NO. 1 BARNARD: AMPHIPODA OF THE FAMILY AMPELISCIDAE 23 



Telson: lobes apically rounded, each armed with a seta; dorsal 

 surface of each lobe armed with 2 or 3 setae along inner edge. 



Pleon segment 3 : posterior edge slightly convex, lower posterior 

 angle rounded. 



Pleon segment 4: dorsal posterior surface raised into a large hood- 

 shaped hump which is nearly cristate at its apex. 



Pleon segment 6: lateral ridges very small. 



Male: Unknown. 



Types: Holotype, AHF no. 3912, ovigerous female, 5.5 mm; para- 

 types, 4 ovigerous females. 



Type locality: Station 964-39, Tenacatita Bay, Mexico, 2 to 8 fms. 



Material examined: Five ovigerous females and 3 females from the 

 type locality. 



Remarks: See Ampelisca vera, new species, below, for a discussion 

 of this species. 



Distribution : Known only from the type locality. 



Ampelisca vera, new species 

 Plates 14, 15 and 16 



Description of male: Head nearly as long as first 3 body segments, 

 anterior edge moderately incised, rostrum not strongly developed ; lower 

 front edge of head convex, oblique. Upper pair of eyes rather small, be- 

 hind upper edge of antenna 1 ; lower pair at lateral angles of head, 

 larger than upper pair. 



Antenna 1 longer than peduncle of antenna 2, stout; article 2 of 

 peduncle slightly longer than 1 ; article 3 short. 



Antenna 2 about as long as body; articles 4 and 5 of peduncle sub- 

 equal in length. 



Mandible : spine row with 1 1 spines ; article 3 of palp nearly as long 

 as article 2. 



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

 nearly as wide as outer plate, apex with 4 spines, 3 cusp teeth and 8 to 

 10 setae; inner plate rather long, conical. 



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

 2 chisel teeth ; outer plate reaching to end of palp article 2, inner edge 

 with 8 chisel teeth, rounded apex with 4 or 5 setal spines. 



Coxae 1 to 3 without a slit at lower posterior angles, although a 

 single seta is set in a notch. 



Gnathopod 1 : article 6 shorter than article 5 ; article 7 two thirds as 

 long as 6 ; posterior edge of article 6 nearly straight. 



