PAENASSIUS— LEPTOCIECUS. 



507 



There i« little doubt that the above descriptions refer to the same insect, 

 i. e. P. cifrinarhis, the only species of the genus so far known to occur in 

 Japan. It is common at moderate elevations at Nikko, Central Japan, and 

 at Hakodate in the Island of Yesso, where it occurs close to the sea-level. I 

 have also received it from the Island of Kiushiu, Japan, and my collectors 

 obtained it in Western China at Pu-tsu-fong, and at Chang-yang in Central 

 China. 



Considerable variation is exhibited. Some specimens from Hakodate have 

 the black discoidal bars and the submarginal band entirely eliminated ; all 

 gradations between this form and typical specimens such as that figured 

 (Plate XXXIII. fig. 6, d ) are represented. A female example from Pu-tsu- 

 fong (Plate XXXIII. fig. 5) is almost entirely melanic. 



Staudiuger (Horn, sur Lep. vi. p. 139) asserts most positively that this 

 species is nothing but a form of P. stuhhcndorfii, Menetries *. If he were to 

 compare good series of both species, he would discover the following points 

 of difference : — P. citrmariiis is uniformly larger, but not so rounded in the 

 wing as P. stuhlendorjii ; the ground-colour is yellower, and there is always 

 a distinct yellow collar : the under surface of the body is also more 

 strongly marked with yellow than in any specimens of stuhhendorjii that 

 I have seen. In the female the pouch (Plate XXXIII. fig. 5) is much 

 shorter and far darker in colour, almost black in fact. 



Some well-marked specimens of P. citrinarius have a superficial resem- 

 blance to faintly-marked P. felderi, Bremer, 



Fixsen (Pom. sur Lep. iii. p. 263) records this species from Corea, under 

 the name of P. stuhhendorfii, and states that it occurs there in July. There 

 is also a specimen from Corea in Mr. Elwes s collection. 



Genus LEPTOCIRCUS. 



Leptocircus, Swainson, Zool. 111. Ins. ii. p. 106 (1833) ; Doubleday, Gen. Diurn. Lep. i. 

 p. 22 (1847). 



" Head large ; forehead broad. 

 " Eyes ovate, prominent. 



* Ins. Lehm. p. 57, pi. vi. fig. 2 (1848). 



M. Grum-Grshimailo Las sent me specimens of P. utahhendorjii which he obtained in Amdo ; 

 these examples differ fi'om Amurland examples in being less marked with black. 



