Hawaiian Crangonidae — Banner 
51 
chela strongly compressed ..... 29 
25(24). Merus of third leg without tooth 
on inferior distal margin. All ap- 
pendages long and slender; ros- 
tral base narrow and flattened 
dorsally; merus of large cheliped 
with few movable spines ...... 
............ C gradlipes (p. 115) 
Merus of third leg with strong 
tooth on inferior distal margin . 26 
26(25). Second carpal article of second leg 
twice as long as first. Merus of 
large cheliped with series of 
- spines, subterminal tooth on in- 
ferior internal margin; rostral 
base very narrow; rostrum not 
depressed.. . . . .C. pugnax (p. 116) 
Second carpal article of second leg 
about as long as first 27 
27(26). Rostral base broad, at least 0.7 as 
broad as long. Merus of large 
cheliped without spines; rostrum 
somewhat depressed 
............ C diadema (p. 118) 
Rostral base narrow, less than 0.5 
as broad as long 28 
28(27). Anterior portion of base of ros- 
trum sharply carinate with slop- 
ing margins; margins overhang- 
ing orbital-rostral grooves only 
in posterior 0.3. Large chela with 
depressed areas on superior por- 
tion of inner and outer faces; 
merus of cheliped with few 
spines but numerous serrations. 
C pseudopugnax (p. 122) 
Anterior portion of base of ros- 
trum flattened, with only slight 
Carina; margins of rostral base 
overhanging orbital-rostral 
groove for entire length. Large 
chela without depressed areas as 
in C. pseudopugnax, merus with 
similar serrations . C (p. 124) 
29(24). Second carpal article of second leg 
shorter than first. Propodus of 
third leg bearing only light setae 
C rapax (p. 126) 
Second carpal article of second leg 
over twice as long as first. Pro- 
podus of third leg with numer- 
ous long setae 
.C. platyunguiculata (p. 130) 
30(23). Length of dactylus of third legs 
about twice breadth of merus. 
Large chela with transverse 
groove across top, _ connecting 
triangular depressed area on each 
face; lower margin with strong 
lobe; small chela of male prob- 
ably "balaeniceps-shaped” .... 
C leptochirus (p. 133) 
Length of dactylus of third legs 
about equal to breadth of merus . 31 
31(30). Posterior margin of groove behind 
dactylus of large chela sloping 
back gradually (best seen in pro- 
file), not projecting over floor of 
groove; with more or less con- 
spicuous tooth distally on inferi- 
or internal margin of merus of 
large cheliped; small chela "ba- 
laeniceps-shaped” in male, slen- 
der in female; usually with spine 
on ischium of third legs ...... 
C crassimanus (p. 134) 
Posterior margin of groove behind 
dactylus of large chela overhang- 
ing floor of groove (best seen in 
profile) ; no tooth on inferior in- 
ternal margin of merus of large 
cheliped; small chelae of both 
sexes with slender conical fin- 
gers; usually without ischial 
spine on third legs ........... 
C, pad fica (p. 138) 
Megacheles Group 
Crangon hailstonei (Coutiere) pauci- 
spinata var. nov. 
Fig. 16 a-j 
Alpheus hailstonei Coutiere, Fauna and Geog. 
Maid, and Laccad. 2(4): 879, pL 74, fig. 18, 
1905. 
