Neiv Fossorial Hymenoptera from A%istralia. 423 
the apical joint equal in lengtli to the tenth and rounded at the 
apex ; the base of the antennae separated from the base of the 
clypeus by a distance equal to the length of the third joint of the 
flagellum. Ocelli in a very broad triangle, the posterior pair fully 
half as far again from the eyes as from each other; the eyes 
separated from the posterior margin of the head by a space nearly 
equal to their greatest breadth. Thorax much narrower than the 
head, longitudinally rugose-striate on the mesonotum and scutellum, 
pleurae rugosely punctured. Median segment and abdomen strongly 
punctured, the triangular space at the base of the median segment 
smooth. First abdominal segment short, more than half as broad 
again as long ; pygidial area rather broadly truncate at the apex, half 
as broad again at the base as at the apex, finely granulate. 
Reddish orange ; the vertex, mandibles, mesonotum, pleurae, 
thorax beneath, the apex of the median segment in the middle, the 
third and fourth abdominal segments and the apex of the pygidial 
area black. Wings flavo-hyaline, with a fuscous cloud along the costa 
near the apex, nervures ferruginous. Length 16 mm. 
^. Differs from the female in the following points: front, 
mesonotum and scutellum closely punctured, the triangular space at 
the base of the median segment transversely striated, the middle lobe 
of the clypeus much longer than broad, without tubercles in the 
middle and not depressed at the apex, the antennae separated from 
the base of the clypeus by a distance equal to the length of the 
first and second joints of the flagellum combined, and the extent of 
the black area on the vertex and median segment is much less. 
Length 14 mm. 
Hah. Queensland, Cairns ex coll. Ferhins) ; Moreton 
Bay ($ ex coll. F. Smith). 
I think there can be no doubt that these are sexes of 
the same species. 
Cerceris perhinsi, sp. nov. (Plate L, fig. 12.) 
9. Clypeus short, strongly porrect and broadly emarginate at 
the apex, coarsely punctured, smooth and shining at the base. 
Mandibles shining, with a broad triangular tooth on the inner 
margin near the middle. Head much broader than the thorax, 
closely and deeply punctured, the punctures on the front confluent 
longitudinally. Antennae inserted near together on the front, fully 
twice as far from the eyes as from each other and half as far again 
from the anterior ocellus as from the base of the clypeus ; the 
second joint of the flagellum a little longer than the third. The 
frontal carina is broad at the base of the clypeus, narrow and 
