Mr. B. E. Turner on Fossorial Hymenoptera. 289 



cubital cell than in natalensis. Cubitus of the hind wing 

 originating before the transverse median nervure. 



Hab. Nyasaland, S.W. of Lake Chilwa; January 16, 

 1914 (S. A. Neave). 



This belongs to the group of natalensis, Sm. ; and effugiens, 

 Brauns, but differs much in colour. The mesonotum is 

 marked in front by four shallow grooves instead of low 

 carinas as in the two species referred to. 



Arpactus fugax, sp. n. 



5 . Brunneo-ferruginea ; fronte, vertice, mesonoto fascia longitudi- 

 nali, scutello basi,postscutello basi, segment o mediano area basali, 

 mesosternoque nigris ; pronoto, scutello pcstscutelloque fascia 

 apicali, segmento dorsali secundo fascia lata apicali, quarto fascia 

 apicali, quintoque omnino flavis ; alia hyalinis, venis fuscis, stig- 

 mate testaceo, area radiali valde infuscata. 



Long. 13 mm. 



? . Eyes slightly, hut not strongly, converging towards 

 the clypeus ; second and third joints of the flagellum about 

 equal, longer than the scape; front marked with a distinct 

 longitudinal groove. Mesonotum marked anteriorly with 

 four short and distinct grooves ; the transverse, crenulate, 

 groove at the base of the scutellum very strongly marked ; 

 the marginal and median grooves of the minutely punctured 

 and pubescent basal area of the median segment marked 

 with distinct striae. The whole insect very minutely punc- 

 tured and clothed with very fine pubescence, more sparsely 

 punctured on the head. First abdominal segment slender, 

 gradually widened from the base ; pygidial area sinning, 

 with a few scattered punctures, triangular, the sides longer 

 than the base. Second abscissa of the radius as long as the 

 first. 



Hab. Makindu, British East Afiica; December 16, 1911 

 (S. L. Hinde). 



This belongs to the natalensis group, and seems to be very 

 near effugiens, Brauns, but has shallow grooves on the meso- 

 notum, instead of low carinas, no yellow hand on the third 

 dorsal segment, and the eyes can hardly be described as 

 " stark konvergent." In other points the description of 

 effugiens agrees fairly well v:\X\ifngax. 



The African species of the natalensis group (of which 

 Handlirsch gives kohlii as the type) may be separated as 

 follows : — 



1. Second dorsal segment almost entirely yellow, 

 at most with a triangular black mark on the 

 middle of the apical margin A. natalensis, Sin, 



