BY ROWLAND E. TURNER. 201 



148. T. VENTRALIS Sm. 



Thynnus ventralis Sm., Trans. Ent. Soc. London (3) ii. 5, p. 389, 

 1865. 



Thynnus smithii Frogg., Proc. Linn. Soc. N.S.Wales(2) vi.p.16, 

 1891(<J). 



Thynnus conspicuus Sm., Brenchley's Cruise of the Curacoa 

 p.457, P.43, fig.3, 1873((J)[nec T. conspicuus Sm., Trans. Ent. Soc. 

 1868]. 



Thynnus wackernellii D.T., Cat. Hym. viii. 118, 1897((J). 



Homalothynnus eburneus Enderlein, Zool.Anzeiger,xxvii.p.468, 

 1904. 



(J. Clypeus punctured, anterior margin almost straight between 

 the toothed apical angles, base narrowly truncate, joined by a 

 continuation of the interantennal prominence. A short longi- 

 tudinal sulcus from anterior ocellus. Pronotum broadly emar- 

 ginate anteriorly. The scutellum and postscutellum overlap the 

 median segment, projecting beyond the vertical truncation. 

 Abdomen conical. The whole insect shining, smooth, with 

 minute punctures, abdomen more strongly punctured beneath. 

 Dorsal plate of apical segment longitudinally striated above, 

 emarginate at apex. Hypopygium obliquely striated above, 

 punctured beneatb, with a lateral tooth on each side near base, 

 apical margin narrowly truncate with a strong apical spine. 

 Apical margin of hypopygium varying a little in form as in T. 

 dentatus. 



Q. Head almost smooth, with a large shining depression on 

 each side above base of antennse, the broad ridge between the 

 depressions with a longitudinal carina and raised marginal 

 carinse; a small space above each depression coarsely punctured, 

 with a few long hairs. Pronotum sparsely punctured, narrowed 

 posteriorly, anterior margin straight, posterior margin broadly 

 emarginate. Mesothorax almost smooth, a small cluster of 

 punctures with a few long hairs near base. Median segment 

 short, almost vertically truncate posteriorly, sparsely punctured. 

 Abdominal segments almost smooth above, the first vertically 



