Hawaiian Crangonidae — Banner 
15 
DISCUSSION: The description of this genus 
as given by Coutiere (1899: 330) is modified 
to accommodate those species described sub- 
sequently and further to permit the assign- 
ment of a new species of doubtful relation- 
ship, A. hlunguiculatus Banner, thereto. 
The genus is confined largely to the west 
Pacific and the Indian Oceans; aside from A. 
chilensis Coutiere, found off South America in 
the Pacific, the two species listed below are 
the only members of the genus that have been 
recorded as far east as the central Pacific 
Ocean. 
HAWAIIAN SPECIES OF ALPHEOPSIS 
1. Dactyli of third to fifth legs simple. . . 
A. equalis (p. 15) 
Dactyli of third to fifth legs biunguicu- 
late (?) -A. hlunguiculatus (p. 18) 
Alpheopsis equalis Coutiere 
Fig. 4 a-o 
Alpheopsis equalis Coutiere, Paris Mus. d’Hist. 
Nat., Bui. 2(8): 380, 1896. 
Alpheopsis equalis var. truncatus Coutiere, Soc. 
Philomath. Paris, Bui. IX, 5(2): 89, 1903. 
Alpheopsis equalis and Alpheopsis equalis var. 
truncatus Coutiere, Fauna and Geog. Maid, 
and Laccad. 2(4): 868, 1905. [A fuller de- 
scription and discussion, with figures, of 
both forms.] 
Alpheopsis aequalis de Man, Siboga Exped., 
39ai (2): 177, 1911. 
DESCRIPTION: Frontal border of carapace 
produced into acute rostrum extending about 
0.7 length of visible portion of first antennu- 
lar article. Termination of rostrum, in lateral 
view, varying from acute to obliquely trun- 
cate. Frontal border projecting beyond cor- 
neas of eyes, masking them entirely in dorsal 
view and almost or entirely in lateral view; 
marked by 2 pairs of slight convexities, one 
pair dorsad, one pair laterad of eyes. Ptery- 
gostomial angle rounded or produced into 
acute tooth. 
Antennular peduncle short and heavy with 
second article shorter than visible portion of 
either first or third. Stylocerite with tip ex- 
tending almost to end of second article of 
antennular peduncle. 
Scaphocerite short and broad, as long as 
antennular peduncle, slightly shorter than pe- 
duncle of antenna. Lateral spine of scaphoce- 
rite not pronounced and equal in length to 
squamous portion. Lateral spine of basicerite 
acute but not well developed. 
Basal articles of third maxilliped with strong 
spiniform bristles. 
Chelae almost symmetrical in size and 
shape, not showing more than 10 per cent 
difference in size; rounded and without 
grooves. Fingers compressed, with slight, ir- 
regularities on opposing faces; usually with 
stiff recurving hairs. Carpus elongate with 
outstanding flange into which proximal end 
of propodus fits, with slight constriction be- 
fore this flange. Merus with upstanding collar 
on outer distal side into which proximal end 
of carpus fits, with rounded edges, with vari- 
able set of long stiff bristles on inner lateral 
and superior margins. Ischium also with bris- 
tles on superior distal face. 
Carpal articles of second thoracic leg with 
ratio 10 : 6 : 4 : 4 : 5. 
Third legs relatively long and slender, with 
ischium 0.5 as long as merus; merus 6.5 times 
as long as wide; carpus slightly less than 0.5 
as long as merus; propodus slightly longer 
than merus; dactylus about 0.3 length of pro- 
podus. Merus without spines or teeth; carpus 
with long slender spine on distal portion of 
inferior margin; propodus bearing 4 or 5 
spines on inner margin. Appendage glabrous 
except several setae on distal end of merus, 
distal end of propodus, and middle of dac- 
tylus. "Brush” of fifth thoracic legs of 10 
rows of weak bristles. 
Species small, maximum length about 12 
mm.; color in life not noted. 
DISCUSSION: In the collections available 
from Hawaii there are 13 specimens of this 
species, some broken and some entire. These 
specimens vary in a series of points, yet plain- 
ly all are members of the same species for they 
