BY E. PETERSEN. 639 



CUSS at present ; but probably the number of spots on the wing- 

 disc is liable to variation, which, perhaps, may be due to 

 sexual differences. 



Oligochrysa, gen. nov. 



One series of crossveins in the disc — the space between the 

 radial sector and the media — parallel to media in the basal 

 half of the wing, and then bent upwards, forming an S-shaped 

 row, which joins the radial sector. In the disc of the forewing, 

 two rows of cellules before the series of gradate crossveins, one 

 row behind. 



Type: 0. gi^acilis, sp nov. 



The genus is similar to Apochri/sa; only the arrangement of 

 the gradate veins in the wing-disc differs. In Apochrysa there 

 are at least two series of gradate veins — the crossveins some- 

 times arranged somewhat irregularly — ; in Oligochrysa only 

 one series, ending in the radial sector, one-third of the length 

 of the wing from tip. 



Oligochrysa gracilis, sp.nov. (PI. Ixxiii., fig. 4). 

 Head reddish-yellow; palpi whitish. Antennae longer than 

 the forewing, brownish-yellow ; the two basal joints with a 

 purplish-red stripe exteriorly in immature specimens ; in the 

 mature specimen, all the basal joints are purplish-red exteriorly. 

 First joint very stout ; second joint smaller, globular. Pro- 

 thorax a little longer than broad, front angles rounded; lateral 

 margins with a reddish stripe. Thorax and abdomen pale 

 reddish-brown ; metathorax with two indistinct reddish spots ; 

 the abdomen with indistinct reddish spots laterally. Legs yel- 

 lowish-white ; claws darker. Wings hyaline ; iridescent. All 

 veins testaceous except the upper end of the crossveins between 

 radius and its sector together with the inner gradate series, 

 which are blackish-brown. In the forewing, two brown dots, a 

 larger oblong one enclosing the posterior crossveins in the inner 

 gradate series, and a smaller one enclosing the last but one of 

 the crossveins between radius and its sector. In the hind- 

 wing, there is only the corresponding spot present, but it is 



