ON THE HEML.ROBI IN'AE OE JAPAN. 



23 



Genus Hemerohius Linné. 



Hemerobiw Linné, Syst. Nat., x, p. 549 (1758) ; Walker, Cat. Neuropt. Brit. Mus., ii, p. 

 276 (1853); Hagen, Syn. Neuropt. N. Amer., p. 200 (1862); Needham, N. V. Mus. 

 Bull. 47, p. 551 (igoi); Banks, Trans. Amer. Ent., Soc, xxxii, p. 17 (1905); Need- 

 ham, N. V. Mus. Bull. 86, p. 17 (1905); Banks, Trans. Amer. Ent. Soc, xxxix, p. 217 

 (I9I3»- 



Mitcrcpaifus Rambur, Hist. Neuropt., p. 420 (1842). 



Antcnnre of usual structure. Forewing moderately broad ; costal area 

 broad at base, with humeral crossvein recurrent and branched on the outer 

 side ; costal crossveins branched ; two series of gradate veinlets in both 

 wings ; usually three, rarely four, radial sectors. Hindwing with median 

 fork farther out than the fork of ist radial sector ; upper division of median 

 fork more or less confluent with base of radial sector. 



Type : — H. Immilli L. 



There are seven species of the genus occurring in Japan, of which five 

 seem to be new to science and one to be new to that country. 



Synopsis of the Species : 



1. Antenna; blackish or fuscous black 2. 



Antenna; yellowish or pale yellow 3. 



2. Forewing tinged with brownish yellow, excep- 

 ting a hyaline transverse space in discal area...//, nitidulus F. 



Forewing not tinged with brownish yellow, 



but spotted with fuscous black H. nigrieornis n. sp. 



3. Forewing with many wavy fuscous lines 



runing across it H. Shibakaivœ n. sp. 



Forewing without such marking 4. 



4. Forewing with a distinct piceous streak formed 

 of many spots at the posterior border of discal 



area • H. stria talis n. sp. 



Forewing without such marking 5. 



5. Costal area of forewing very broad at base irregularis n. sp. 



