JAPANESE DRAGONFLIES OF THE FAMILY CALOPTERYGIDAE. 101 
15. Rhynocypha ogasawarensis Matsumura. sp. nov. 
(Textfig. 4) 
Length of the abdomen ^ 20-21. 5mm. ^ 18-19mm. 
Length of the hind wing ^ 24-26mm. ^ 25mm. 
Length of the pterostigma ^ 2.5mm-3mm. ^ 2.4mm. 
Head : glossy black, the anterior side of the basal joint of the antenna, 
a large spot below it and the sides of the labrum straw yellow; on the 
vertex with a pair of oblong yellowish spots between the ocelli and the eyes, 
and another pair of small spots in similar color very close to eyes. 
Male. Thorax : black, with two narrow yellowish streaks at the sides, 
stretching along the first and the third lateral sutures, a small .similarly 
colored spot on the upper part of the mesepisternum and metepimeron. 
Wings narrow and long ; fore wings hyaline, suffused with dark yellow, the 
very apical part scarcely colored ; the hind wings also hyaline ; but being 
somewhat deeper in color, the apical one fifth blackish ; pterostigma brown. 
Abdomen : rather depressed, dorsal surface dark red, while the ventral 
surface and the sutures of segments black. Upper anal appendages slender, 
nearly as long as the 9th segment, curved inwardly, black in color ; the 
lower nearly the half the length of the upper and also black. 
Female. Thorax : similarly colored with the male, but with niore a pair 
of thready red stripes on the front of the mesothorax and a large speck on 
the metepimeron at sides. Wings hyaline, much deeply colored than the 
male, wanting the black part at all. 
Abdomen : not depressed as in the male, the dorsal surface reddish brown, 
