26 University of California Publications in Zoology (Vou. 23 
Tribe CARIDES 
Key TO THE CALIFORNIA FAMILIES OF THE CARIDES 
I. Exopodites on all legs; first two pairs chelate; second wrists undivided. 
A. Exopodites of second mavxillipeds rudimentary or wanting. Rostrum 
short or wanting, often represented by a postfrontal tooth or spine. 
Pasiphaeidae, p. 27. 
B. Exopodites of second maxillipeds large. Rostrum moderately or well 
developed. 
Oplophoridae, p. 32. 
II. No exopodites on legs. 
A. One or both legs of first pair simple; legs of second pair unequal, second 
wrists subdivided (multiarticulate). 
1. Only one leg of first pair simple, the other chelate. Rostrum not 
toothed except at apex, which is obscurely bifid. (Not known 
north of San Diego.) 
Lysmatidae, p. 80. 
2. Both legs of first pair simple; first two pairs slender. Rostrum large 
and toothed. 
Pandalidae, p. 40. 
B. Both legs of first pair chelate or subchelate. 
1. First pair of legs subchelate; second wrists undivided. Rostrum 
small, or wanting; occasionally a somewhat elongate suberect 
spine. 
Cragonidae, p. 81. 
2. First pair of legs chelate; second wrists either subdivided or undi- 
vided. 
a. Second wrists undivided. 
i. First antennae with two flagella, one usually cleft a little dis- 
tance from the tip. (Not known north of Santa Cruz 
Island.) 
Pontoniidae, p. 37. 
ii. First antennae with three flagella, owing to cleavage of one 
almost, or quite to the base. (Not known north of San 
Pedro.) 
Palaemonidae, p. 34. 
b. Second wrists subdivided (multiarticulate). 
i. Eyes covered by carapace. First legs much stronger than the 
rest; second wrists divided into five segments. Rostrum 
small or wanting. 
Crangonidae, p. 73. 
ii. Eyes not covered by carapace, free. First legs not much 
stronger than the rest; second wrists divided into three, 
seven, or many segments. Rostrum generally prominent. 
a. Second pair of legs equal or subequal; wrists divided into 
three, seven, or about thirty-two segments. Rostrum 
toothed; rarely reduced in size. 
Hippolytidae, p. 47. 
