1910.] F0SS0RIAL WASPS OF AUSTRALIA. 271 



apical margin. Pygidium elongate, vertical, the sides almost 

 parallel, more than twice as long as broad, the sides raised into 

 marginal carina? at the base, a few fine longitudinal strise at the 

 base, rounded at the apex. Fifth ventral segment rather coarsely 

 punctured. Intermediate tibia? shallowly emargina,te near the 

 base beneath and produced at the apex of the emargination into 

 a short stout spine directed towards the base ; intermediate tarsi 

 slender. 



Testaceous brown ; the head ferruginous brown ; the apical 

 depressed portions of the abdominal segments luteous. 



Length 6 mm. 



Hah. South Perth, W. A. {H. M. Giles). S $ i* 1 C0 P- January. 



" On Leptospermum bloom." 



The head of the female is shaped as in marginalia Westw., but 

 in that species there is no spine on the intermediate tibia? and 

 the first abdominal segment is much more narrowly depressed at 

 the apex. In trifidus Westw. the head is much larger, but there 

 is a similar spine on the intermediate tibia?. 



Glaphyrothynnus trifidus Westw. 



Thynnus trifidus Westw. Arcana Ent. ii. p. 119 (1844), <? . 



2 . Head large, less than twice as broad anteriorly as long, 

 rounded at the posterior angles, but not so strongly as in 

 sitiens and margincdis, shining, very minutely punctured, with 

 a distinct, longitudinal, frontal sulcus and a few large punctures 

 round the base of the antenna?. Thorax shining, very minutely 

 punctured ; the pronotum twice as broad anteriorly as long, 

 narrower than the head and narrowed a little posteriorly, the 

 anterior and lateral margins with a few long greyish hairs. 

 Scutellum transverse and short. Median segment distinctly longer 

 than the scutellum, broadened from the base and very steeply 

 sloped posteriorly. Abdomen with a few sparse punctures ; the 

 dorsal surface of the first segment divided transversely, the basal 

 portion raised and distinctly longer than the strongly depressed 

 apical portion ; second segment with four transverse carina?, 

 including the recurved apical margin ; segments 3-4 with a 

 raised, curved mark on each side before the depressed apical 

 margin. Pygidium vertical, very feebly recurved at the apex, 

 elongate-ovate, twice as long as the greatest breadth, longitudinally 

 striated on the basal half, narrowly sub truncate at the apex. 

 Fifth ventral segment punctured-rugose. Intermediate tibia? 

 beneath with a spine directed towards the base, emarginate 

 between the spine and the base. 



Fuscous ; the mandibles, antenna?, and legs testaceous brown ; 

 the sides and depressed portions of the abdominal segments pale 

 luteous. 



Length 9 mm. 



Rah. Oottesloe, near Fremantle, W. A. (H. M. Giles), tf $ in 

 cop. December. 



" On Eucalyptus bloom." 



