92 ^Ir. R. E. Turnor on Fossorial Hymenoptera. 



base, the triangular area divided by a longitudinal sulcus. 

 First abdominal segment about equal in length to the 

 second^ the a])ical half rather strongly swollen ; pygidial area 

 smooth and shining at the apex. Recurrent nervure received 

 just before tMo-thirds from the base of the cubital cell, at a 

 distance from the apex almost equal to twice the length of 

 the trausverse cubital nervure. Hind tibiae swollen and 

 spiuose. 



Hab. Yallingup, S.W. Australia ; November. 



This is near R. frenchii, but the petiole is longer and the 

 colour of the legs different. It is also a much larger species. 



Rhopalum tricolor, Sm. 



CraWo tricolor, Sm. Cat. Ilyni. B.M. iv. p. 394 (1850). d- 



Crahro [lihupalum) militaris, Turn. Proc. Zool. Soc. Loudou, p. 523 



U908). cf. 

 Crahro (^Rliopalum) tricolor, Turu. Proc. Zool. Soc. London, p. 524 



(1908). $c?. 



Smith's type is lost, but from a long series of Tasmanian 

 specimens 1 have no doubt there is only one species^ and that 

 inilitaris, Turn., is quite a usual form of the species, the 

 form identified by me as tricolor being a dark colour-variety 

 found in the mountain-districts of New South Wales and 

 Victoria. 



Hab. Eaglehawk Neck ; February. Mt. Wellington, 

 2200 ft. ; January. 



Also from S.E. Australia. A closely allied form is common 

 in S.W. Australia, but ditlers in the slightly shorter petiole, 

 in the almost obsolete spines of the hind tibiae, and in the 

 slightly nearer approach to each other of the posterior ocelli. 

 For this form I propose the name Rhopalum tricolor imbelle, 

 subsp. n. 



R. tricolor "was taken freely on Leptospermum^ also 

 burrowing in sandy banks. 



Crabro (subgenus Solenius). 



I use the name Solenius in a wider sense than Ashmead. 

 The Australian species of Crabro do not fall well into 

 Ashmead's genera, which were founded without the study of 

 any large exotic collection. The species included here in 

 Solenius fall into more than one group of species, but in all 

 the female has the mandibles tridentate, a supraorbital fovea, 

 and a carina on the mesopleurai before tlie intermediate 

 coxse. C. triclentatus and tasmanicus have the clypeus very 



