ON THE OSMYLIN/E OF JAPAN. 5OI 



Genus Spilosmylus Kolbe. 



Spilosmylus Kolbe, Netzflüg. Deutch-Ostafricas, p. 33 (1897) ; 

 Banks, Trans. Amer. Ent. Soc, xxxix, p. 212 and 214 

 (1913); Krüger, Stett. Ent. Zeit., 74 Jg., p. 52 (1913). 



Lysmiis Navâs, Rev. Russ. d'Ent., xi, p. 1 12-13 (191 1). 



Thyridosmyhis Krüger, I.e., p. 87. 



Ripidosmylus Krüger, I.e., p. 61. 



Petersen (I.e.) said that Navâs' Lysmus might be included in the 

 old genus Osmylits, on the ground of the inadequateness of the main 

 character upon which the former was founded ; but I think that there 

 exist certain other important characters, which were not noted by 

 Navâs in his generic diagnosis but which seem to sufficiently warrant 

 the generic separation of the two. On the other hand, I agree with 

 Banks in considering Lysmus to be only a synonym of Spilosmylus. 

 Further, I may say that many of Krüger's genera placed under his 

 subfamily Spilosmylinae are very closely allied to Spilosmylus and 

 can scarcely be distinguished from this. It seems to me that at least 

 two of his genera, Thyridosmylus and Ripidosmylus, should be merged 

 into the present genus, which, in my opinion, may be defined as follows : 



Ocelli present. Basal joint of tarsi much longer than the next 

 following joint. In forewing, basal part of costal area narrow ; costal 

 cross-veins mostly simple ; media forked towards base. In hindwing, 

 a row of cells present beyond end of cubitus ; the cubitus has a branch 



bent posteriorly and not runing parallel to it. 

 Synopsis of the species found in Japan : 



1. A tubercle on hind margin of forewing tuberculatus . 



No tubercle on wing 2. 



2. Antennae fuscous black nigricornis. 



Antennae yellowish 3. 



3. With three black spots placed in a triangle on prothoras 

 flavicornis. 



