541: Mr. R. E. Turner on FossorlaJ Hymenoptera. 



angles ; seventh dorsal segment longitudinally rugose, pro- 

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

 with several curved striae helow the apex of the dorsal plate 

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

 blunt apical spine, and produced strongly at the basal angles 

 into blunt lobes. Anterior coxse 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 ang'es, shining and almost smooth, 

 coarsely punctured in the middle of the front. Pronotuni 

 tiuely 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, ab;)ut 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 caringe, 

 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. Intern)ediate tibiie moderately stout, basal 

 joint of intermediate tarsi slightly broadened. 

 Hub. Brisbane (//. 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 which are much smaller, it bears a strong superficial 

 reseujblance to Diniorphothynnus hdemorrhuidalis, Guer. The 

 female diti'ers from most species of the genus in the absence 

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

 resembling Z. dilatatus, Sm. 



Thynnus mutundus, sp. n. 



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

 duabus supra antennas, vertice liuea transversa utrinque, prouoto 

 marginibus, tegulis, pleuris, mesonotolinea longitudinali discoidali 

 utrinque, scutello linea curvata interrupta, postscutello, segmeuto 

 mediano linea nigra longitudiuali utrinque, segment is dorsalibus 

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



