2774 Bulletbi //, United States National Museum. 



of its sides. Occipital process subtri angular, not quite as long as broad 

 at base, with a strong median keel, its sides slightly curved. A short 

 distance in front of the beginning of the keel is the end of the very nar- 

 row groove-like fontanel, which is somewhat widened anteriorly, finally 

 merging into the broad, Hat, smooth interorbital area, the boundaries of 

 which are not well detined ; shields of head unusually smooth, all finely 

 and very sparsely granular, the granules not forming distinct lines. Some 

 specimens (probably females) about as smooth as in the subgenus GaAe,- 

 ichthys. Gill membranes forming a rather broad fold across isthmus. 

 Dorsal spine long, usually, but not always, shorter than the jiectoral 

 spine, about 1| in head; axillary pore absent; humeral jirocess rather 

 broadly triangular, not much produced backward, less than i length 

 of pectoral spine, its surface not granular, covered with skin; adipose 

 fin I length of anal, its posterior margin little free; upper lobe of 

 caudal the longer and somewhat falcate, about as long as head; ventrals 

 long, about reaching anal in females, rather shorter in males; vent much 

 nearer base of ventrals than anal. Color olive green, with bluish luster, 

 white below; upper fins dusky olivaceous; caudal yellowish dusky at 

 tij); anal yellowish with a median dusky shade; ventrals yellowish, the 

 basal half of upper side abru})tly black; pectorals similarly colored, the 

 black area rather smaller; maxillary barbel blackish; other barbels pale. 

 Length 12 to 18 inches. Coast of Sinaloa; very common; by far the most 

 abundant species at Mazatlan; not recorded from localities farther south. 



Arius assimilis, Jordan & Gilbert, Bull. IT. S. Pish Conim., ii, 1882, 47; not of Gunther. 

 Qaleichthys gilberti, Jordan & Williams, Kept. Fishes Sinaloa, in Proc. Cal. Ac. Sci. 1895, 

 395, pi. 26, Mazatlan. (Type, No. 29213. Coll. Chiis. H. Gilbert.) 



188. (ULEICHTHYS JOUDANI (Eigenmann & Eigenmann). 



Head 3? to 3*; depth 5i to .5g. D. I, 7; A. 18; eye large. If in snout, 

 5^ in head, 2 in the interorbital, 2f to 3 in the interocular. The specimens 

 agree very closely with the description of assiw (7(8 by Jordan & Gilbert 

 {(jilherti of the present paper). They differ in the width of the mouth 

 and in having a pectoral pore. Rather robust, the width little less than 

 the depth; caudal peduncle compressed. Head heavy, little broader than 

 high, its height li in its length, its width 1| to 1^, width at the angle of 

 the mouth 2 to 2J; interorbital area flat and smooth; posterior portion 

 of the head finely and sparsely granular ; opercle and humeral process 

 smooth ; occipital process about as long as broad, unustially sharply 

 keeled; fontanel extending to above the posterior part of the orbit, con- 

 tinuing as a deep groove to the base of the occipital process; maxillary 

 barbels extending to the jiectoral pore, postmentals at least to the gill 

 opening, mental about f as long as the postmental barbels; snout blunt, 

 decurved; upper jaw a little produced; teeth all villiform, those on tha 

 vomer forming 2 small, separate, ovate patches, which are contiguous to 

 the twice or thrice as large palatine patches; gill membranes forming a 

 fold across the isthmus; gillrakers 6 -f- 9 ; pectoral pore largo; vertical 

 series of pores present ; distance of dorsal spine from tip of snout 2'} to 2f 

 in the length; the spine of the dorsal and jjectoral fins granular on the 



