218 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.9 



Dorsal fin light buff, enclosing elongate, grayish areas close to base of fin. 

 Anal fin colorless or faintly shaded with brown posteriorly. Caudal fin 

 light, with two wide dark cross-bars. Ventral fins pale. Pectoral fins 

 pale distally, somewhat darker basely, with traces of two or three 

 obliquely curved bars. Base of humeral spines with a wide, black band. 



Kathetostoma ornatus is most closely related to K. averruncus from 

 the west coast of Colombia, South America, but differs from that species 

 in the increased number of dorsal rays, more slender body, and narrower 

 premaxillary groove and interorbital. The mandibular teeth of ornatus 

 are mostly in a single series, while in averruncus they are in two series 

 with the inner row enlarged. Also, the vomerine teeth are smaller and 

 more abundant in ornatus and the palatine teeth are smaller; the snout in 

 relation to the eye is longer, the dorsal base is longer than the anal base, 

 and the distance between the humeral spines is equal to and not longer 

 than the top of the head. The color pattern also differs somewhat in 

 ornatus. 



From Kathetostoma albigutta this new species differs by having fewer 

 anal than dorsal rays, vomerine teeth not in a villiform band, more pos- 

 teriorly inserted ventral fins, and numerous other characters. The fewer 

 dorsal and anal rays, and the absence of bands of teeth on the vomer and 

 palatines distinguish K. ornatus from K. laeve. 



Gobiidae 



Genus GOBIOSOMA Girard 



Gobiosoma Girard, 1859, p. 169 (type by subsequent designation 

 Gobiosofna bosci Lacepede=G. molestum Girard). 



Dorsal VII — 1 1 to 14, dorsal spines very seldom one more or less than 

 seven. Anal 10 to 13 ; dorsal normally with two (sometimes three) more 

 rays than anal (subgenus Elacatinus in equal number). First dorsal 

 spine not prolonged (except in subgenus A^^^^ where the first dorsal spine 

 of the male is greatly prolonged beyond the following spines). All 

 pectoral rays connected by membrane. Ventral fins completely united, 

 free from abdomen, interspinal membrane well developed. Caudal fin 

 short, rounded or truncate. 



Scales entirely absent or two ctenoid scales present at base of caudal 

 fin. Teeth in jaws in bands, outer series of both jaws enlarged (except in 

 lower jaw of subgenus Elacatinus). Inner series of lower jaw, and in 



