CANTHOCAMPTUS. 55 



occurs also in a brackish-water gathering taken by the 

 Rev. A. M. Norman at Isle Oronsay, Skye. 



It may be readily distinguished at sight from 

 Tachidius by its somewhat greater size, and more 

 slender and graceful figure, as well as by the longer 

 antennae. 



4. CANTHOCAMPTUS TRISPINOSUS, nov. sp. PI. XLY, 

 figs. 1522. 



Anterior antenna 9-jointed (fig. 15), slender, the 

 last joint very small, third and sixth long, fifth short, 

 bearing numerous rather short hairs ; inner branch of 

 the posterior antenna small, 1 -jointed. Mandible-palp 

 minute. Lower foot-jaw moderately strong (fig. 19), 

 second joint having two slender spines on the external 

 margin. First pair of feet exactly like those of Can- 

 thocamptus minutus. Inner branches of the second, 

 third, and fourth pairs short, 2-jointed (fig. 20), the 

 first joint very small, the second elongated. Basal 

 joint of the fifth foot of the female (fig. 21) not at all 

 produced downwards, bearing three strong plumose 

 setae and a fringe of several minute cilia on the inner 

 margin ; second joint long and narrow, internal margin 

 densely fringed with small hairs, external corrugated 

 and bearded ; one long and two shorter apical setae, 

 and two on the external margin, all of which are 

 strongly ciliated. The segments of the abdomen, 

 except the last, are finely denticulated along the post- 

 erior margins (fig. 22) ; anal operculum smooth ; 



