1908.] AUSTRALIAN- FOSSORIAL WASPS. 513 



Posterior ocelli as far from the anterior ocellus as from each 

 other, neai-ly half as far again from each other as from the eyes. 

 Head opaque, the front closely covered with golden pubescence. 

 Pronotum about two-thirds of the breadth of the head, the 

 posterior margin straight, the angles not rounded, covered with 

 pale shining pubescence. Thorax opaque. Median segment as 

 long as the mesonotum, with sparse golden pubescence, silvery on 

 the sides, obscurely obliquely striated, with a median carina ; tiie 

 posterior truncation irregularly transversely striated, with a 

 median svilcus, the sides closely and finely punctured. Abdomen 

 ovate, very minutely and closely punctured, the sides and apical 

 margins of the segments covered with short golden pubescence, 

 the pubescence at the apical angles of the basal segment silvery. 

 The first segment is subtruncate at the base, the second is the 

 longest and broadest. 



Black ; the mandibles ferruginous ; the spines of the tibiae, the 

 tarsal ungues, and the apical margin of the abdominal segments 

 very narrowly fusco-ferruginous. Wings hyaline, iridescent, 

 clouded with fuscous at the apex ; the nervures black. 



The first recurrent nervure is received by the first cubital cell 

 very near the apex, the second is interstitial with the second 

 transverse cubital nervure. The third cubital cell is three times 

 as long on the cubital as on the radial nervure. 



Length 8 mm. 



Hah. Victoria [French). 



Allied to P. marginatum Sm., from which it may be dis- 

 tinguished by the more shallow emargination of the eyes, the 

 front is also much narrower. As in marginaMmi the two or 

 three apical joints of the antenna? are slenderer than the pre- 

 ceding ones. The allied West- Australian species tibiale is a much 

 stouter built insect with a much shorter median segment. The 

 median segment is also longer than in. . P . similUmimi Sm., in 

 which species the eyes are deeply emarginate as in P. marginatutn. 



PiSON VIROSUM, sp. n. 



5 . Clypeus large, not more than twice as broad as long at the 

 broadest point, narrowed towards the apex, where it is sub- 

 truncate, feebly convex, clothed with dull golden pubescence. 

 Head and thorax opaque ; the front broad, with a shallow, longi- 

 tudinal, median sulcus above the base of the clypeus, not nearl}^ 

 reaching the anterior ocellus. Eyes separated at the base of the 

 clypeus by a distance half as great again as that separating them 

 on the vertex ; the emargination shallow and rather broad, not 

 equal in depth to the length of the first joint of the flagellum. 

 Posterior ocelli a little further from each other than from the 

 eyes, with a delicately impressed ti-ansverse line above and 

 touching them. Antennae as long as the thorax and median 

 segment combined, inserted near together, twice as far from the 

 eyes as from each other, very slightly thickened to the apex ; 

 the second joint of the flagellum as long as the scape, twice as 



33* 



