CHALCTDOIDEA BRED FROM OLOSSINA MORSITANS. 



387 



beyond which, the edge is nearly straight, then swelHng broadly out subapically ; 

 from the apex of the lobe the lower edge is minutely denticulate, the 

 denticles numbering rather under fifty. 



Abdomen broadly ovate, stout ; from above, a line between the stylets and the 

 petiole is cut by the edge of the first tergite in the ratio 3:2. The visible edge of the 

 sheath of the ovipositor is one-half the dorsal edge of the preceding tergite. Tergite i. 

 is smooth and shining, but minutely punctate on the posterior one-third especially, 

 and more coarsely on the sides ; tergite ii. with the puncturation feeble anteriorly, 

 and more pronounced posteriorly ; from tergite iii. onwards the surface is increasingly 

 rougher, on vi. quite coarse and dull. Tergites i.-iii. are bare (mainly in the centre), 

 but on their pleurae and elsewhere the surface is shortly and closely pubescent. 



Length, 4-5 mm. ; alar expanse, 5|-7J mm. 



Nyas ALAND : Monkey Bay, Lake Nyasa ; 3 $ $ bred from puparia of Glossina 

 morsitans, 31. v. 15, 27.vi.15 and 9.vii.l5 {Br. W. A. Lamhorn). 



Type, a Q. 



Fig. 5. Propodeoii of Stoniatoceras octodentaia, Cam. 



S. exaratum comes close to S. diversicornis, Kirby, (Journ. Linn. Soc. Lond. ZooL, 

 XX., p. 36, 1886) from Kassala, Egyptian Sudan, and Stomatoceras (Centrochalcis) 

 octodentaia, Cameron, (Zeitschr. f. Hym. Dipt., p. 230, 1905) from the Transvaal. 

 The three forms may be separated most easily by the shape and sculpture of the 

 propodeon. The colour differences (which are probably not very reliable) are as 

 follows : — In octodentaia the funicle is more extensively castaneous, only the last two 

 joints and first divisions of the club dusky, while the tip is again paler. The legs are 

 concolorous fuscous or blackish brown, the hind femora nearly black and the knees 

 hardly paler. Kirby's type now lacks both antennae, but according to the description 

 the " scape of antennae and joints 2, 3, 4 and 11 " are " wholly red," All the femora 

 and tibiae are blackish brown ; the hind femora distinctlv black. Fore and mid 



