1908.] AUSTRALIAN FOSSORIAL WASPS. 521 



a little broader than the second ; the apical mai'gin of segments 

 1-4 with a band of pale golden pubescence interrupted in the 

 middle. 



Black ; the mandibles at the base, the antennas (except the two 

 apical joints), the tegulse, the base and apex of the first abdominal 

 segment broadly, the apical margin of the i-emaining segments, the 

 tarsi, tibiae, and the apex of the femora rufo-testaceous. Wings 

 hyaline, nervures dull rufo-testaceous. 



The first cubital cell very long, receiving the first recurrent 

 nervure very near the apex ; the second cubital cell very short 

 on the radial nervure, receiving the second recurrent nervure near 

 the base, less than three times as long on the cubital as on the 

 radial nervure. 



Length 11 mm., exp. 19 mm. 



Hah. Mackay, Queensland (^Turner). 



This species resembles the following one P. icarioides in shape, 

 but the antennae are much longer and are not thickened at the 

 apex, and the shape of the second cubital cell is very different. It 

 does not approach so nearly to Aidaco2}kilus, forming a connecting- 

 link with true Pison. 



PisoN (AuLAcoPHiLus) ICARIOIDES, sp. n. (Plate XXYI. fig. 13.) 



$ . Clypeus broadly rounded at the apex, more than twice as 

 broad as long, clothed with rather long, shining, very pale 

 golden pubescence. Front round the base of the antennae, and 

 the inner orbits of the eyes as high as the emai-gination, clothed 

 with short silvery pubescence ; a short, obscure, median carina 

 above and between the base of the antennae ; the vertex opaque. 

 Eyes rather shallowly and broadly emarginate, the distance between 

 them at the base of the mandibles about one-third greater than on 

 the vertex ; the posterior ocelli almost as far from each other as 

 from the eyes. Antennae inserted a little fuither from each other 

 than from the eyes, scarcely longer than the hea,d, much thickened 

 to the apex ; the second joint of the flagellum less than twice as long- 

 as the first and one-third longer than the third. Thorax, median 

 segment, and abdomen opaque, very minutely and closely punc- 

 tured ; the pronotum nearly as broad as the head, very gradually 

 depressed anteriorly; scutellum short and transverse. The median 

 segment rather slender, longer than the mesonotum, much 

 narrowed and rounded to the apex, not truncate, with a median 

 sulcus from the base to the apex. First abdominal segment slender, 

 nearly twice as long as it is broad at the apex, about three times as 

 broad at the apex as at the base, wdth a deep sulcus from the base 

 to beyond the middle, the apical margin strongly depressed ; 

 second segment very large, nearly three times as broad at the 

 apex as the first, strongly convex ; the apical margin of all the 

 segments depressed. 



Black ; the mandibles (except at the apex), the antennae at the 

 base, the apex of the clypeus, the tegula?, the first segment of the 

 abdomen, the apical margins of the other segments, the tibiae, tarsi, 

 and the apex of the femora dull ferruginous. The pubescence on 



