180 REVISION OF THE THYNNIDiE OF AUSTRALIA, II., 



120. T. (LOPHOCHEILUS) FLAVIFRONS Sm. 



Rhagigaster flavifrons Sm., Trans. Ent. Soc. London (3) ii. 5, 

 p.390, 1865(9). 



9- Head sparsely and deeply punctured on front, more finely 

 and closely on vertex, with a deep longitudinal sulcus on front, 

 half as broad again anteriorly as long, a little narrowed poste- 

 riorly, very slightly convex; eyes situated at some distance from 

 base of mandibles; clypeus transverse, with a carina from base 

 to apex. Thorax and median segment sparsely and deeply punc- 

 tured, minutely and closely punctured between the larger 

 punctures; pronotum nearly as broad as head, much broader than 

 long, subrectangular; median segment broadened and oblique 

 posteriorly, but not strongly truncate. Abdomen very delicately 

 punctured, with a few large and scattered punctures ; first 

 segment narrow and truncate at base, widened to apex; second 

 segment wider at apex than at base, transversely rugose at base, 

 with low, irregular, transverse carinse at apex, the apical margin 

 raised; a small tuft of fulvous hairs close to apical angles of fifth 

 segment. Pygidium rather small, vertically truncate, rarely 

 twice as long as broad, sides almost parallel, produced into a 

 short spine on each side just before rounded apex, longitudinally 

 striated, almost smooth at apex. Black; base of mandibles and 

 front of head yellow; thorax and median segment ferruginous;, 

 tarsi ferruginous-brown; pygidium fusco-ferruginous. Length 

 13 mm. 



Hab.—Swa.n River, W.A.(Du Boulay) 



I do not understand why Smith referred this species to 

 Rhagigaster. 



121. T. (Lophocheilus) obscurus Klug. 

 Thynnus obscurus Klug, Physik. Abh. Akad. Berlin, p.22, x\A r 



P.l, fig.4, 1840[1842]( < J). 



Thynnus (Thynnoides) obscurus Westw., Arc. Ent. ii. 2, p.l 38,. 

 P.82, fig.2, 1844(9). 



(J. There is a good deal of variation in the development of the 

 carina on the clypeus. I have seen a specimen in Mr. Froggatt's 



