544 Mr. R. E. Turner on FossoriaJ IlymenojAeva, 



angles ; seventh dorsal segment longitudinally rugose, pro- 

 duced into a very short flattened plate rounded at the apex, 

 with several curved striae below the apex of the dorsal plate 

 and above the hypopygium, which is triangular, with a short 

 blunt apical spine, and produced strojiglyat the basal angles 

 into blunt lobes. Anterior coxae slightly concave. Third 

 abscissa of the radius longer than the second ; second 

 recurrent nervure received at one-quarter from the base of 

 the third cubital cell. 



$ , Clypeus transverse, without a carina ; head small, 

 broader than long, slightly narrowed anteriorly, strongly 

 rounded at the posterior angles, shining and almost smooth, 

 coarsely punctured in the middle of the front. Pronotum 

 finely and closely punctured, half as broad again as long, 

 with a few deep setigerous punctures along the anterior 

 margin. Scutellum and median segment sparsely punc- 

 tured, about equal in length. Abdomen shining, very 

 sparsely punctured, the first dorsal segment with a narrow 

 transverse groove before the strongly raised apical margin ; 

 second segment with seven well-defined transverse carinse, 

 including the strongly raised apical margin ; fifth ventral 

 segment longitudinally rugose-striate ; pygidium vertically 

 truncate, ovate, with about five arched carinae on the basal 

 half, the apical half almost smooth, broadly rounded at the 

 apex, not constricted at the base, the ventral plate longer 

 than the dorsal. Intermediate tibiae moderately stout, basal 

 joint of intermediate tarsi slightly broadened. 

 /y«6. "Brisbane {H. Hacker) ; September. 

 The male is easily distinguished by the emarginate clypeus, 

 the very short spines of the sixth ventral segment, and the 

 colour, the latter character resembling that of the West- 

 Australian species Z. crudelis, Turn., and Z. trilobatus, Turn., 

 both of w hich are much smaller. It beai's a strong superficial 

 resemblance to Dimurphuthynnus hamorrhoidalis, Guer. The 

 female differs from most species of the genus in the absence 

 of constriction at the base of the pygidium, in this character 

 resembling Z. dilatatits, Sm. 



Thynnus mutandus, sp. n. 



J. Niger; clypeo, mandibulis, marginibus oculorum, maculis 

 duabus supra antennas, vertice linea transversa utrinque, proiioto 

 marginibus, tegulis, pleuris, mssouoto linea longitudinali discoidali 

 utrinque, scutello linea curvata interrupta, postscutello, segmento 

 mediano linea nigra longitudinali utrinque, segmentis dorsalibus 

 1-6 fascia lata transversa utrinque, segmentis vcntralibus 1-6 



