224 REVISION OF THE THYNNID^ OF AUSTRALIA, II., 



without a spine at apical angles. Hypopygium with a spine on 

 each side near base, thence produced in an elongate-triangular 

 form to the apical spine, which is faintly recurved. Smith's 

 description as to colour is sufficient. 



9. Head almost smooth, front between antennas punctured, 

 with a short median sulcus, strongly rounded to posterior margin. 

 Ctypeus broadly emarginate at apex. Thorax punctured, pubes- 

 cent, pronotum with the anterior margin straight, nearly twice 

 as broad as long, not very strongly narrowed posteriorly. Median 

 segment short, very finely punctured, obliquely truncate pos- 

 teriorly. Abdomen sparsely punctured, the segments smooth at 

 base, first segment vertically truncate anteriorly, with a low 

 transverse carina before apex; second segment smooth at base, 

 then crossed by four transverse carinas, the basal one the least 

 prominent, space between apical carina and the slightly recurved 

 apical margin of segment delicately transversely striated. Pygi- 

 dium smooth at base, then strongly contracted, the middle of the 

 contracted portion elevated, with marginal carinas, sides concavely 

 depressed and obliquely striated; truncate posteriorly, elongate- 

 oval, the margins raised, epipygium considerably shorter than 

 hypopygium, truncate at apex with a spine projecting at right 

 angles close to base of truncation. Fifth segment beneath smooth 

 at base, coarsely rugose at apex. Black; mandibles, antennas, 

 legs and apex of epipygium ferruginous; basal half of first four 

 abdominal segments nearly reaching apical margin on sides, a 

 broad band on each side of fifth segment, a spot on each side of 

 second, third and fourth segments beneath and the whole of fifth 

 beneath yellow. Length 14 mm. 



Hab.— S.W. Australia(Worsfold; $); 9 in Coll. Brit. Mus. 



177. T. FLAVOFASCIATUS Sm. 



Thynnus flavofasciatus Sm., Cat. Hym. B.M. vii. 45, 1859(9). 



9. Head rather small, convex, almost smooth, with a short 

 longitudinal sulcus between antennae. Thorax and median 

 segment almost smooth, pronotum with a few large punctures 





