NO. 1 BARNARD: AMPHIPODA OF THE FAMILY AMPELISCIDAE 33 



duced ; pleon segment 6, lateral ridges strongly developed ; setal tufts of 

 antennal peduncles typically developed. Length of male, 10 mm. 



Material examined: Stations 250-34 (3), 496-36 (8), 985-39 (1), 

 1026-39 (1), 1140-40 (1), 1131-40 (1), 1160-40 (1), 1168-40 (2), 

 1194-40 (2), 1202-40 (5), 1220-40 (9), 1229-41 (1), 1319-41 (2), 

 1343-41 (1), 1379-41 (1), 1384-41 (3), 1388-41 (5), 1392-41 (1), 

 1396-41 (1). 



Remarks: Holmes failed to mention the presence and the location of 

 the eyes in describing this species. The rami of the third uropods are 

 rather distinctive and easily identify this species in the Eastern Pacific 

 fauna. Ampelisca statenensis K. H. Barnard (1932) appears to resemble 

 it closely but varies in the wider lobe of article 2 of peraeopod 5, the less 

 well developed tooth on pleon segment 3, and the even more greatly 

 inflated rami of uropod 3. 



Distribution: Widely distributed in the Channel Islands off the coast 

 of southern California from Point Fermin south to Laguna Beach, 10 

 to 275 fms; Fraile Bay, Gulf of California, 80 fms; Secas Islands, 

 Panama, 25 fms. 



Ampelisca brevisimulata, new species 

 Plates 23 and 24 



Description of female: Head almost as long as first 3 segments of 

 body, lower front margin subparallel to upper margin, anterior margin 

 nearly straight. Upper pair of eyes near anterior margin of head, above 

 insertion of first antennae; lower pair of eyes at inferoanterior angle of 

 head. 



Antenna 1 reaching beyond end of fourth peduncle article of antenna 

 2 ; article 1 of peduncle tumid ; article 2 slender, almost twice as long as 

 article 1 ; article 3 slightly less than half as long as article 2. 



Antenna 2 more than three fourths the length of the body ; article 5 

 of peduncle three fourths as long as article 4. 



Mandible: spine row with 10 or 11 spines; article 3 of palp two 

 thirds as long as 2. 



Maxilla 1 : outer plate with 10 or 11 spines; article 2 of palp almost 

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



Maxilliped : inner plate reaching beyond end of palp article 2, apex 

 armed with 2 strong chisel teeth, and a single medial, small tooth ; inner 

 margin of outer plate with 8 chisel teeth, rounded apex with 5 setal 

 spines, the outer 3 of which are plumose. 



Coxa 1 with a small tooth ; coxae 2 and 3 without tooth or slit. 



