MARINE AMPHIPODA IN MICRONESIA — BARNARD 517 



younger stages having distinct oblique palms (see Schellenberg 1939). 

 Another problem is whether the shapes of the first two coxae always 

 have been determined properly, for some species have coxae with 

 slight posterior lobes or processes and others do not. These would be 

 useful characters if they can be verified in each species. 



The following key to Hyale is simply a survey of the literature and 

 suffers the defects of such compilation without access to materials 

 of each species. Following it are notes concerning additional changes 

 since J. L. Barnard's Index (1958). 



Key to Male Hyale 



1. Eyes absent, ramus of uropod 3 short, antennae subequal, pereopod 5 very 



elongated 2 



Eyes present, other characters not in this combination 3 



2. Gnathopod 2 of female like that of male, large and well developed. 



H. jeanelli 

 Gnathopod 2 of female, with short and distally broadened sixth article. 



H. incerta 



3. Body dorsally carinate H. carinata 



Body not dorsally carinate 4 



4. Antenna 2 longer than body H. campbellica 



Antenna 2 shorter than body 5 



5. Finger of gnathopod 1 strongly furcate H. diplodactyla 



Finger of gnathopod 1 not furcate 6 



6. Article 6 of gnathopod 1 with anterior hump H. galateae 



Article 6 of gnathopod 1 smooth on anterior margin 7 



7. Dactylus of pereopods 1-5 with very large accessory seta near inner base . 8 

 Dactylus of pereopods 1-5 with medium-sized to small seta near middle or 



absent 10 



8. Palm of gnathopod 2 distinct from hindmargin of article 6 9 



Palm of gnathopod 2 not distinct from hindmargin of article 6. 



H. ramalhoi 



9. Coxa 1 bearing a hindlobe H. spinidactyla 



Coxa 1 lacking a hindlobe H. spinidactyloides 



10. Article 6 of pereopods 1-5 with a long stout striated distal spine on inner 



margin, the spine larger than neighboring spines 11 



Article 6 of pereopods 1-5 with short or slender, usually unstriated distal 

 spine on inner margin, not larger than other spines 21 



11. Palm of gnathopod 1 transverse 12 



Palm of gnathopod 1 oblique 13 



12. Hindmargin of article 6 on gnathopod 2 longer than palm . . . H. pontica 

 Hindmargin of article 6 on gnathopod 2 scarcely existent, palm nearly 



contiguous with it H. maroubrae 



13. Article 6 of gnathopod 2 with large hindtooth H. dentifera 



Article 6 of gnathopod 2 lacking large hindtooth 14 



14 Palm of gnathopod 2 distinct from hindmargin of article 6 15 



Palm of gnathopod 2 continuous with hindmargin of article 6 19 



15. Palm of gnathopod 1 broadly expanded, defined by a large bump. 



H. afBnis 

 Palm of gnathopod 1 scarcely expanded, not defined by a large bump , . 16 



