27b MB. H. E. TURNER OX THE [Feb. 1 5, 



abscissa of the radius longer than the third ; second recurrent 

 nervure received near the base of the third cubital cell. 



Black ; the mandibles, the apex of the clypeus, two minute 

 spots between the antenna?, the posterior margin of the pronotum, 

 the anterior angles of the pronotum, the tegula?, and the post- 

 scutellum pale yellow. Tibiae ferruginous brown. Wings hyaline, 

 nervures black, the stigma ferruginous. 



Length 9 mm. 



5 . Head flattened, small, as long as the breadth anteriorly, 

 narrowed posteriorly, coarsely punctured on the front, very 

 sparsely on the vertex, without a frontal sulcus. Thorax narrower 

 than the head, punctured ; the pronotum a little broader than 

 long, the sides nearly parallel and raised into marginal carina?, 

 with a longitudinal median carina ; scutellum small, with a 

 median carina. Median segment no longer than the scutellum, 

 sharply broadened from the base and steeply sloped posteriorly, 

 punctured and with sparse long pubescence. First dorsal abdo- 

 minal segment divided into two portions, the basal portion raised 

 and strongly emarginate posteriorly, sparsely punctured, the 

 apical portion depressed and smooth ; second segment with four 

 transverse carina?, including the raised apical margin, the two 

 basal carina? rather broadly separated from those at the apex ; 

 segments 3-5 rather coarsely punctured near the apex, the base 

 finely aciculate, the apical margin narrowly depressed and smooth. 

 Pygidium deflexed and broadened from the base ; the dorsal 

 plate rather narrowly ovate, with a low median carina and raised 

 margins ; the ventral plate projecting beyond the dorsal both on 

 the sides and at the apex, rounded, with a narrow emargination 

 at the apex. Fifth ventral segment finely punctured. 



Black : the mandibles, antenna?, legs, and pygidium fuscous, 

 the apex of the first dorsal abdominal segment, the space between 

 the carina? on the second and the extreme apical margin of the 

 third whitish, in some specimens darker. 



Length 5-7 mm. 

 . Hah. South Perth, W. A. (//. M. Giles). .5 S , 5 $ . January. 



" On Leptospermmn bloom." 



Nearest to truncattis Sm. 



Epactiotiiynnus cygnorum Turn. 



Thynnus (aEolothynnus) cygnorum Turn. Proc. Linn. Soc. 

 N.S.W. xxxiii. p. 141 (1908),' J. 



(5 . Varies in size from 10 to 14 mm. 



5 . Head slightly convex, broader than long, strongly rounded 

 at the posterior angles, flattened on the vertex, sparsely punctured, 

 the vertex and the front in the middle almost smooth, a longi- 

 tudinal sulcus on the front ; a small patch of white pubescence on 

 each side about halfway between the eye and the posterior 

 margin of the head. Pronotum neaily twice as broad anteriorly 

 as long, narrowed a little posteriorly, closely punctured, margined 

 anteriorly and laterally with long grey haiis, without a carina or 



