NO. 1 BARNARD: AMPHIPODA OF THE FAMILY AMPELISCIDAE 39 



Ampelisca shoemakeri, new species 

 Plates 27 and 28 



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

 anterior edge moderately incised, lower front edge oblique, convex. 

 Upper portion of head rather compressed laterally. Upper pair of eyes 

 behind upper antennae, lower pair slightly below lateral angle of head. 



Antenna 1 not reaching to end of peduncle of antenna 2 ; article 2 

 of peduncle slightly longer than 1 ; article 3 about half as long as ar- 

 ticle 1. 



Antenna 2: in the material available, the flagella of this antenna 

 are broken ; article 5 of peduncle longer than 4. 



Mandible: spine row with 10 spines; article 3 of palp as long as 

 or longer than 2. 



Maxilla 1 : outer plate armed with 11 spines; article 2 of palp about 

 as wide as outer plate, armed with 4 spines, 3 cusp teeth and 10 setae. 



Maxilliped: inner plate reaching to end of palp article 1, apex 

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

 inner edge lined with 7 chisel teeth, rounded apex with 5 setal spines, 

 the outermost plumose. 



Coxae 1 to 3 : lower posterior angle slit. 



Gnathopod 1 : article 6 about three fourths as long as 5 ; article 7 

 more than half as long as 6 ; posterior edge of article 6 slightly convex. 



Gnathopod 2: article 6 almost two thirds as long as 5; article 7 

 about one half as long as 6. 



Peraeopod 1 : article 4 greatly wider than article 5 ; article 7 about 

 as long as articles 5 and 6 combined. 



Peraeopod 2 similar to 1 but with generic differences. 



Peraeopod 3 : rather stout, article 2 very wide ; posterior edge of 

 article 6 with 2 spines, posterior edge of article 5 with 1 spine. 



Peraeopod 4 stout ; posterior edge of article 5 with 1 spine, posterior 

 edge of article 6 with 3 spines. 



Peraeopod 5 : posterior lobe of article 2, lower edge rounded, extend- 

 ing downward only slightly past end of article 3 ; article 4 subequal to 

 3 in length, posterior edge with a narrow setose lobe; article 6 slightly 

 longer than 5 ; article 7 about as long as 5, slender. 



Uropod 1 : reaching to end of 2 ; peduncle moderately stout ; rami 

 longer than peduncle, outer unarmed, inner ramus with both edges 

 spinulate. 



Uropod 2: rami shorter than peduncle, subequal in length; inner 

 edge of inner ramus and upper edge of outer ramus spinulate. 



