1 6 RHOPALOCERA N I MONICA. 



This Thecla resembles in the coloration of its sexes a widely different member of the Lycaenidae, 

 Lycxna argiolus. The male is a plain blue, the female is blue with a heavy border of black. The latter is 

 excellently figured in the "Aid," Part 13, p. 107. This resemblance of coloration is very remarkable, 

 and is an example of the recurrence of similarity in the ornamentation of the sexes in two widely sepa- 

 rated species of the same group of insects. 



45- Thecla ibara, But. (PL 4, fig. 18.) 



Locality Nikko. 



I have a single specimen from Nikko. This species is excellently figured in the "Aid," Part 14, 

 pi. 113. 



46. Thecla butleri, Pent. (PL 4, fig. 13-) 



Locality Yezo. 

 This is also a rare species, and I have only a single example from Yezo. 



47- Thecla signata, But. (PL 4, fig. 19.) 



Locality Yezo. 



This species is not uncommon in Yezo. I have several specimens; they all vary considerably in the 

 markings on the under side. 



48- Thecla frivaldszkyi, Led. (PL 4, fig. 20.) 



Locality Yokohama. 



Time of appearance March. 



'1 his is one of the earliest butterflies to appear. It is far from an uncommon species, but owing to its 

 habits is very likely to be unnoticed by the collector. It has a very rapid flight, and always perches on a 

 high spray, generally having a favourite leaf from which it makes excursions, chasing any passing object 



until tired, and then returning to its original perch. Only one brood appears during the year, and this 

 very often when the snow is on the ground. 



49- Polyommatus phlseas, Linn, (PL 4, fig. 21.) 



P. cliiiiensis, Feld. 

 P. elens, Fab. 



Locality Yokohama. 



Time of appearance March to November. 



Food plant Rumex acelosa, Linn. . 



This species varies greatly in size and coloration according to the time of year that it emerges in the 



