^46 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.49. 



Genus PISON Jurine. 



PISON AUREOSERICEUM, new species. 



This may be a dark form of Pison peletieri Le Guillon, but as all of 

 the specimens have the second dorsal mostly black and Le Guillon's 

 description is very short, it is impossible to say with certainty. The 

 following points will serve to separate this species from virosum 

 Turner: Space between antennae subequal with space between 

 antenna and eye; postocellar and ocellocular hnes equal; no median 

 sulcus on the front; larger; etc. P. aureosericeum may belong to 

 the same group as marginatum Smith and auriventra Turner, but it 

 does not agree with the descriptions of either of these. From Pison 

 aurifex Smith, to which aureosericeum seems to be closely related, it 

 may be separated by the facial pubescence extending to the vertex; 

 the femora and trochanters entirely ferruginous; and first dorsal seg- 

 ment is nearly all ferruginous. 



Female. — Length 11 mm. Clypeus about twice as wide as long, 

 apex truncate, sides hardly angled; distance between antennae at 

 base subequal with the distance between an antenna and eye; no 

 median frontal sulcus; the distance between the eyes at clypeus not 

 quite twice as great as at distance between them at the vertex; 

 emargination of eyes not quite twice as deep as the length of pedi- 

 cellum; third antennal joint distinctly longer than the fourth; oceUi 

 in an acute triangle; postocellar and ocellocular lines subequal; head 

 with fine, distinct punctures, which are quite close on the front; pro- 

 no turn rounded, but little below the top of mesonotum; mesonotum 

 with the punctures larger and more separate than those of the head; 

 dorsal aspect of the propodeum with a strong median sulcus in which 

 there is a carina, and obliquely striato-punctate; posterior face of the 

 propodeum strongly, transversely striate, and with a partial median 

 sulcus; abdomen finely punctured, first and second dorsal segments 

 feebly depressed apically, and the second slightly constricted basally; 

 recurrent veins and transverse cubiti interstitial; petiole and second 

 cubital cell subequal in height; third cubital about twice as long on 

 the cubitus; transverse median distinctly beyond the basal. Black; 

 mandibles, palpi, three basal joints of antennae, tegulae, legs below 

 coxae, first dorsal segment except a spot at base and apical margins 

 of the following segments ferruginous; insect abundantly clothed 

 with golden pile; wings hyaUne, venation testaceous, stigma darker. 



Hale. — The male agrees well with the female except the clypeus 

 has a strong, acute median tooth. 



Duaringa, Dawson District, North Queensland, Australia. Seven 

 females and five males from W. F. H. Rosenberg. 



Type.— Cat. No. 14254, U.S.N.M. 



