282 MR. R. E. TURNER OX THE [Feb. 15, 



radius a little longer than the third, the first recurrent nervure 

 received at three-quarters from the base of the second cubital cell, 

 the second at one-quarter from the base of the third cubital cell. 



Black ; the mandibles and the anterior margin of the clypeus 

 yellow ; the seventh abdominal segment and the sixth, except the 

 extreme base, ferruginous red ; tibiae and tarsi light ferruginous. 

 Wings hyaline, slightly tinged with yellow, nervures ferruginous 

 at the base and apex and on the costa, fuscous in the middle. 



Length 17 mm. 



Hab. Western Australia (Preiss). 



Type in Berlin Museum. 



The emargination of the clypeus is unusual in Australian 

 species. 



Hemithynnus petulans Sm. (Plate XXXI. figs. 5 <$ , 6 $ .) 



Thynnus petitions Sm. Descr. n. sp. Hym. p. 165 (1879), J • 



2 . Clypeus very broadly and shallowly emarginate at the apex, 

 with a short carina from the base not quite reaching the apex. 

 Head moderately thick, slightly convex, half as broad again as 

 long, rounded at the posterior angles, shining and sparsely punc- 

 tured, the front between the antennae coarsely punctured and 

 divided by a delicate longitudinal sulcus. Thorax subopaque, 

 closely and minutely punctured ; the pronotum nearly twice as 

 broad as long, with a row of deep setigerous punctures along the 

 straight anterior margin. Median segment as long as the scu- 

 tellum, broadened from the base and obliquely truncate posteriorly. 

 A few large scattered punctures on the scutellum and median 

 segment. Abdomen broad, nearly twice as long as the head and 

 thorax combined, smooth, with a few scattered punctures; the 

 first segment broad and short, not narrowed towards the base, 

 with three or four low and fine transverse carinas at the apex ; 

 second segment with about nine well-raised but more or less 

 irregular transverse carinas ; fifth ventral segment longitudinally 

 striated. Pygidium vertically defiexed posteriorly, the dorsal 

 plate more than twice as long as broad, coarsely longitudinally 

 striated at the base, smooth at the apex and very feebly trilobed. 



Head and thorax ferruginous red ; legs fusco-ferruginous ; 

 abdomen black, the first, third, fourth, and fifth dorsal segments 

 with a broad yellow transverse band near the apex, the second 

 dorsal segment with a large yellow spot on each side. 



Length 11-16 mm. 



Hab. South Perth, W. A. (H. M. Giles). 6 $ in cop. December 

 and January. 



" Resting on Inula shrub and Eucalyptus bloom. Not regular 

 in its appearance, some years none are seen." {Giles.) 



The female is nearly allied to those of protervus Sm. and 

 inconstans Sm., but differs from the former in the colour of the 

 head and thorax and in the shape of the first abdominal segment ; 

 from the latter species in the development of the carinas on the 

 two basal segments and in the rather narrower pygidium. 



