542 Mr. R. E. Turner on Fossorial Ilymenoptera. 



Genus Phymatothynnus, Turn. 

 Key to the Tasman'ian Species. 



Tibine and tarsi ferruginous ; mandibles, apex of 



clypeus, lines on pronotum " and on post- 



scutellum j^ellow P. dereliclus, Tarn. 



Entirely black P. motiilicornis, Sm. 



Pronotum much longer than wide, not subcarinate 



in the middle posteriorly P. derelictus, Turn. 



Pronotum onlj' a little longer than broad, subcari- 

 nate in the middle on the posterior half .... P, vionilicovnis, Sm. 



Phymatothynnus montlicornis, Sm. 



Thynnus [Agriomyici) monilicornis, Sm, Oat, Hym. B.M. vii, p. 39 

 (1859). cJ$. 



This was described from Victoria, but there is a pair in 

 the Biitish Museum from Tasmania sent by Mr. A. Sinison 

 probably from the Launceston district. I did not see the 

 species in Southern Tasmania. 



Phymatothynnus derelictus, sp. n. 



cJ . Black, with light fulvous pubescence ; the mandibles 

 (except at the apex), the apical margin of the clypeus broadly, 

 the margin of the interantennal prominence narrowly, a line 

 on each side on the anterior margin of the pronotum, and a 

 spot on the postscutellum pale yellow ; tegulse testaceous; 

 the tibia3, tarsi, and the apex of tbe femora ferruginous. 

 Clypeus convex, without a distinct carina, produced and very 

 narrowly truncate at the apex. Head finely and very closely 

 punctured, the interantennal prominence fairly well developed 

 and very broadly rounded at the apex, a short and shallow 

 longitudinal sulcus on the front. Thorax and median segment 

 finely and closely punctured ; abdomen shining and very 

 shallowly punctured, flattened, the segments very slightly 

 constricted at the base, the basal segment slender, very 

 narrow at the base, half as broad at the apex as the apex of 

 the second segment. Hypopygium longer than broad, very 

 slightly widened from the base, tridentate at the apex, the 

 central tooth long, the lateral ones short but distinct. Wings 

 subhyaline, nervures fuscous ; second recurrent nervure 

 received just before one-fourth from the base of the third 

 cubital cell. 



Lenoth 12 mm. 



