ON THE OSMYLIN^Î OF JAPAN. 



SIS 



yellow above ; numerous long hairs on both sides. Meso- and meta- 

 thorax blackish ; scutellum and postscutellum somewhat yellowish. 



Legs pale yellow with concolorous hairs, terminal tarsal joint 

 marked with blackish brown ; claws usually strongly serrate internally ; 

 coxa I with a short spur, which is directed distinctly upwards and is 

 dilated at apex. 



Figs. 4—7. 



Osmylus decoratus n. sp. 

 4, Coxa I, 20 x . 5, Male genitalia, 10 x . 6, Female genitalia, 10 x . 

 7, Boat-shaped apparatus of female, 15 x ; 

 a, seen from below ; b, seen from above. 



Abdomen black, with pale yellow hairs ; apex yellowish ; ventral 

 side spotted with yellow. The last segment in the female very short, 

 split below ; boat-shaped organ suspended from the 9th segment by a 

 single sclerite and a somewhat flexible membrane ; bilobed at both 

 anterior and posterior ends ; the posterior end with two palps on tip 

 of the lobes ; marginal area turned downward so as to give the organ 



