NO. 1 BARNARD : AMPHIPODA OF THE FAMILY AMPELISCIDAE 49 



Ampelisca pugetica Stimpson 

 Plates 35 and 36 



Ampelisca pugetica Stimpson (1864), Proc. Acad. Nat. Sci. Philadel- 

 phia, vol. 16, pp. 158-159. 

 Ampelisca calif ornica Holmes (1908), Proc. U.S. Natl. Mus., vol. 35, 

 no. 1654, pp. 513-515, fig. 23. 



Description of female: Head not as long as first 3 body segments, 

 anterior edge of head incised, lower front margin of head oblique, nearly 

 straight. Upper pair of eyes behind first antennae, lower pair on oblique 

 margin. 



Antenna 1 variable in length, reaching to middle of peduncle article 

 5 of antenna 2 or beyond end of peduncle of antenna 2, depending on 

 the age of the specimens; first article of peduncle tumid, more than 

 half as long as article 2 ; article 3 half as long as article 2. 



Antenna 2 about the length of the body ; article 4 of peduncle longer 

 than article 5, or nearly subequal to it in some adults (14 mm). 



Mandible: spine row with 11 or 12 spines; article 3 of palp slightly 

 more than half as long as article 2. 



Maxilla 1 : outer plate with 1 1 spines ; article 2 of palp almost as 

 large as outer plate, armed with 4 spines, 4 cusp teeth and 9 to 12 setae. 



Maxilliped: inner plate not quite reaching to middle of palp article 

 2, apex with 2 chisel teeth ; outer plate reaching to end of palp article 2, 

 inner margin with 11 chisel teeth, rounded apex with 6 spines and 

 setae, the outer 2 of which are plumose. 



Coxae 1 and 2: lower posterior angle slit, coxa 3 without a slit. 



Gnathopod 1 : article 6 about two thirds as long as 5, article 7 about 

 one half as long as 6. 



Gnathopod 2: article 6 about half as long as 5, article 7 less than 

 half as long as 6. 



Peraeopod 1 : article 7 half again as long as articles 5 and 6 com- 

 bined ; anterodistal angle of article 4 produced. 



Peraeopod 2 similar to 1 but with generic differences. 



Peraeopod 3 : posterior margin of article 5 with 3 sets of spines, 

 posterior margin of article 6 with 4 spines. 



Peraeopod 4: posterior margin of article 5 with 3 sets of spines, 

 posterior margin of article 6 with 1 or 2 spines. 



Peraeopod 5 : inferior margin of posterior lobe of article 2 rounded, 

 extending down beyond end of article 3 ; article 2 rather short, articles 

 3 and 4 subequal in length, article 4 with a large, posterior, setose lobe ; 

 articles 5 and 7 subequal in length, shorter than article 6 ; distal anterior 

 margin of article 6 notched. 



