150 U.S. NATIONAL MUSEUM BULLETIN 271 



Pleonite 6 visible dorsally, article 3 of antenna 1 longer than article I, acces- 

 sory flagellum well developed Paradryope 



14. Gnathopod 1 with article 6 equal to or greater in length and breadth than 



article 5 (fig. 63j) 15 



Gnathopod 1 with article 6 shorter and/or narrower than article 5 (fig. 

 630 19 



15. Uropod 3 uniramous, accessory flagellum absent Paraoroides 



Uropod 3 biramous, accessory flagellum present 16 



16. Article 3 of antenna 1 subequal to article 1, gnathopods 1-2 equal in size and 



morphology, subchelate Aorcho 



Article 3 of antenna 1 shorter than article 1, gnathopod 1 larger than gnatho- 

 pod 2 or gnathopod 2 extremely setose, occasionally gnathopod 2 simple . 1 7 



17. Gnathopod 2 subchelate Lembos 



Gnathopod 2 simple (fig. 106Z) 18 



18. Coxae 1 and 2 short, wider than long, subequal in size, subquadrate, coxa 2 



not concealing coxa 1, article 5 of gnathopod 2 very bulbous (fig. 64d). 



Xenocheira 



Coxa 1 smaller than and partially to fully hidden by coxa 2, latter longer than 



wide, article 5 of gnathopod 2 not bulbous Leptocheirus 



19. Gnathopods fully subchelate Lemboides 



Gnathopods scarcely subchelate (figs. 63Z, 64/) Rudilemboides 



Genera of Aoridae 



Acuminodeutopus J. L. Barnard 



Acuminodeutopus J. L. Barnard, 1959a. 



Type-species: A. heteruropus J. L. Barnard, 1959a (original 

 designation) . 



Article 3 of antenna 1 shorter than article 1, accessory flagellum 

 present; male gnathopod 1 with large distal tooth on article 5, article 

 6 shorter and narrower than article 5, simple, female gnathopod 1 sub- 

 chelate; male gnathopod 2 nearly simple, poorly setose, article 5 

 longest; outer ramus of uropod 3 longer than peduncle, inner ramus less 

 than half as long as outer. Species: 1, California, littoral. 



Amphideutopus J. L. Barnard 



Amphideutopus J. L. Barnard, 1959a. 



Type-species: A. oculatus J. L. Barnard, 1959a (original 

 designation). 



[Antenna 1 unknown]; male gnathopod 1 with distal tooth on article 

 5, article 6 shorter and narrower than 5, simple, female gnathopod 1 

 subchelate; male gnathopod 2 with moderately setose anterior edge 

 on article 5, article 6 slightly the longest, subchelate; male gnathopod 2 

 as stout as gnathopod 1; head elongate, antenna 2 attached halfway hack 

 on ventral cephalic margin; female gnathopod 2 weakly setose anteriorly 

 iCoremapus) ; rami of uropod 3 equal, longer than peduncle. Species: 

 1, California, littoral. 



