394 PROCEEDINGS OF THE NATIONAL MUSEUM vol. im 



who collected a number of specimens of this amphipod in the harbor 

 at that time. 



In addition to the specimens taken by Dr. Dall, a single specimen of 

 this species was taken by W. G. Hall in 1872 at Nagai Island, another 

 of the larger islands of the Rat Island group. 



Family Stenothoidae 



Metopa stelleri, new species 



Figure 2 



Male. — Head not quite as long as first 2 body segments combined; 

 lateral lobe broadly rounded. Eye medium size, round, very light 

 straw-colored in alcohol. Antenna 1 nearly as long as antenna 2, 

 which is nearly as long as body. Antenna 1, first joint longer than 

 second, which is about 5 times as long as third; flagellum longer than 

 peduncle and composed of about 25 joints. Antenna 2, third joint 

 about Yz as long as fourth, which is about as long as fifth; flagellum 

 little more than ){ length of fifth peduncular joint, composed of about 

 11 joints, first of which almost as long as remaning joints combined. 

 Mandible normal, spine row of 15-16 spines; palp with very small third 

 joint. Maxilla 1 normal, palp 1-jointed. Maxilla 2 normal; inner 

 lobe much shorter than outer. Maxilliped with characters of genus. 

 Gnathopod 1 slender, second joint slightly expanded, without lobes, 

 nearly as long as fifth and sixth joints combined; fifth joint about as 

 long and as wide as sixth; sixth joint slightly expanded distally, palm 

 oblique, straight, bearing very fine short spinules throughout, no 

 defining spines, but row of long slender spines on rounding margin, 

 where palm merges into hind margin of joint (fig. 2d); seventh joint 

 fitting palm, armed on inner margin with very fine teeth and short 

 spinules. Gnathopod 2 large, strong; second joint not as long as 

 sixth, with rounding lobe on lower front margin; fifth joint less than 

 ){ as long as sLxth, with lobe between fourth and sixth joints; sixth 

 joint large, strong, front and hind margins convex, palm very oblique, 

 convex, armed with irregular low teeth and defined by tooth bearing 

 slender spine on its inner margin; seventh joint stout, sHghtly shorter 

 than palm and bearing minute setules on inner margin. 



Pereopod 1 long, slender. Pereopod 2 not as long as pereopod 1, 

 but stouter. Pereopod 3 longer than pereopods 4 or 5, which are 

 subequal in length; second joint slender, without lower lobe. Pereo- 

 pods 4 and 5 strong; second joint broadly expanded; fourth joint 

 large, broadly expanded with hind margin produced shghtly beyond 

 end of fifth joint. Seventh joints of pereopods 1-5 rather short, 

 stout, wiih inner margins bearing very low forward-pointing teeth 



