1186 CRUSTACEA. 



Plate 83, fig. 5 a, female, enlarged ; Z>, extremity of antenna. 

 Fresh-water pools, Vanua Lebu, Viti Islands, July, 1840. 



Length, one-twenty-fourth of an inch. Colour, faint yellowish. 

 The anterior setae of the two subultimate joints of the anterior antennae 

 scarcely exceed in length the diameter of the joints ; while the poste- 

 rior of these and also of the preceding joints are rather longer than 

 the penult joint. The first or inner seta of the caudal stylets equals 

 half the second, and the third is of intermediate length ; the fourth is 

 a little shorter than the stylets. The joints of the abdomen are 

 variable. External ovarian sacs are as long as abdomen or nearly so, 

 and divergent in position ; the eggs were rather large and of a dull 

 bluish colour. 



Subfamily HARPACTICIN^J. 

 Genus CANTHOCAMPTUS, Westwood. 



In the first species of this genus, here described, the legs of the first 

 pair are not smaller than in some Harpactici, and have a similar 

 form. The legs, however, of the second pair have three-jointed 

 branches, the distinguishing characteristic of the Canthocampti as the 

 genus is here adopted. The two following species are placed in this 

 genus because of the form of the body, the abdomen being continuous 

 in outline with the thorax and not abruptly smaller ; our notes and 

 drawings contain no information as to the character of the second 

 pair of legs, and it is possible that farther investigation may require a 

 different arrangement. 



CANTHOCAMPTUS virescens. 



CepJialotJwrax ovatus, antice rotundatus et hreviter rostratus, segrnentis 

 postke non acutis. Abdomen paululum subito angustius et posticd 

 sensim deerescens, h-articidatum. Antennas anticcB breves, dimidii 

 cephalothoraois longitudine, 9-articulatce ; articulis basdlibus quattior, 

 crassiusculis, secundo niaximo, setis perbrevibus. Pedes antici parvi, 

 digito dimidii articidi secundi longitudine. JStyli caudcdes brevissimiy 



