BY G. F. HILL. 461 



Hftid wide (1-65), as wide as prescutum, eyes finely facetted, 

 nearly parallel on inner margins, with scattered, fine, wliitish 

 hairs; elypeus glossy black, convex, depressed in the median line, 

 with a few short, silvery and black hairs, bordered laterally by a 

 narrow fringe of silvery pubescence; gense greatly reduced, 

 clothed with blackish hairs; antenna? inserted above the middle 

 of the head in profile, pale rusty, covered with short hairs, first 

 joint short (048), as wide as long-, second joint about as long 

 as first, widest at apex, apices of first and second joints fringed 

 with short, stiff hairs, third joint long (304), widest in the middle, 

 with five fairly distinct annulations, arista long ( (50) arising 

 from a raised tubercle, densely clothed with short white hairs; 

 frons wide ("45), glossy black, a few hair-like whitish scales near 

 ihe depressed median line; ocellar plate prominent, occupying 

 more than half the width of the vertex, black, rugose, with a few 

 black hairs; vertex as wide as frons, with a few black hairs. 

 ( Figs. la and lb.) 



Text-fig. la, lb. 

 Wallacfia darwini, n.sp., female. 



Thorax widest at insertion of wings (1 85) ; humeral calli pro- 

 minent, on either side of the seutellum there is a prominent disc- 

 like process (prealar callus) projecting (-15) horizontally from 

 the thorax; seutellum large, (-75 long), triangular, armed with 

 two long (-30), stout, apical spines (generic character), and about 

 seven somewhat irregular and smaller stout spines on either side, 

 a patch of silvery scales near apex. The whole upper surface of 

 thorax and the pleura clothed with moderately short, stout, black 



