44 HYMENOPTERA. 



123. THYNNUS CRASSIPES. B.M. 



Female. Length 5 lines. Black : head shining, with large 

 deep punctures; thorax smooth and shining in front, the an- 

 terior margin incurved to the form of the head; metathorax 

 punctured, obliquely truncate, and covered, as well as the base 

 of the abdomen and the legs, with glittering white pubescence ; 

 the femora and tibiae incrassate ; the two basal segments of the 

 abdomen with deep transverse furrows ; the apical segment com- 

 pressed, forming above a flattened oblong surface, narrowest 

 at the base, which is grooved in curves transversely ; the apex 

 with a semicircular thin membrane. 



Ha b. Australia. 



124. THYNNUS L^BVICEPS. B.M. 

 Female. Length 4 lines. Dark red-brown : the head and 



thorax in front smooth and shining ; the metathorax oblique 

 and strongly punctured, sprinkled with silvery hair, as are also 

 the legs and base of the abdomen ; the truncated portion of the 

 abdomen punctured, above smooth and shining ; the second 

 segment transversely striated ; the apical segment longitudinally 

 striated. 



Hab. Australia. 



125. THYNNUS SERRIPES. B.M. 

 Female. Length 4 lines. Black : the legs ferruginous, the 



coxae black, the intermediate and posterior tibiae serrated ex- 

 ternally and covered with rigid setae, the posterior tarsi fuscous ; 

 the head and thorax with distant punctures; the metathorax 

 truncate, its upper surface semicircular ; the abdomen with scat- 

 tered punctures; the second segment irregularly transversely 

 striated, the apical segment longitudinally so. 



Hab. Australia. 



126. THYNNUS SIGNATUS. B.M. 



Female. Length 4J lines. Ferruginous : the abdomen with 

 five broad yellow fasciae, the three apical ones slightly inter- 

 rupted ; all the fasciae with a ferruginous spot or line at their 

 lateral margins ; the head and thorax punctured ; the metathorax 

 blackish. 



Hab. Australia. 



127- THYNNUS PUNCTATUS. B.M. 



Female. Length 4 J lines. Head and thorax brownish -black ; 



the abdomen black, entirely covered with punctures, those on 



