NO. 1 BARNARD: AMPHIPODA OF THE FAMILY AMPELISCIDAE 25 



Types: Holotype, AHF no. 345, male, 9 mm; paratype, male, 9 mm; 

 allotype, female, 10 mm. 



Type locality: Cultus Bay, Whidbey Island, State of Washington, 

 May 30, 1934, collected by J. E. Lynch and W. Mel. Chapman, muddy 

 bottom of intertidal. 



Material examined: Stations 113-33 (1), 116-33 (44), 214-34 (1), 

 236-34 (1), 259-39 (2), 264-34 (1), 396-35 (2), 421-35 (2), 429-35 

 (4), 431-35 (1), 432-35 (1), 443-35 (12), 468-35 (14), 470-35 (3), 

 475-35 (15), 476-35 (52), 477-35 (3), 480-35 (2), 481-35 (30), 

 555-36 (1), 556-36 (1), 558-36 (5), 562-36 (1), 564-36 (27), 572-36 

 (1), 702-37 (3), 734-37 (8), 769-38 (1), 1055-40 (2), 1131-40 (1), 

 1140-40 (1), 1168-40 (1), 1169-40 (1), 1191-40 (1), 1202-40 (1), 

 1229-41 (2), 1245-41 (1), 1294-41 (1), 1328-41 (1), 1359-41 (3), 

 1373-41 (1), 1384-41 (7), 1390-41 (1), 1418-41 (9), 1965-50 (7), 

 2026-51 (39), and 27 specimens from type locality. 



San Quintin Bay, Lower California, dredged in shallow water, 

 April 6, 1950, collected by R. J. Menzies (14). 



Remarks: In young females the head is not produced so far forward 

 as in the figured specimen. The female differs from the male in the shape 

 of the head, the weaker process of pleon segment 4, and the shorter an- 

 tennae and armature of uropod 3. 



The male of this species might easily have been described as the un- 

 known male of Ampelisca cucullata, new species, but is placed with the 

 herein described females on the basis of the rostral portion of the head 

 and by the association of males and females in the Whidbey Island 

 material. The females of Ampelisca vera and A. cucullata, new species, 

 are distinguished by the shape of pleon segment 4. 



I am unable to separate this species from Ampelisca compressa 

 Holmes (1905, pp. 480-481) which exists on the basis of a very poor 

 description and figures. 



Ampelisca vera is easily confused with A. romigi, new species, but may 

 be distinguished by the slightly shorter, broad peduncle of uropod 1 and 

 by the non-uncinate rami of the third uropods. 



Considerable variation is seen in the dorsal process of pleon segment 

 4 of the female, the extremes of which can be seen in the figures. Other 

 specimens show intergradations between these extremes. 



Distribution: Along the coast of southern California and in the 

 Channel Islands, 10 to 109 fms; along the coast of Lower California at 

 San Quintin Bay, Todos Santos Island, Cedros Island, and Magdalena 

 Bay, shallow to 41 fms; Gulf of California at San Pedro Nolasco Island, 



