2838 Bulletin //, United States National Miisetun. 



1124(b). SIPHOSTOMA STARKSII, Jordan & Culver. 



HeadlO^; depth 21. Dorsal 38, ou + 10 or 11 rings. Rings 13 or 14 + .37 

 or 38. Head and body iu tail 2. Snout 23 in head. Dorsal { longer than 

 head. Body rather stout. Head scarcely carinate above. Snout with a 

 slight smooth carina. Two lateral keels, conllueut into 1 behind. Belly 

 slightly keeled; no keel on opercle. Color dark olive, much mottled 

 with darker but without distinct markings; yellow below. Male and 

 female common in the fresh waters of Rio Presidio at Mazatlau, among 

 alg;e ; not seen in salt or brackish water. The pouch of the male teem- 

 ing with eggs in .January. Length 4 to 6 inches. Mazatlau, Mexico. 

 Common iu the Rio I'residio in sluggish water, on the bottom, about a 

 mile below the village of Presidio. The species is probably found in 

 brackish and fresh waters rather than in the sea. 



Siphostoma starksii, Jordan & Culvek, FLslies Sinaloa, in Proc. Cal. Ac. Sci. 1895, 416, 

 pi. 30, Rio Presidio, Mazatlan. (Type, No. 2686, L. S. Jr. Univ. Mus. Coll. Hopkins 

 Exped. to Mazatlan.) 



1124(c). SIPHOSTOMA SINALOJE, Jordan & Stark.s, now species. 



Allied to Siphostoma atctnm Jenkins & Evermann. 



Head 8^ in length to base of caudal; depth 3^ in head. Dorsal 26, onlA + 

 5 rings, 14 + 35. Snout IJ in head, a strong median ridge above running to 

 between middle of eyes, a ridge on each side from angle of mouth to below 

 eye, occipital and nuchal plates keeled, a slight keel on anterior i^art of 

 opercle ; dorsal keels ceasing in front of the last 4 or 5 rays of dorsal, the 

 lateral ridge running up and continuing as dorsal ridges; belly with a 

 keel on each side. Preanal part of belly If iu postanal part; pectoral 

 shorter than eye, caudal 3 iu head. Color olive brown above, abruptly 

 lighter below lateral ridges anteriorly, the edges of the plates dark, 

 forming reticulations on lower parts of body; between every 4 rings 

 is a narrow white cross l)ar; from each eye is a narrow light bar running 

 upward and backward to occiput; caudal dark. The 2 type specimens, 1 

 of which was sent to the British Museum, collected by the Hopkins 

 Expedition at Mazatlan. They were erroneously referred to Siphostoma 

 arctum in our paper on the Fishes of Sinaloa. Type, No. 2945, L. S. Jr. 

 Univ. Museum. 



Page 772. Corylhruichthys, Kaup, should apparently be recognized as 

 a genus distinct from Sijihostovia. The species belonging in it ai'c the 

 following: 



1134, €OUYTHROICHTHYS ALBIROSTRIS, Heckel. 



11.35. CORYTHROICHTHYS CAYANXENSIS (Sauvagc). 



1135(a). CORYTHROICHTHYS CAYOKUM, Evermann & Kendall. 



Head 8f ; depth 12f ; snout 3t m head; eye 4^. D. 21 rays, on lA + 3i 

 rings; A. 3, on first caudal ring; C. 10; P. 10. Rings 17+26 = 43. Body 

 short and stout; head short, snout very short; tail but little longer than 

 head and trunk. Cranial ridges strong; a high, sharp keel on snout, the 

 occipital keel very high, its edge convex, notched near the middle, not 



