KUWAVAMA : STUDIES ON 'HIE DILARIDAE OF JAPAN. J-] 



Under the external structure, a little supplement to the \v(irks of IIaGEN 

 (j), Navas (/o, //) &c. has been made by the author in his studies. As 

 the authors just mentioned stated, the length of each joints of antennae differs 

 according to its position. The ilata of measurements upon the antenna of 

 D. formosauiis ^ are as follows : — 



Positions of joints 111 \'l IX Xll XV XV'lll XXI 



Icngth/widtli i.oo i .9<S 2.67 2.71 2.21 1.55 0.95 



The author measured also the ratio of each length of tarsal joints. 



(Material : — Fore-leg of D. japonicjis gracilis KwV.M.) 



Of the wings, as COMSTOCK (.?) stated, one of the remarkable features 

 is the number of radial sector and its relation to radius. The author recognized 

 two radial sectors in both wings of D. japonicus, but onlj' one in each wing 

 of D, formosatms. On the former species two sectors of hind wing started 

 from almost one point of the stem. 15ut on the variety of the same species, 

 D. japcmictis gracilis, the unitation is occurred at some short distance from 

 radius and appeared like one sector only. On the case of D. forinosaiius, 

 the imitation of first and second sectors in the forewing may be a very rare 

 case in the same genus. From these points of view, as well as from many 

 other respects, the author agrees with COMSTOCK's discussion ; " although 

 the radius of the fore wings has from one to three sectors, the increase in 

 the number of sectors appears to be due to a splitting back of one or two 

 branches of vein R, rather than to a coalescence of veins Ri and R^, as is 

 the case in the Hemerobiidae." 



On the classification of the family, NavAs (/./) has separated in two 

 tribes and seven genera, but Banks (/) recognized only one genus, Dilar, 

 in his Dilarinae of Hemerobiidae. As KlaP-AlEK (j) stated already, NavAs' 

 definition of the generic characters is complicated and we can not determined 

 the generic position after him on a female specimen. As MacLachlan (7) 



