of Fossorial Hymenoptera. 295 



from tlic scutellum forwards, covered with pale golden pile ; 

 the metathorax at the sides and behind Avith a covering of 

 bright silvery pile ; the legs stout ; the tibia? and tarsi thickly 

 spinose. The apical margins of the segments of the abdomen 

 with bright silvery fasciae, the fascia? widen both in the middle 

 and at the sides ; the apical segment with divergent stria?. 



Male. About 6 lines long. Body and legs more slender ; 

 the head and thorax more pubescent ; wings the same as in 

 the other sex ; the basal segment of the abdomen covered 

 with silvery pile ; the other segments fasciated, the apical 

 one pilose. 



Hob. South Australia. 



Genus PiSON, Spin. 



Pison maculipennis. 



Female. Length 5 lines. Black, with the thorax, legs, and 

 basal segment of the abdomen ferruginous ; wings with two 

 large fuscous macula?. Head : the scape and four basal joints 

 of the tlagellum of the antenna?, the clypeus, and mandibles 

 ferruginous, the latter black at their tips ; the head above the 

 clypeus, as high as the insertion of the antenna?, and the 

 orbits of the eyes with glittering pale golden pubescence. 

 Thorax : the posterior margin of the prothorax, of the meso- 

 thorax, a line on each side of the postscutellum, and the base 

 of the metathorax adorned with golden pubescence, on the 

 sides of the latter it is inclined to silvery brightness ; the 

 sides of the metathorax and the postscutellum black ; wings 

 flavo-hyaline, with a dark fuscous macula occupying the 

 externo-median cell, and extending more or less into the 

 posterior wing ; another occupying the marginal cell ; the 

 nervures surrounding these macula? black, the rest of the 

 nervures and also the stigma pale testaceous ; the apical 

 joints of the intermediate and posterior tarsi fuscous. Abdo- 

 men : the apical margins of the two basal segments, and 

 sometimes of the third (much more narrowly) , yellowish white ; 

 the second segment more or less black at the base. 



Hab. Brazil (Ega and Para). 



Pison pilosus. 



Female. Length 4 lines. Black ; the abdomen shining, 

 and covered with a pale golden pile, that on the legs silvery. 

 Head : the cheeks and inner orbits of the eyes with bright 

 silvery pile ; the mandibles ferruginous at their apex. Thorax 

 shagreened ; the sides of the metathorax with a thin white 

 pubescence ; wings hyaline and brilliantly iridescent ; the 



