ON THE 1 IEMEROBI INAE OF JAPAN. 



31 



Hemer obi us S/iibakaivœ n. sp. 



Head pale yellow, a blackish stripe from each eye to mouth ; brownish 

 behind eye ; antennae yellowish somewhat brownish toward apex. 



Prothorax pale yellow, slightly brown on each side ; anterior portion 

 of the brown space strongly suffused with darkish. Meso- and metathorax 

 nearly uniformly yellowish. Legs pale yellow. 



Wings hyaline, venation pale yellow. Forewing rather distinctly 

 marked with numerous wavy brownish lines running across the wing ; 

 median not bent toward cubitus at connecting veinlet ; three radial 

 sectors, the third forked three or four times before outer gradate series ; 

 upper branch of the third sector lorked betöre inner gradate series, lower 

 branch simple. 



Hindwing without marking, except in pterostigrnatic region which is 

 light yellow. 



Abdomen yellowish. In the male, 9th dorsal segment produced 

 triangularly at hind margin ; genital appendage not forked, the apex 

 furnished with a short stout process. 

 Measurements : 



Length of body 6 mm. 



Length of forewing 7 mm. 



Width of forewing 3 mm. 



Length of hindwing 6 mm. 



A pair (-£• captured by Mr. M. Shibakawa at Akakura, Prov. 

 Echigo, on July 30, '14, and a female specimen captured by Mr. A. Nohira 

 at the same locality on August 7, '14, are in my collection. 



Remark : Besides the three specimens just referred to, there is further 

 a female specimen captured by the author at Nikko, July 18, '14, which 

 closely resembles this species, but differs from it in having the wing- 

 markings much restricted and the basal two abdominal segments deeply 

 variegated with black on dorsal side. I think the specimen should be 

 looked upon merely as a variational form of the species, so at least until 

 contradictory evidences can be produced. 



