No. 2392. NEW DEEP-SEA FISHES FROM HAWAII— JORDAN. 655 



no spots or reticulations; a dark area below eye; both dorsals narrowly 

 but sharply edged with black; caudal blackish at base and tip; pec- 

 toral black with a narrow white edge, the middle paler, lower parts 

 pale. 



PERISTEDION GILBERTI, new species. 



Peristedion engyceros Gilbert, Deep Sea Fishes of the Hawaiian Islands, 1905, 

 p. 639, Coasts of Oahu, Maui, Kauai, and Laysan Islands, 178 to 305 fathoms. 



The specimens examined by Dr. C. H. Gilbert, with the one excep- 

 tion noted above, belong to a distinct though closely related species. 

 Comparing these with Peristedion engyceros I note the following 

 differences : 



Prolongations on snout, rigidly parallel, a little longer than in P. 

 engyceros; the preopercular spine If in their length; interorbital 

 width a little less than vertical diameter of eye; ventrals barely 



Fig. 8. — Prolongation on snout of (a) peristedion engtxeros gOnther contrasted 



WITH THAT OF (6) P. GILBERTI, NEW SPECIES. 



reaching front of anal ; pectorals also a little shorter, reaching to fifth 

 or sixth lateral plate. 



No dark bars anywhere on body or fins. In the largest example 

 the body and fins are all pale, alike, no doubt pink in life. All the 

 other examples have the upper parts marked with small olive spots 

 regularly arranged, these giving place on the head to symmetrical 

 fine olive streaks. In some, the pectoral and caudal are more or less 

 specked with olive, in others quite plain. (Cat. No. 84102, U.S.N.M.) 



The following is Doctor Gilbert's description of Peristedion engy- 

 ceros, (not of Giinther) : 



Length of head, measured from front of premaxillaries to opercular margin, 2.5 

 in length from front of premaxillaries to base of caudal; depth, 5.75; greatest width 

 of head, 3.65. D. vii, 20 (rarely 21); A. 20; P. 14X2. 



The species differs strikingly from P. Mans in the shape of the rostral processes, 

 which are very slender, parallel, of nearly equal width throughout; the distance 

 between them equals their length and is about half length of snout without them; 

 width of the snout opposite anterior nostril equal to its length; interorbital space 

 deeply concave, with a median groove, which widens posteriorly; a small postocular 

 spine, a much stronger spine at end of occipital ridges, and small spines at end of 

 paroccipital opercular crests; upper orbital rim spinulose along its entire length; 

 in the young are usually two preorbital spines which disappear in adults; behind 



