BY ROWLAND E. TURNER. 203 



broad at base, with a spine on each side, thence sharply narrowed 

 to apex, the apical angles produced into short spines, with the 

 usual central spine. Ferruginous-brown; mandibles, clypeus and 

 posterior margin of pronotum yellow; scutellum fuscous at base 

 and apex; abdominal segments with a pale ferruginous transverse 

 band on each side. Wings hyaline, nervures fuscous. Length 

 about 18 mm. 



Hab. — Australia(Banks). 



The type, probably taken at Cooktown, seems to be stilLunique. 

 The hypopygium resembles that of T. dentatus. 



150. T. pedestris Fab. 



Tiphia pedestris Fab., Syst. Ent. p. 354, 8, 1775(9). 

 Myrmecodes pedestris Latr., Gen. Crust, et Insect, iv. p. 118, 

 n.521, 1809(9)[nec Ashm., Canad. Ent. xxxv.]. 



9. Head shining on vertex with a few shallow punctures; 

 front with a large and very shallow depression on each side 

 divided by a faint longitudinal carina, the carina clothed with 

 long hairs, a few long hairs on the depressions. Thorax shining, 

 with sparse and scattered punctures; pronotum short, rather 

 narrower than head, straight on anterior margin, strongly and 

 broadly emarginate posteriorly. Median segment very short, 

 almost vertically truncate from just behind mesonotum, angles at 

 base of truncation prominent. Head black; front and outer 

 margin of eyes yellow. Thorax yellow above, margins of pro- 

 notum black. Tibise and tarsi yellow. [Abdomen missing]. 



Hab. — Australia(Banks). 



This is the female of a Thynnus of the typical group, but the 

 depressions on the front are not deeply excavated as in T. dentatus, 

 and the pronotum is shorter and more deeply emarginate pos- 

 teriorly. It is nearer to T. vernalis described by me in this 

 paper, and may prove to be the opposite sex of T. emarginatus 

 Fab. Ashmead's remarks on Myrmecodes pedestris seem to refer 

 to T. apterus Oliv. 



