292 Mr. G. T. Bethune-Baker on 



Genitalia : the clasps are of moderate size, broad at the rear, 

 but tapering gradually to the apex and terminating in a rounded 

 extremity ; the " virgae excitatae " are replaced by a peculiar 

 structure, and is for nearly two-thirds of the basal portion a portion 

 of the lower margin of the clasps, then it suddenly develops into a 

 longish narrow rod which extends well beyond the end of the clasp ; 

 the cingulum is narrow, increasing in width as it approaches the 

 tegumen, which is of moderate size, deeply excavated with fairly 

 developed falces ; the aedoeagus is peculiar of moderate size at the 

 rear behind the zone, but for the apical two-thirds it is very narrow 

 indeed, and tapers gradually into a fine point; the tectorius is 

 reduced, thrown right behind the clasps, as in the previous species, 

 having no hood, but being of a different structure, and in a different 

 position from the furca. 



There remain four other descriptions to be considered, 

 Tarucus (Plebeius) fasciatus, Rober, from Banka, Tanicus 

 leopardtfs, Schuhze, from the Philippines, Tarucus clath- 

 ratus, Holland, from Celebes, Tarucus fluvialis, G. -Smith, 

 also from Celebes. These form a small section wherein 

 the spotted pattern is transformed almost entirely into a 

 " banded " pattern, the spots having become confluent 

 so as to form broad definite bands across the wings, thus 

 making them separable at a glance from any others of the 

 genus. 



Tarucus fasciatus, Rober. Plate XVII, fig. 17. 



Plebeius fasciatus, R5ber, Ent. Ver., " Iris," i, p. 194, 

 pi. ix, f. 15 (1887). 

 Rober describes the species (freely translated) as 

 follows : — ■ 



" $. Upperside smoky grey with the median area of all the wings 

 whitish, the basal area being weakly irrorated with light blue ; at 

 the termen of the hind-wings the black border spots of the under- 

 side show through ; hind-wings with a white terminal line, shortly 

 tailed at vein 2 (IVP). Underside yellowish white with blackish 

 grey bands, and terminal rows of spots. 



" Expanse, 27 mm." 



Hab. Banka Island {H. Kuhn). 



There is an excellent photograph of the insect (" Iris," 

 1887, pi. 9, f. 15, p. 194), so sharp and defined in all 

 particulars that there can be no difficulty in identifying the 

 species. I give a reproduction of it on PI. XVII, fig. 17. 



