262 MR. R. E. TURNER ON THE [Feb. 15, 



near the apex. Seventh dorsal segment very narrow at the apex. 

 Hypopygium ending in a recurved spine, shortly and less strongly 

 recurved than is usual in the genus. Second recurrent nervure 

 interstitial with the second transverse cubital nervure ; the second 

 cubital cell about two-thirds as long as the third on the radial 

 nervure; the division of the first cubital cell clearly marked. 



Opaque black ; the spines of the tibia? and tarsi testaceous. 

 "Wings fusco-hyaline, nervures black, stigma fuscous. 



Length 15 mm. ; exp. of wings 24 mm. 



Hob. Hermannsburg, Central Australia (H. J. Hillier). April. 



A very distinct species, shorter and more stoutly built than is 

 usual in the genus. The female will probably prove to belong to 

 Rhytidog aster Turn, rather than to Rhagigaster ; but the males 

 of the two groups are not distinguishable with any certainty, and 

 I think Rhytidogaster must sink. 



Rhagigaster corrugatus, sp. n. (Plate XXXI. figs. 1 tf , 2 $ .) 



6 . Clypeus finely and closely punctured at the base and on 

 the sides, with a short longitudinal carina from the base, which 

 branches before the middle into two almost obsolete carinas, these 

 enclosing with the apical margin a shining triangular space 

 marked with a few large and sometimes confluent punctures ; the 

 apical margin almost straight, very broadly and feebly emarginate. 

 Antennas scarcely as long as the thorax without the median 

 segment, of almost even thickness throughout, inserted further 

 from each other than from the eyes. "Vertex shining, rather 

 strongly punctured, with an almost obsolete longitudinal carina 

 behind the ocelli ; front coarsely rugose, with an arched carina 

 not extending to the eyes below the anterior ocellus and a broadly 

 V-shaped carina between the antennas, the branches not extending 

 to the arched carina. Thorax closely and rather strongly punc- 

 tured ; the pronotum nearly as broad as the head ; the anterior 

 margin straight and raised, with a shallow groove behind it, the 

 anterior angles moderately prominent. Scutellum subtriangular, 

 narrowly truncate at the apex. Median segment rounded, finely 

 and closely punctured. Abdomen elongate, nearly half as long 

 again as the head and thorax combined, shining, strongly but not 

 very closely punctured, much more closely than in R. unicolor 

 Guer. ; the segments strongly constricted near the base, the base 

 of the segments where visible closely and very minutely punctured. 

 First ventral segment with a small acute tubercle at the base. 

 Seventh dorsal segment sharply depressed at the apex and pro- 

 duced into a small, flattened, smooth plate, rounded at the apex ; 

 the hypopygium not extending much beyond the dorsal process, 

 forming a very sharply recurved spine with a minute spine on 

 the upper surface and without lateral spines at the base. Second 

 recurrent nervure received close to the base of the third cubital 

 cell, nearer the base than in R. tmicolor. 



Black, with sparse whitish pubescence; the pubescence on the 

 head cinereous. Wings very pale fusco-hyaline, faintly flushed 



