part of the dorsal is similar in color, 

 lut paler. Total length a trille over an ineli. A scale from the region mentioned hy 

 rntnain is similar to that of ir/nxxizi, but with 5 orb' concentric lines and :5 radiating 

 furrows. 



The specimen thus agrees with roriintiiH in position of eye and plan of markings, 

 with (f;/.sW;( in length of pectorals and siriicture of scales, is intermediate in length 

 of head, and agrees with neither in color of caudal and dorsal and tint of middlo 

 band, (I'orbcH, in lit. November -1, 



FAMILY XLIX. CYPRINODONTID^E. 

 (The Cyprinodonts.) 



Body oblong or moderately elongate, compressed behind, depressed 

 forwards, covered with rat her large cycloid scales, which are adherent 

 and regularly arranged. X'o lateral line. Head scaly, at least above. 

 Mniitli terminal, small, the lower jaw usually projecting; margin of the 

 upper jaw formed by the preinaxillaries only; premaxillaries strong, 

 extremely protractile. Teeth incisor-like or villiform, sometimes present 

 on the vomer, but usually in the jaws only; lower pharyngeals sepa- 

 rate, with canliform teeth. Gill-membranes somewhat connected, free 

 from isthmus; gill-rakers very short, thick. Branchiostegals 4-6. 

 r.-endobranehite none. Dorsal flu single, inserted posteriorly, of soft 

 rays only, rarely with a single spine or a rudimentary spinous dorsal; 

 caudal iin not forked: ventral (ins abdominal, rarely wanting; pectoral 

 lins inserted low; no adipose Iin. Stomach not ccecal, without pyloric 

 appendages. A ir-bladder simple, often wanting. Sexes usually unlike, 

 the tins being largest in the males. Most or all are ovoviviparous, 

 the young well developed at time of birth. I-Ycsh-water fishes of South- 

 ern Fjirojie, Asia, Africa, and America, some of them occurring in bays 

 and arms of the sea. They are most ly of small si/.e, and the species are 

 very clinical! of determination. (J-enera .'JO; species about 1-10. 



(('i/liriniiilititliili:' (liinlher, vi. 'J'.U-:;.">(;.) 



NuTK. In the following analysis the genera known from Mexico an- also included, 

 their name-, I.ein^ placed in it 



* Intestinal canal com para I i\ely short, lit I le convoluted ; teeth mostly lixcd ; dcntary 



hones firmly joined, (f'nntintrir.') 

 a. Anal iin of the male not modified into an inl romil teni or^an. 



6. Te.'th iiK-isor-like, notched; insert ion of dorsal nearly opposite vcntrals. (Cy- 



{iriiiixloiitin 

 C. Teeth in a single series; hody short and deeji. 



rf. Dorsal ver\ IOIILT. with K'.-l- rays, the first spine-like. . . JoRDAXKLLA, 15G. 

 dd. Dorsal short, of 10-11 rays, the lirst ray small ......... CYPIILNODON, 157. 



