174 REVISION OF THE THYNNID.E OF AUSTRALIA, II., 



appearance of a second transverse carina before apex. Second 

 segment with six transverse carina?, including the recurved apical 

 margin; the following segments smooth at base, finely punctured 

 at apex. Pygidium narrow, of about even width throughout, 

 obliquely truncate posteriorly, surface of the truncation longi- 

 tudinally striated. Fifth ventral segment coarsely rugose on 

 apical half with a deep central emargination. Black; second 

 abdominal segment fuscous; head and legs, except coxae and 

 trochanters, ferruginous. Length 8 mm. 



Hab. — Melbourne, Vic. In Oxford University Museum. 



Var. incertus, n.var. 



(J. Shape and sculpture as in typical T. vigilans. Black; 

 mandibles, except at apex, clypeus at apical angles and on sides 

 near base, margin of face, margins of eyes to above base of 

 antennas, a spot near eye on each side of vertex, a transverse line 

 on postscutellum, a large, transverse mark on each side of the 

 five basal abdominal segments, and a smaller spot on each side 

 of the sixth yellow. Length 18 mm. 



Hab. — Australia (Higgins). Type in Oxford University 

 Museum. 



Differs from T. vigilans in the much larger extent of the yellow 

 markings on the abdomen, and in the larger size. It seems to 

 be fairly constant, as more than one specimen from the same 

 source shows a similar extension of the coloured areas. 



113. T. (Lophocheilus) cognatus Sm. 



Thynnus cognatus Sm., Cat. Hym. B.M. vii. p 28 y n.71,1859( ( J). 



J. Clypeus long, convex, and rather broadly truncate at apex. 

 Head small. Median segment very finely and closely punctured. 

 Abdomen elongate, subpetiolate, shining, with a few scattered 

 punctures; first segment very long. Hypopygium with a rounded 

 prominence on each side at basal angles, thence elongate-triangular, 

 with an acute apical spine. Otherwise as in Smith's description. 



Hab. — S. E. Australia. 



From a collection made between Sydney and Brisbane, and in 

 S. Australia (Stutchbury). 



