62 



ENTOZOA. 



of the male Mermis in insect hosts has not yet been satisfactorily 

 determined. 



Genera. — Gordius, Linneus ; = Ghordodes, Moebius ; Mermis, 

 Dujardia and Siebold ; =AutopleGtus, Balsamo ; = Mermthoidum, 

 Kraemer ; ? Acicula, Renier ; JDracwnculus, Lister ; Sphcerularia, 

 Dufour ; Anguillina, Hammerschmidt. 



Sphcerularia. — In the year 1836, M. Leon Dufour first applied 

 this title to a remarkable Nematode, which he discovered in the 

 abdominal cavities of two species of bee (Bomhus terrestris and B. 

 hortorum). The worm was subsequently found by Von Siebold 

 in two other species of bee (B. muscorum and B. sylvarwm), and it 

 remained for Mr. Lubbock to demonstrate that this parasite not 

 only infested the above-mentioned insects, but also B. lucorum, B. 

 lapidarius, B. pratorum, B. subterraneus, and Apathus vestalis. In 

 a highly instructive memoir which appeared in the " Natural History 



Fig. 15. — Sphterularia bomhi, Dufour ; male and female ; X 15 cliam. — Lubbock. 



Review" for January 1861, Lubbock furnishes us with a full 

 description of the anatomy of the female Sphserularia, and he 

 likewise appears to have discovered the male (Fig. 15). The female 

 is nearly an inch in length, having a tolerably uniform diameter of 

 iV throughout, of a whitish colour, and bluntly pointed at either 



