419 



that spot. ri'oiKjtuin with two distinct and one indistinct 

 carinac ; shonhh'r keels hirge. 



(J Light orange yellow. Tcgiiiina hyaline, very light yellow over 

 costal and apical cells, opaquely white with waxy secretion, a small brown 

 spot at fork of cubitus and another near cross vein of first median 

 sector; wings hyaline, veins concolorous. opaquely white with waxy 

 secretion. 



Ventral edge of pygophor straight, ventral surface tumid in middle, 

 lateral edges slightly convex; anal segment long, narrow, slightly 

 widened at apex which is bilobed, anus near apex ; genital styles long, 

 ventral edge with an angular projection near base, beyond wiiich edge 

 is slightly sinuous, apex rounded with a subangular projection on the 

 dorso-apical margin, dorsal margin entire, a carina runs down the outer 

 surface near dorsal margin, on the inner surface in middle there is a 

 spine with a curve and somewhat flattened crook at the apex. 



Length 2.6 mm. ; tegmen 3.7 mm. 



1 



Fignre 1. PliacioccpJialiis hi punciata, tegmen. 



Hah. Bartica, British Gniana, Angnst, 1001 {Coll. II. S. 

 Parish). Described from one male specimen. Type in coll. 

 Prof. H. Osborn. 



Genus Sy^'taa[es Fowler. 



Fowler descril)es S. dcllcafus from what he states to be 

 males bnt thev are females. The variety c]iirl(jiirnsis appears 

 to me to be specifically distinct fi'om S. deli cat us. 



When tabulating the genera of Derbidae* I had only a 

 damaged S]^eciinen to examine and I placed the genus in 

 Grou]) I. In the two following species one has the clavus nar- 

 rowly open and the other has it closed, otherwise they are 

 congeneric with S. delicaius. 



S. nigrolineatus sp. nov. 



9 Clavus closed, claval veins joining the suture a little before the 

 apex. Shoulder keels large ; no subantennal process ; medio-frontal carina 

 somewhat obscured towards the apex. 



*H. S. P. A. Ent. Bull., Xn, 1913. 



