ZooL— Vol. III.] GILBERT— PACIFIC COAST FISHES. 269 



been mistaken for enlarged scales, and the same was doubtless true in Rath, 

 bunella hypoplecta. 



The back is dark brown, nearly uniform, the lower parts light olivaceous, 

 marked with about 8 inverted V-shaped incursions of the brown of the upper 

 parts. In the cotype a faint series of blotches along the lateral line alternate 

 with the V-shaped marks below, and are connected with tliem by oblique 

 lines. Dorsal fin with oblique dark and light crossbars (uniform brown 

 in the cotype); the anal is black, the rays conspicuously white-tipped. The 

 caudal is dusky, the ventrals and pectorals light brown or straw color. 



Two specimens are known, taken on long lines, in Mon- 

 terey Bay. 



The species is named for its discoverer, Mr.W. F. Allen. 



7. Auchenopterus mexicanus new species. 



Plate XXIX. 



Auchenopterus fnonophthalmus ]oxda.n, Proc. Calif. Acad. Sci. 2d ser. 1895, 

 V. 5, p. 501; Mazatlan (not of Giinther). Jordan and Evermann, 

 Fish. N. and M. Amer. pt. 3, 1898, p. 2372 (the description 

 drawn from La Paz specimens, one of which serves as the type 

 of A. 7nexicanus). 



Type: 47 mm. long; no. 6486 Leland Stanford Junior 

 University Zoological Collections; La Paz, L. C; col- 

 lector C. H. Gilbert. 



Specimens of an Auchenopterus from the coast of Mexico 

 at Mazatlan and La Paz agree closely with A . monophthal- 

 mus in coloration and general appearance, but differ con- 

 stantly in the following respects : The first dorsal fin is 

 lower, with stiffer pungent spines; the notch between the 

 dorsals is not so deep; there are fewer scales in the lateral 

 line; the dorsal ocellus is larger, while numerous smaller 

 ocelli (absent in^. monophthalmus') often occur more ante- 

 riorly along the dorsal fin ; the body is deeper; the supra- 

 orbital and nuchal tentacles are larger and more finely 

 divided. 



In A. monophthalmus of equal size, the depth of body is 

 two-ninths to 'one-fifth the length; the lateral line contains 

 forty scales; the membrane between the third and fourth 

 dorsal spines is usually notched to the base, rarely joining 

 fourth spine slightly above its base. 



