144 



PHILORTHRAGORISCÜS SERRATUS. 



strong hook. In connection with this armature the chitinous 

 covering of tbe joint is greatly developed, for the hook 

 arises from a chitinous ridge that occupies the half of its 

 ventral margin and is supported by another ridge, extend- 

 ing across the joint from beneath to above, where it is 

 articulated with a chitinous thickening of the basal joint ; 

 also the muscles are much stronger than it is ordinarily the 

 case. I do not know off an analogous modification of the 

 third pair of feet in any other of the Caligina; though in 

 some species a spine of the basal joint becomes stouter, 

 hook-like curved, as in Gloiopotes hygomianus , Caligus 

 halistae and isonyx ^ yet the ordinary shape of the feet is 

 not modified. 



Considering the different characters, discussed in the 

 present paper, I believe, that our species is not referable 

 to the genus Dinematura and therefore I propose the new 

 generic name Philorthragoriscus. 



Leyden Museum, June 1897. 



EXPLANATION OF PLATE 7. 



Fig. 1. Anterior antenna of female 



Fig. 2. Posterior antenna of female 



Fig. 3. Rostrum of female with palps. 



Fig. 4. Anterior foot-jaw of female 



Fig. 5. Posterior foot-jaw of female 



Fig. 6. Right foot of first pair of female . 



Fig. 7. Right foot of second pair of female. 



Fig. 8. Right foot of third pair of female . 



Fig. 9. Left foot of third pair of male . 



Fig. 10. Right foot of fourth pair of female. 



Fig. 11. Spermatophore 



Fig. 12. Male seen from above 



Notes from the Leyden jyEuseum, Vol. X.IX. 



