Jordan and E verm ann. Fishes of North America. 2251 



2583. GILLICHTHYS DETRUSUS, Gilbert & Scofield. 



Allied to Gillichthys mirabilis, Cooper, differing in the broader and 

 more depressed head, the larger anal fin, and greater distance between 

 the 2 dorsals. Head 3; depth 5; eye 7 in head; snout 4; interorbital 5. 

 D. VI-13; A. 11 developed rays (10 in G. mirdbilis) ; scales very fine ante- 

 riorly but becoming much larger posteriorly; about 75 scales from base of 

 pectoral to caudal, and about 25 longitudinal rows between front of anal 

 and front of second dorsal. The head is depressed, the froutals broad, 

 the shortest distance across being contained in the head 8 times (11 times 

 in G. mirabilis.) The postfroutals are small and project but very little, 

 differing from G. mirabllis, where the postfroutals project into an elevated 

 wing-like process. The width of the isthmus contained 3 times in the 

 head; maxillary 1 and mandible If in head. Least depth of caudal 

 peduncle 2f in head. Distance between dorsals equal to % length of first 

 dorsal; length of first dorsal 2 in head; second dorsal 1-J-; anal 2 in head; 

 length of longest pectoral ray If in head. Color a very pale olive, some 

 with dark punctulations about the head and fins. The pale coloration is 

 probably due to their life in shallow water on bottom of pale sand. 

 Gulf of California. The types and numerous other specimens, the longest 

 about 5 inches long, were taken by Dr. C. H. Gilbert at Horseshoe Bend, 

 near the mouth of the Colorado River, in Mexico, where they are quite 

 abundant. These are numbered 3836 in L. S. Jr. Univ. Mus. (detrusus, 

 depressed. ) 



Gillichthys detrusus, GILBERT & SCOFIELD, Proc. TJ. S. Nat. Mus., xx, 1897, 498, pi. 38, Horse- 

 shoe Bend, mouth of Colorado River. (Type, No. 48127. Coll. Gilbert & Alexander.) 



823. QUIETULA, Jordan & Evermann. 



Quietula, JOEDAN & EVERMANN, Proc. Cal. Ac. Sci. 1895, 839 (y-cauda). "*.,_ 



This genus is closely related to Gillichthys, from which it differs in the 

 presence of 2 or 3 cutaneous flaps on the inner edge of the shoulder 

 girdle. Maxillary elongate, as in Gillichthys ; scales rather small, cycloid ; 

 cranium essentially as in Gillichthys. Small gobies living in the mud of 

 lagoons and river mouths. (A diminutive, from quies, quiet.) 



2584. QUIETULA Y-CAUDA (Jenkins & Evermann). 



Head 3 (4); depth 7 (8); eye 3|. D. V-14 or 15; A. 15; scales about 

 50-18 ; B. 5. Body moderately elongate, compressed, narrowing regularly 

 from shoulder girdle to caudal fin; head not greatly depressed, broader 

 than body, its length 4 in body; snout rounded, short, about equal to 

 diameter of eye ; interorbital space narrow, not greater than | diameter 

 of eye ; mouth rather large, its gape extending nearly to vertical of pos- 

 terior margin of orbit; maxillary somewhat variable in length, but 

 usually prolonged behind eye for a distance nearly equal to diameter of 

 eye. Scales small, cycloid, about 50 in longitudinal series, 18 in trans- 

 verse. Teeth in a narrow band on premaxillaries and mandible, short, 

 blunt, and curved slightly backward, most closely set and most numerous 



