26 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.18 



Isla Partida, Angel de la Guardia Island, San Esteban Island, Tiburon 

 Island, and Angeles Bay, 8 to 75 fms ; south of White Friars Islands and 

 Tangola Tangola Bay, 25 fms ; off San Jose Point, Guatemala, 20 fms ; 

 Costa Rica at Salinas Bay, Port Parker, and Cocos Bay (south of Port 

 Culebra), 2 to 20 fms; Panama at Bahia Honda and Pinas Bay, 5 to 20 

 fms; Octavia Bay and Port Utria, Colombia, 30 to 50 fms; Salango 

 Island and Cape San Francisco, Ecuador, 2 to 12 fms. 



Ampelisca cristata Holmes 



Plates 17 and 18 



Ampelisca cristata Holmes (1908), Proc. U.S. Natl. Mus., vol. 35, pp. 

 507-508, figs. 16, 17. 



Description of female: Head as long as first 3 segments, front margin 

 of head slightly incised, lower front margin parallel to upper margin of 

 head. Upper pair of eyes near anterior margin of head, lower pair at 

 lateral angle of head. 



Antenna 1 short, reaching almost to end of peduncle of antenna 2 ; 

 article 1 tumid, not as long as article 2 ; article 3 about half as long as 2. 



Antenna 2 about the length of the body; article 5 of peduncle two 

 thirds as long as 4. 



Mandible: spine row with 13 to 15 spines, article 3 of palp shorter 

 than second. 



Maxilla 1 : outer plate armed with 10 spines; article 2 of palp nearly 

 as large as outer plate, apex with 5 spines, 5 cusp teeth and 15 to 17 

 setae. 



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

 2, apex with 3 chisel teeth ; outer plate reaching to end of palp article 2, 

 inner margin with 12 chisel teeth, rounded apex with 7 to 9 spines and 

 setae, the outer three of which are plumose. 



Coxa 1 : lower posterior angle with a tooth, coxae 2 and 3 without 

 tooth or slit. 



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

 one half as long as 6. Posterior margin of article 2 lined with small 

 spinules. 



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

 long as 6; article 2 as in gnathopod 1. 



Peraeopod 1: coxal plate not narrow at distal end as figured by 

 Holmes (1908, fig. 16) ; article 2 lined with spinules as in gnathopods 

 1 and 2; article 7 nearly twice as long as articles 5 and 6 combined; 

 anterodistal angle of article 4 produced. 



