48 
PACIFIC SCIENCE, Vol. VII, January, 1953 
Megacheles Group 
1. C. hailstonei (Coutiere) var. paucispi- 
nata Banner 
2. C. hrachymerus Banner 
3. C. albatrossae Banner 
4. C. tuthilli Banner 
5. C. oahtiensis Banner 
6. C. collumiana (Stimpson) 
7. C. deuteroptis (Hilgendorf) 
8. C. paradentipes (Coutiere) 
Macrochirus Group 
9. C. gracilis (Heller) var. simplex Banner 
10. C. edmondsoni Banner 
11. C. latipes Banner 
12. C. ventrosa (Milne-Edwards) 
13. C. amir ante i (Coutiere) 
14. C. nanus Banner 
15. C. hawaiiensis 
16. C. paragracilis (Coutiere) 
Crinita Group, Obesomanus Subgroup: 
Not represented. 
Crinita Group, Crinita Subgroup 
17. C. paralcyone (Coutiere) 
18. C. brevipes (Stimpson) 
19. C. clypeata (Coutiere) 
Crinita Group, Diadema Subgroup* 
20. C. paracrinita (Miers) 
21. C. paracrinita (Miers) var. bengalensis 
(Coutiere) 
22. C. gracilipes (Stimpson) 
23. C. pugnax (Ddidd) 
24. C. diadema (Dana) 
25. C. pseudopugnax Banner 
26. C. percyi (Coutiere) 
Brevirostris Group 
27. C. rapax (Eabr.) 
28. C. platyunguiculata Banner 
* This name has been changed from Insignis to 
reflect the placement of C. insignis (Heller, 1861) as a 
synonym to C. diadema (Dana, 1852); although the 
rules of zoological nomenclature do not apply to this 
subgeneric category, it was thought that the change 
would reduce confusion. 
t Two species of this group, C. audonini (Coutiere) 
and C. strenua , which have been reported from 
the Hawaiian Islands, are not included in this list nor 
in the key because the records are doubtful (see pp. I4l 
and 142). 
Edwardsi Group! 
29 . C. leptochirus (Coutiere) 
30. C crassimanus (Heller) 
31. C. pacifica (Dd-ndi) 
With the change of the generic name from 
Alpheus, a masculine noun, to Crangon (from 
Gr. Kpayyov) a feminine noun, it has been 
necessary to change the endings of some of 
the specific names. 
It was hoped that in the key to the species 
it would be possible to avoid the use of all 
sexually dimorphic characteristics and the 
large and small chelae which are so often lost. 
However, it was soon found that such a key 
would be difficult to use and would throw the 
species out of their normal sequence. Wher- 
ever possible the substitution of other char- 
acteristics for these was made, especially for 
sexually dimorphic characteristics. Einally, ac- 
cessory characters are given where it was 
thought that they would be useful. 
HAWAIIAN SPECIES OF CRANGON 
1. Anterior margins of orbital hoods 
with acute teeth 2 
Anterior margins of orbital hoods 
rounded, flattened, or keeled but 
never bearing acute teeth 13 
2(1). Outer face of large chela with sev- 
eral longitudinal grooves and 
crests; dactylar articulation of 
chela flanked with strong teeth . 3 
Large chela rounded, no grooves, 
crests, or teeth 10 
3(2). Inferior distal margin of merus of 
third leg rounded. (Some aber- 
rant specimens of some species 
in this group lack acute teeth 
on the orbital hoods; they can be 
recognized easily, however, by 
the twisted and crested nature of 
the large chela.) 4 
Inferior distal margin of the merus 
of the third leg produced into an 
acute or obtuse tooth 8 
4(3). Crest leading to the palmar adhe- 
sive plaque on large chela sharp; 
