42 HYMENOPTERA. 



domen lanceolate; the apical segment rounded, punctured at 

 the base, and glassy smooth at the apex. 



Female. Length 2^ lines. Pale ferruginous : the head ob- 

 long-quadrate ; the thorax narrower than the head, the sides of 

 the prothorax slightly rounded, the mesothorax narrow and 

 quadrate above ; the metathorax widened to its apex, which is 

 rounded. Abdomen elongate, as long as the head and thorax, 

 and entirely smooth and shining ; the apex acute. 



Hab. S. Australia (Lower Plenty). (Coll. R. Bakewell, Esq.) 



114. THYNNUS ATTENUATUS. B.M. 



Female. Length 4i lines. Head black, compressed, smooth, 

 subopake, rounded behind, anteriorly truncate ; the face, man- 

 dibles, antennae, legs, and thorax anteriorly, rufo-testaceous ; the 

 thorax compressed, very narrow anteriorly ; the metathorax nar- 

 rowed at the base; abdomen obscure rufo-testaceous, with a 

 tuft of pale pubescence at the base ; the second segment trans- 

 versely striated. 



Hab. Australia. 



115. THYNNUS FIMBRIATUS. B.M. 



Female. Length 4 lines. Head and abdomen black ; thorax 

 and legs ferruginous, the prothorax prolonged into a neck ; 

 thorax strongly punctured; the first and second segments of 

 the abdomen transversely striated, the three following punc- 

 tured at their apical margins, the apical one longitudinally stri- 

 ated; the base fringed with long silvery-white hair. 



Hab. Australia. 



116. THYNNUS QUADRATUS. B.M. 



Female. Length 3 lines. Head and thorax anteriorly fer- 

 ruginous ; thorax posteriorly, legs, and abdomen obscure fusco- 

 ferruginous ; thorax oblong -quadrate, constricted between the 

 meso- and metathorax, the latter vertically truncate, the upper 

 margin of the truncation rounded ; the second segment of the 

 abdomen transversely furrowed in the middle. 

 Hab. Australia. 



117. THYNNUS SULCATUS. B.M. 

 Female. Length 4 lines. Head, thorax, and legs pale rufo- 

 testaceous ; abdomen fusco-ferruginous, palest towards the apex ; 

 the front very prominent, with a broad deep sulcation on each 

 side ; the metathorax oblique, smooth and shining. 



Hab. Australia. 



