290 PR0CEEDIXG8 OF UNITED STATES NATIONAL MUSEUM. 



tliiit of the suout; tbe bony Y-shaped i)Uite on top of head is mnch 

 vshoi'ter and broader in A. anojyhis, concave on the median line, and forked 

 about half its length. The posterior, undivided p;ut of the Y is broader 

 than long. The bony bridge across the occiput is but little shorter than 

 the part of the head which precedes it. In A. y-gra:eum the Y is forked 

 for less than half its length, the posterior part is more than twice as 

 long as broad, and not concave on the median line; the naked area 

 behind the eyes is trapezoidal, longer than broad, and about 4 times 

 the length -of the snout. The bony bridge across the occiput is not half 

 the length of the part of the head before it. 



The coloration of the A. y-gnccum is somewhat different. The pale 

 spots on the body are larger ; some of them are as large as the pupil, 

 and each surrounded by a narrow ring of black. They extend backward 

 to the end of the soft dorsal, and also cover the lower jaw. The second 

 dorsal is black (the base paler), with two oblique stripes of white; the 

 anal is white with a broad black band ; the caudal black with two white 

 bands, the corners also white; the pectoral brownish, with a broad black 

 shade and a narrow edging of white; the two black blotches on the lower 

 l)arts of the head are present as in A. anoplus, but less distinct. 



OPISTOGXATHID.E. 



101. Opisthognatlius lonchurus sp. nov. (29G71). I". ("SOSW.) 



Head not very large, rounded, and blunt anteriorly in profile; snout 

 extremely short, shorter than pupil ; eye large, 3^ in head ; maxillary 

 IjV in length of head (in specimen 5 inches long), rather narrow at tip, 

 with a ^A•ell-developed maxillary bone; lower jaw included; teeth in 

 both jaws cardi form, forming bands, the outer series enlarged, slender; 

 vomer with o rather large teeth, forming a semicircle; palatines tooth- 

 less ; gill-rakers slender, of moderate length. Longest anal rays 1^ in 

 head; ventrals long, 14 in head; pectoral somewhat mutilated, appa:- 

 rently little more than half head. 



Dorsal spines very slender, the longest about as long as head, slightly 

 higher than soft rays. Caudal long, the middle rays longest, a little 

 shorter than head. Scales entirely destroyed by the digestive i»rocess; 

 head naked. 



Head 3f in length ; depth 4f. D. ca. 25; A. ca. L"). 



Color: head light olive, unmarked; rim of upper lip narrowly black; 

 top of head and back rather darker ; body apparently nearly plain light 

 olive; caudal plain, with traces of three dark bars; breast white; eye 

 dark. 



A single specimen, 5 inches long (No. 29(371, TJ. S.Nat. Mus.),in poor 

 condition (the skin of the body having been digested), taken from the 

 stomach of a lied Snapper, at Pensacola. A second specimen, in the 

 U. S. Nat. Mus. (30712), since forwarded by I\lr. Stearns, has the liead 

 3;^; depth 33; lat. 1. 07. 



