2838 Bulletin j, United States National Museum. 



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



Head 10; depth 21. Dorsal 38, on -{- 10 or 11 rings. Rings 13 or 14 -{-37 

 or 38. Head and body in tail 2. Snout 25 in head. Dorsal longer than 

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

 slight smooth carina. Two lateral keels, confluent 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 Mazatlan, 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. Mazatlan, Mexico. 

 Common in the Rio Presidio 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. 



Sipkostoma starksii, JORDAN & CULVER, Fishes Sinaloa, in Proc. Cal. Ac. Sci. 1895, 416, 

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

 Expetl. to Mazatlan.) 



1124(c). SIPHOSTOMA SINALOJE, Jordan & Starks, new species. 



Allied to Siphostoma arctum Jenkins & Evermann. 



Head 8 in length to base of caudal ; depth 3 in head. Dorsal 26, on 1 -f 

 5 rings, 14 -}- 35. Snout 1J 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 part 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 in postanal part ; pectoral 

 shorter than eye, caudal 3 in 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 bar; 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. Corythroichthys, Kaup, should apparently be recognized as 

 a genus distinct from Siphostoma. The species belonging in it are the 

 following : 



1184. CORYTHROICHTHYS ALBIROSTRIS, Heckel. 



1135. CORYTHROICHTHYS CAYAKNENSIS (Sauvage). 



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



Head 8jh depth 12f ; snout 3 in head; eye 4. D. 21 rays, on l| + 3 

 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 



