214 REVISION OF THE THYNNID.E OF AUSTRALIA, I., 



to the correct position of this genus, which in some respects 

 shows a relationship to typical Thynnus. But until the female 

 is known it cannot be located with any certainty. 



0. XANTHOSPiLUS Sliuckard. 



Oncorhinus xaathospilus Shuckard, in Grey's Journ. of two 

 Expeditions to N.W. and W. Australia, ii. p. 471, n.34, 1841(^). 



rj. Black; the clypeus, mandibles, a narrowly interrupted line 

 on the anterior margin of the prothorax, the tegulse, the tibiae and 

 tarsi, the femora at the apex and a spot on each side of each of the 

 abdominal segments, except the epipygium, yellow. The whole 

 insect closely and finely punctured. Wings hyaline, nervures 

 black. A small yellow spot on tlie mesopleurse. Length 28mm. 



Hah. — Albany, >S\van River, W.A. 



A specimen marked " from Shuckard's collection, almost 

 certainly the type," is in the British Museum. 



The female is unknown, but it may possibly prove that Thynnus 

 gravidus Westw. , will be found to belong to this species, both 

 showing a want of close affinity to other species, and both being 

 of rather unusual size. T. gravidus does not seem to be the 

 female of 2^. klugii Westw., as Westwood suggests. 



Genus H h a g i g a s t e r Guer. 



Rhagigaster Guer., Voy.Coq.Zool.ii p.2l:3,(1830) 1839; Westw., 

 Arc. Ent. ii. 2, p. 105, 1844; Sauss., Reise d. Nov. Zool. ii. 1, Hym. 

 p.111,1867. 



^. Clypeus with a A-shaped carina. A transverse carina 

 between the eyes. Maxillary palpi six-jointed, the basal joint 

 short, the others subequal,the labial palpi four-jointed, the labrum 

 transverse, sliort, sharply narrowed but not truncate posteriorly. 

 Epipygium usually narrow, hvpopygium ending in a long recurved 

 aculeus, with or without a spine on each side near the base 

 Mandibles bidentate. 



^. Head lectangular, with a sulca en each side from the eye 

 to the occiput. Maxillary palpi small but perfect, six-jointed, 



