H0.1115. PROCEEDINGS OF THE NATIONAL MUSEUM. 439 



Pectoral spiue li in liead, serrate, the serriie on inner edge larger and 

 sharper than those on outer, the npi)er anterior serne tuberele-like; 

 the rays a little longer than spine. Bluish silvery, light yellowish 

 below ; top of head and back brown. Fins dnsky olive, lighter at base; 

 all margined with darker; veutrals not black; similar in color to other 

 tins; adipose tin covered with minute bhick dots. Maxillary barbels 

 dark brown, with bluish silvery luster; other barbels lighter. Eye 

 yellowish. Length 7^ to 9 inches. 



Type.—^o, 47584, U.S.^.M. 



Six specimens from San Juan Lagoon, near the mouth of liio Ahome, 

 Sonora, Mexico. 



NETUMA INSULARUM, Flora Hartley Greene, new species. 



Head in length 3|; width of head in length 4f; interorbital space 

 in length 7; interorbital space in head scarcely 2; snout in head 3; 

 breadth of mouth in head 2; eye in head G|; dorsal I, 7; anal 17. 



Head much broader than deep; snout depressed and broadly rounded; 

 eye above the level of the mouth. Upper jaw projecting. Teeth on 

 vomer and palatines villiform and bluntly conical. The 2 vomerine 

 patches forming together a band almost as long and slightly broader 

 than the premaxillary band; the 2 sides separated by a narrow inter- 

 space. Palatine teeth well separated from the vomerine teeth and in 2 

 large triangular patches which extend backward over the pterygoid 

 region. Each triangle has a sharj) notch in its anterior side; its 

 anterior- posterior length is twice its lateral width. Teeth of lower jaw 

 in a narrower band than the upper jaw. Maxillary barbel extending 

 to end of first third of the length of the pectoral spine; outer mental 

 barbel to base of pectoral; inner mental barbel past gill opening, 2^ 

 in head. Dorsal shield crescent-shaped, without median keel. Lengtli 

 on median line 25 in distance between the horns of the crescent; 2 

 notches on its anterior side to meet the corresponding points from the 

 occipital process. Occipital process broadly triangular, with the outer 

 sides concave and 2 small projections at its posterior end. Median 

 keel evident, rather short. Occipital process much broader at base 

 than long; its length 3i in head; posterior breadth 2 in length of proc- 

 ess. Fontanelle broad and shallow, narrowed gradually posteriorly 

 to a point halfway between snout and base of dorsal spine, A nar- 

 row line runs back from it the distance of a long diameter of the eye. 

 Greatest width of the fontanelle equals the short diameter of the eye. 

 Shields of the head granular striate, the striiie evident and extending to 

 the middle of the interorbital space, and on the side to meet the humeral 

 process at the top of the gill opening. Opercles nearly smooth. Gill 

 membranes forming a fold across the isthmus. Dorsal and pectoral 

 sitines crenulate in front and sharply retrorse serrate behind. Dorsal 

 shorter than pectoral, which is 1^ in head. No axillary pore evident. 

 Adipose fin long and low with posterior margin attached. Yent much 

 nearer ventrals than anal. 



