156 
K. OGUMA. 
direction. This aberrant specimen was collected . at Nayoro (Hokkaido) by 
Mr. Ivomura. 
y. pruinosa Selys. 
Wings hyaline, slightly tinged with yellow in the half way to nodus, 
tlie distal part from it of chestnut color, being paler towards the tips, at 
the costa and center of cells. Nervures dark brown, these in the dark 
colored region paler. 
Of these three forms the last, as far as I am aware, is confined in 
distribution to Kiushiu, while the other two are very common in any part 
of Japan proper. 
Female. Just like the «-form of male, only the body somewhat bronzy 
colored, pterostigma white. No distinct forms are represented corresponding 
to the three forms of male. 
Nom. Jap. Yancigi-tombo («-form). 
Kawa-tombo (/3-form). 
Chairo-kaicct-tombo (/-form). 
Loc. Hokkaido, Honshiu, Shikoku, Kiushiu. 
9. Mnais tenuis Oguma. sp. now 
(Textfig. 1.) 
Length of the abdomen ^ 45-46mm. ^ 40 42mm. 
Length of the hind wing o' 35-38mm. ^ 36-37mm. 
Length of the pterostigma ft L2-1.5mm. ij 5 1mm. 
Male. Body : metallic green, densely powdered with white on the vertex, 
frontal part of the thorax including scapulae, basal parts of legs and the first 
three segments as well as the last four segments of abdomen. 15 
Thorax : The part below the second stigma and the whole metepimeron 
entirely pale straw yellow. Wings bright brownish saffron, only paler to- 
wards the quadrangle, nervures deeper in color, but the costa blackish,; 
1) In this point, this species resembles to Mnais imdersoni Mcr.Acm.AX. 
