BY R. J. TILLYARD. 763 



and one-third of the length of the wing from the apex, where So, 

 R, and Rs become joined by strong cross- veins, forming the 

 anastomosis; from this point onwards, these three veins continue 

 only as weak branching veins, indistinguishable from those 

 around them. Branches of Rs very numerous, closely parallel 

 to one another, their direction almost parallel with that of the 

 dorsal border of the wing. Central area of wing marked off as a 

 disc, bounded anteriorly by Rs, posteriorly by Cu, and distally 

 by a series of gradate cross-veins, the discal series. Other series 

 of gradate cross-veins may also be developed; in particular, an 

 internal series crossing the disc near its middle, and a terminal 

 series, lying between the discal and the termen, and continuing 

 the line of the costal cross- veins; apart from these, there is little 

 or no development of cross-veins upon the wing. M variable, 

 but always with its branches closely parallel, and occupying only 

 a little of the wing-space. Cu either two-branched or simple, 

 with or without a variable amount of anastomosis with M. Anal 

 veins short, three in number, mostly much branched. 



Abdomen short, moderately stout, completely covered by 

 the wings in the position of rest. Ap])e7idages variable, usually 

 either forcipate or valve-like in the males. 



Eggs oval, with rounded ends; laid separately and attached 

 by one side. 



Larva very distinct on account of its large, squarish head, 

 from which the enormous jaws project like a pair of calipers; 

 mandibles without internal teeth; the body somewhat flattened, 

 of moderate width, fairly long, tapering posteriorly to the anal 

 sucker ; the legs short and formed for running backwards. 

 Colouration greyish-brown, with pruinescence. Inhabits crevices 

 in the bark of large forest-trees; fiercely carnivorous. 



Cocoon spherical, or nearly so, resembling a large pearl; 

 spun from the anus, of fine cream-coloured silk, in crevices of the 

 bark. 



Pupa short and stout, of normal Planipennian form. Active 

 at metamorphosis, when it cuts open the cocoon and ascends the 

 tree for some distance before disclosing the imago. 



