78 Mr. R. E. Turner on Fossorial Hi/menoptera. 



margins almost parallel. Antennae rather long, the third 

 joint oP the flagellum a little longer than the second. Poste- 

 rior ocelli farther from each other than from the ej'es. 

 Head and thorax very finely and closely punctured, the 

 transverse groove at the base of the scutellum broad and 

 foveolate. A distinct vertical carina from the prothoracic 

 tubercles not quite reaching the sternum ; mesopleurae 

 finely punctured. Basal area of the median segment well 

 defined, with very strong longitudinal strise ; the sides of 

 the dorsal surface irregularly and coarsely striated, the sides 

 of the segment finely obliquely striated. First abdominal 

 segment not at all constricted at the apex, the second seg- 

 ment not more than half as broad again at the apex as the 

 first ; second ventral segment angular at the base ; abdomen 

 opaque, very finely and closely punctured ; pygidial area 

 elongate, not very broad. Fore tarsi distinctly, but not 

 strongly ciliated, hind tibiae smooth. Third abscissa of the 

 radius nearly half as long again as the second, both recurrent 

 nervures received by the second cubital cell, first transverse 

 cubital nervure not branched ; cubitus of hind wing origi- 

 nating at a distance beyond the transverse median nervure 

 not quite equal to the length of that nervure. 



Hub. Between Yallingup and Busselton, S.W. Australia ; 

 September. 



Except in the somewhat more strongly ciliated fore tarsi 

 and the rather narrow pygidial area, this species does not 

 difi'er appreciably in structure from the European mystaceus, 

 Linn. 



Arpactus secernendus, sp. n. 



5 . Nigra ; mandibulis, clypeo apice, antennis, jorouoto linea trans- 

 versa, callis humcralibus, tcgulis, segmentis abdomiualibus prirao 

 sextoquo, pedibusque ferrugineis ; segmentis 2-5 dorsalibus et 

 ventralibus fascia angusta apicali fusco-ochracea ; alis hyalinis, 

 venis ferrugineis. 



Long. 9 mm. 



? . Eyes not converging towards the clypeus, antennae 

 inserted as far from each other as from the eyes, the second 

 joint of the flagellum no longer than the third. Clypeus 

 narrowly transversely depressed on the apical margin, poste- 

 rior ocelli a little farther from each other than from the 

 eyes. Head and thorax finely and closely punctured, a 

 vertical carina from the pronotal tubercles not extending to 

 the sternum ; a deep foveolate groove at the base of the 

 scutellum ; basal area of the median segment smooth, with a 



