Mr. R. E. Turner on Fossorial Hymenoptera. 93 



as the third. Serration of the hind tibiae almost obsolete. 

 Radial eell broadly truncate at the apex ; recurrent nervure 

 received close to two-thirds from the base of the cubital 

 ceil. 



Hab. Z un^eru, N. Nigeria (J. W. Scott-Macfie), January- 

 February 1911. 



Rhopalum spinulifer, sp. n. 



d . Xiger ; scapo, pronoto, postscutello, callis humeralibus, pedibus 

 antieis intermediisque, trochanteribus coxisque exceptis, flavis ; 

 segment is abdominalibus duobus basalibus subtus lateribusque, 

 segmentis sexto apice, septimoque, femoribus posticis apice, 

 tibiis posticis supra nigro-maculatis, ruetatarsisque posticis basi 

 ferrugineis ; tegulis brunneis ; alis hyalinis, iridesceutibus, vends 

 nigris ; petiolo apice spina minuta armato. 



Long. 4 mm. 



$ . Eyes separated at the base of the clypeus by a distance 

 about equal to the length of the scape ; antennas short, the 

 basal joints of the flagellum normal, not tuberculate or 

 etnarginate. Head subopaque, very minutely punctured ; 

 posterior ocelli as far from each other as from the eyes. 

 Pronotum transverse, not rounded at the angles; thorax 

 subopaque, minutely and closely punctured. Petiole rather 

 stout, distinctly swolleu at the apex, with a small spine at 

 the apex on the dorsal surface ; the second tergite half as 

 long again as the first, broadened from the base, no longer 

 than the third. Hind tibia? stout, distinctly but not strongly 

 serrate. Radial cell very broadly truncate at the apex ; 

 recurrent nervure received just beyond the middle of the 

 cubital cell. 



Hub. Kuranda, N. Queensland (F. P. Dodd). 



In the form of the petiole and following segments this 

 resembles R. frenchii, Turn. , but differs much in colour and 

 in the remarkable spine on the petiole. 



Rhopalum imbelle, Turn. 



Rho alum tricolor, Sm., subsp. imbelle, Turn. Ann. & Mag. Nat. Hist 

 (8j xv. p. 92 (1915). 



In addition to the distinctions given in the description, 

 the male antennae are much shorter in iwbelle than in 

 tricolor ; the third joint of the flagellum, which is emarginate 

 beneath, being more than twice as long as the apical breadth 

 in tricolor, and scarcely hall' as long again in imbelle. On 



