52 



BULLETIN OF THE BUREAU OF FISHERIES. 



Stemias zenostetbus (Gilbert). 



Knowledge of this species liitherto has been based on a single male specimen, the type, dredged 

 north of Unalaska Island. It was found very abundant on Petrel Bank, where numerous specimens 

 of both sexes were obtained. The following additional notes are here presented: 



Measurements, in hundredths of length without caudal, of a male 90 mm, long; Length of head 27; 

 length of snout 7.5; diameter of eye 8; interorbital width 2; distance from tip of snout to end of maxil- 

 lary 11; depth of body at nape 16; least depth of caudal peduncle 3; length of pectoral 23; length of 

 ventral 13. 



In 10 specimens the fin rays are as follows: 



In young individuals, 30 mm. long, the lateral folds equal in number the scutes of the lateral line; 

 with increasing size additional folds are intercalated, one or two of these below each scute. The dense 

 mass of prickly scales on sides of abdomen in males is formed of accessory folds, which arise on the level 

 of the lower axillary region and extend irregularly downward and backward, sometimes reaching 

 median line of belly. This structure is not present in females, which do not produce accessory folds 

 in this region. In females the patch of prickly scales on breast is always reduced in size, and may 

 rarely be almost or wholly wanting. In adult males the mandible protrudes strikingly beyond the 

 premaxillaries and terminates in a strong S3^mphyseal knob. In females the mandible is included 

 within the upper jaw. 



List on vStations. 



Sfelgistrum beringiantun, new species. (Fig. 9.) 



Type 44 mm. long, from station 4777, Petrel Bank, Aleutian Group; depth 43 to 52 fathoms. 



Differing from Stclgistrum stejnegeri in having the snout, cheeks, and opercles naked instead of 

 densely covered with minute scales, and in having the large plates of the dorsal band terminating at 

 the end of the dorsal fin instead of reaching to or nearly to base of caudal; the smaller plates of the 

 band terminate just before end of dorsal. 



Measurements in hundredths of length without caudal fin: Length of head 39; length of snout 12, 

 diameter of eye 11. 5; length of maxillary 17; greatest depth of body 26; depth at front of anal 17; least 

 depth of caudal peduncle 7. 



Dorsal ix, 18; anal 12; pectoral 16; ventral i, 3. Plates in lateral line 38. 



A minute simple filament on maxillary and a few on plates of lateral line; none others have been 

 detected, perhaps because of the small size of the specimens. Maxillarj- short, not extending beyond 

 middle of eye. A deep transverse groove behind nasal spines; interorbital gently concave; no marked 

 ridges or prominences on occiput, its center a trifle depressed. Preopercular spines four, the upper 

 short, simple, directed upward and backward, the lo^^er downward and forward, the other two very 

 short, directed downward and backward. 



Body with four very conspicuous black bars; one from below middle of spinous dorsal downward 

 and forward to axil of pectorals, tapering rapidly, and ending behind upper pectoral rays; one under 

 anterior third of soft dorsal, tapering downward and slightly forward to lateral line, tlience expanding 



