Jordan and Evermann. — Fishes of North America. 2251 



2583. GILLICHTHIS DETRUSUS, Gilbert & Scofield. 



Allied to (riUichihys mirahilis, Cooper, diftering iu the broader and 

 more depressed bead, tbe larger anal lin, and greater distance between 

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

 D. VI-13; A. 11 developed rays (10 in G. mirahilis); scales very tine 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 frontals broad, 

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

 in G. mirahilis.) The postfrontaLs are small and project but very little, 

 diftering from G. miraMlis, where the postfrontals 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 2^- iu head. Distance between dorsals equal to ^ length of first 

 dorsal ; length of first dorsal 2^ in head ; second dorsal 1^ ; anal 2 in head ; 

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

 with dark pnnctulations al)Out the liead and fins. The i)ale ctdoration 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. {detrnsus, 

 depressed.) 



G-illichlhyx detrusus, Gu-bekt & Scofield, Pioo. U. S. Nat. Mus., xx, 1807, 498, pi. 38, Horse- 

 shoe Bend, mouth of Colorado River. (Type, Xo. 48127. Coll. Gilbert & Alexander.) 



823. QUIETULA, Jordan & Evermann. 

 Qwietula^ Jordan & Evebmann, Proe. Cal. Ac. Sci. 1895, 839 (y-cauda). ^ ., 



This genus is closely related to Gillichtlujs, from which it diff^ers in the 

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

 girdle. Maxillary elongate, as in Gillichthi/s ; scales rather small, cycloid; 

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

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



2584. QUIETULA \'-CAUI)A (.Jenkins & Evemiauu). 



Head 3i (4); depth 7 (8); eye 3L 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 i diameter 

 of ej'e; mouth rather large, its gape exteudiug 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 iu trans- 

 verse. Teeth iu a narrow baud on premaxillaries and mandible, short, 

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



