222 REVISION OF THE THYNNID^E OF AUSTRALIA, II., 



anteriorly, punctured-rugose, apical margin raised, with a deep 

 transverse groove before apex, which gives the appearance of a 

 •second transverse carina when the segment is viewed from 

 behind. Second segment with about thirteen transverse carina?, 

 those at base much less elevated and more irregular than those at 

 apex. The three following segments smooth at base, with large 

 scattered punctures at apex. Pygidium narrow, contracted 

 before base of posterior truncation, transversely striated between 

 diverging marginal carina? to near apex of epipygium which is 

 dilated into a curved process on each side; hypopygium rounded 

 and narrowly emarginate in middle at apex, projecting very little 

 beyond epipygium. Fifth segment beneath obliquely rugose- 

 striate. Entirely chestnut-brown. Length 14 mm. 



Hab. — Melbourne (French); Albany, W. A. (West wood). 



I see no reason to doubt the correctness of the pairing in this 



<?ase. 



174. T. flaviventris Guer. 



Thynnus flaviventris Guer., "Voy. Coq. Zool. ii. 2, p. 229, 1830 

 [1839](<J); Guer., Mag. de Zool.xii. p.7,P. 101, ngs.21-23,1842(<J). 



The two apical abdominal segments seem always to be black, 

 and the wings fusco-hyaline. The species varies much in size, 

 Guerin's figure representing an unusually small specimen; most 

 specimens are quite as large as T. shuckardi. In Guerin's 

 figure of the hypopygium the basal prominence is not shown, but 

 I have little doubt that this a mistake. 



The probable female differs from that of T. shuckardi, but as I 

 do not feel much confidence in the correctness of the pairing, I 

 think it best to leave it undescribed. 



Hab. — Swan River. 



175. T. varipes Sm. 



Thynnus varipes Sm., Cat. Hym. B.M. vii. 67, 1859(<J). 

 Thy anus vespoides Sm., Descr. n.sp. Hym. 165, 1879( C J). 

 Thynnus indistinctus Sm., Descr. n.sp. Hym. 169, 1879( C J). 

 Thynnus substituted Schulz, Spolia Hymenopterologica, p. 160, 

 1906 (<£). 





