218 REVISION OF THE THYNNID.fi OF AUSTRALIA, II., 



more closely beneath. Fifth segment beneath longitudinally 

 striated. Pygidium truncate posteriorly, slightly narrowed 

 before truncation and transversely striated, surface of truncation 

 smooth, faintly emarginate at apex. Black; depressed marks on 

 pronotum, base of first abdominal segment above truncation, a 

 band interrupted in middle near base of second, a transverse 

 mark on each side on third and a minute spot on each side of 

 fourth yellow. Length 16-25 mm. 



Another specimen has the yellow bands on the second and 

 third segments continuous, and almost the whole of the pronotum 

 and mesonotum yellow. A male from Cooktown has the wings 

 darker and flushed with purple. 



Hah. — Cairns, Q. (Turner; <j£ in cop.); Cooktown( Brown; ft). 



167. T. FENESTRATUS Sm. 



T/iyniuisfeneslratusSm.,C-dt.E.ym.BM.\ii.ipA8 1 n.27, 1859 (ft). 



Thynnus crassipes Sm., I.e. p. 44, n.123, 1859 (Q). 



ft. Clypeus truncate anteriorly, sparsely and coarsely punctured, 

 labrum emarginate at apex, head and thorax finely punctured 

 rugulose; median segment covered with long pubescence, truncate 

 posteriorly, postscutellum not quite reaching base of truncation. 

 First abdominal segment obliquely truncate anteriorly, beneath 

 with a prominent carina from base to apex, a triangular trunca- 

 tion at apex and a groove between first and second segments. 

 Dorsal plate of apical segment longitudinally rugose; a short 

 blunt spine on each side of sixth segment beneath at apical 

 angles. Hypopygium with a projection on each side near basal 

 angle, thence gradually narrowed towards apex, then narrowly 

 produced to base of apical spine. 



£. Head very strongly punctured on front, smooth on vertex, 

 posterior angles only slightly rounded; pronotum of the same 

 breadth as head, nearly as long as broad, broadly emarginate 

 anteriorly, not narrowed posteriorly, smooth with a row of large 

 punctures along anterior margin, each with a hair springing from 

 it. Median punctured, with long hairs, obliquely truncate pos- 



