49 CYPRINODONTIDyE ZYGOXECTES. 341 



553. Z. dispar* Agassiz. 



Body short and deep, much compressed. Head short and very broad, 

 the flat iiiterorbital space being two-thirds of its length, and barely twice 

 the diameter of the eye 5 the distance between the eyes above greater 

 than the distance between them/below. Snout broadly rouuded. Fins 

 moderate; dorsal much smaller than anal. Outer series of teeth some- 

 what enlarged. Coloration pale olive, bluish in life; a very distinct 

 brownish line along the edges of each row of scales, appearing wavy or 

 serrated as it follows the scales; about 10 of these longitudinal stripes 

 are present; males with the lines interrupted, appearing as series of 

 dots and further marked by about 9 dark cross-bars; adults with a dark 

 blotch below the eye, sometimes confluent with it. Oviduct free from 

 anal, Head 3f; depth 3i. D. 7; A. 9; scales 35-10. L. 2^ inches. 

 Lakes and sluggish streams from Ohio to Iowa. 



(Agassiz, Amer. Jour. Sci. Arts, 1854, 353; Jordan, Proc. Acad. Nat. Sci. Phila. 

 1877, G7.) 



554. 55. brachypterus Cope. 



" Base of the first dorsal ray behind the vertical line equally dividing 

 the base of the anal; ventrals not reaching base of anal. Scales large. 

 Head wide, with overhanging supercilia ; interorbital width twice the 

 diameter of the orbit, which enters the length of the head 2.J times. 

 Color uniform olivaceous, the scales with brown edges; cheeks silvery; 

 no spots on the head. Body stout. Head 4. D. 7; A. 8. Scales 

 30-9. Length 2." (Cope, MSS.) Trinity Eiver and other streams in 

 Texas. 



* Professor Agassiz, Amer. Journ. Sci. Arts, 1854, 353, mentions three more species of 

 this genus, which have not since been recognized, besides two (Z. lateralis and Z. zona- 

 tus) which are evidently identical with Z. notatus, and another, Z. lineolatus, which 

 Professor Putnam informs us is identical with Z. nottii. 



Z. nottii Agass. 



''The darker continuous longitudinal lines alternate with fainter interrupted ones. 

 Males with distinct transverse bauds ; dark olive above, fading upon the sides ; sil- 

 very below. Operculuin, throat, and space in advance of the eye orange color." Mo- 

 bile, Ala. 



Z. guttatus Agass. 



"A large dark spot upon the centre of each scale on the back and sides, forming 

 longitudinal rows of disconnected dots. The transverse bars of the male are much 

 narrower and nearer together than in Z. lineolatus (nottii'). Dark olive above, fading 

 upon the side. Abdomen silvery." Mobile, Ala. 



Z. liieroglyplricus Agass. 



"Anterior and upper parts of the body sprinkled with dark dots, passing into longi- 

 tudinal rows backwards. Light olive above ; silvery on the sides and below." Mo- 

 bile, Ala. 



