172 REVISION OP THE THYNNIDiE OP AUSTRALIA, II., 



Abdomen fusiform, not very much narrowed at base, first segment 

 with a median carina beneath and a deep groove between first 

 and second segments. Segments 2-4 with a delicate transverse 

 carina near base, followed by a deep transverse line; second 

 segment beneath with a prominent tubercle at base. All the 

 segments finely and closely punctured. Hypopygium broad, with 

 a subtriangular projection on each side near basal angles, thence 

 triangularly produced to apical spine. Black; the two apical 

 abdominal segments ferruginous-red. Wings hyaline, nervures 

 black. Length 15 mm. 



Hah. — Fremantle, W.A. 



Type in Brit. Mus.(collected by Commander Walker). 



110. T. (LOPHOCHEILUS) AMBIGUUS, n.sp. 



£. Clypeus strongly convex, broadly truncate anteriorly, deeply 

 punctured, with a carina from base to apex. Head finely and 

 closely punctured, with a faint carina from anterior ocellus to 

 base of clypeus. Antennae as long as thorax and median 

 segment combined. Thorax finely and closely punctured; median 

 segment very delicately rugulose, Abdomen slender at base, 

 shining, finely and shallowly punctured; segments 2-5 with an 

 impressed transverse line near base and a faint, raised, curved 

 mark on sides near apical margin; the apical segment rugose, 

 with a few rounded striations at apex. Hypopygium elongate- 

 triangular, with a very short curved apical spine. Black; tibiae 

 beneath light ferruginous Wings hyaline, tinted with yellow, 

 nervures black. Length 13 mm. 



9. Head convex, about half as broad again as long, rounded 

 at posterior angles. The whole insect sparsely punctured. Pro- 

 notum rather narrower than head, rectangular, much broader 

 than long. First abdominal segment truncate anteriorly, apical 

 margin raised, with a groove before it giving the appearance of 

 a transverse carina before apex. Second segment with five 

 transverse carinas of about even elevation, including the recurved 

 apical margin. All the segments smooth at base. Pygidium 

 narrow, almost vertically truncate posteriorly, longitudinally 



