1919] Chalcid-fly Parasitic on Ant 15 



median furrow or depression ; separated from the post scutellum 

 by a shallow groove, the two together acutely convex at apex, 

 but without teeth or projections. Propodeum flattened and 

 elevated medially, the sides of the central part convexly elevated 

 at the sides, lateral to this with a deep groove extending to the 

 hind coxa separating the lateral part which is acutely convex 

 above near the root of the hind wing. Pleuras sculptured like 

 the mesonotum. Petiole of abdomen as long as the slope of 

 the propodeum; second segment twice as long as the third and 

 fourth together; following very short, not visible from above; 

 apical margins of the second and third segments deeply excised 

 medially. Tarsal claws simple. "Submarginal vein thickened 

 on its apical third; marginal half as long as the submarginal 

 and fully four times as long as the short, stout, nearly per- 

 pendicular stigmal vein ; postmarginal extending about half-way 

 to tip of wing, but gradually evanescent at tip. 



Type from Hornsby, New South Wales, in the writer's 

 collection, bred from cocoon of Myrmecia gulosa by Dr. R. J. 

 Tillyard. 



Male. A pupa (Plate II, Fig. 2) shows twelve distinctly 

 separate antennal joints and is, I suspect a male, and the apical 

 joints are longer, more slender and of approximately equal 

 length. In the female, if the lengthened and constricted 11th 

 joint were regarded as two joints, the apical one would be much 

 shorter than the penultimate. 



Planidium, or First Larval Stage. 



There are no specimens of this instar, but the cast skin 

 of one was found still attached to the mature larva described 

 below. This exuvium was firmly attached to the under surface 

 of the thorax just behind the head and I have been able to 

 remove it almost intact. When mounted in balsam it gives 

 some idea of the structure of the planidium which proves to be 

 very similar to that of Perilampus as described by Smith.* 



Compared with Smith's figure (1912, p. 46, fig. 26 d), of 

 the engorged planidium it appears to have eleven sclerites 

 behind the head, while Perilampus has twelve. The apical 

 plates are very small, however, and quite likely the number 

 is the same in both genera. The head is separated from the 



* Bull. U. S. Dept. Agric, Bur. Ent., Tech. Ser. No. 19, pt. IV, pp. 33-69 

 (1912) and Psyche, Vol. 24, pp. 63-68. (1917). 



