1910.] F0SS0RIAL WASPS OF AUSTRALIA. 297 



stout ; the first segment truncate at the base, as broad as the 

 second, the dorsal surface with six strong transverse carina? 

 including the recurved apical margin ; the second segment with 

 the same number of carina? ; segments 3-5 shining, with a few 

 scattered punctures. Fifth ventral segment with strong broadly- 

 curved stria?. Pygidium narrowed at the base, with two or three 

 arched carina? ; steeply sloped posteriorly, with three arched 

 carina? at the base of the truncation ; the dorsal plate not reaching 

 to the apex of the ventral, broadened from the base and truncate 

 at apex ; the ventral plate rounded at the apex. Intermediate 

 tibia? very broad. 



Length 11-13 mm. 



Hah. South Perth, "W. A. (H. M. Giles). 4 pairs in cop. 

 March. 



" On Leptospermum bloom ; not common." {Giles.) 



The male hypopygium is of the same shape as that of fenes- 

 tratus Sm., and the sculpture of the two basal dorsal segments of 

 the female is very similar, though there is one carina less on each 

 segment in fenestratus . That species also has lateral lobes at the 

 apex of the dorsal plate of the pygidium, and the number of the 

 arched carina? on the plate is greater. 



Zaspilothynnus trilobatus, sp. n. 



S . Clypeus rather prominent at the base, then almost vertically 

 depressed and broadly truncate at the ' apex, longitudinally 

 striated, punctured on the sides. Head closely punctured, finely 

 rugose on the front ; the interantennal prominence very broadly 

 rounded at the apex, connected with the base of the clypeus by 

 a short carina ; a fine longitudinal carina below the anterior 

 ocellus. Antenna? inserted a little further from each other than 

 from the eyes, scarcely as long as the thorax without the median 

 segment, and of almost even thickness throughout. Thorax, 

 median segment, and abdomen closely punctured, more finely on 

 the median segment and abdomen than on the thorax ; the 

 pronotum punctured-rugulose, slightly narrowed anteriorly, the 

 anterior margin strongly raised ; median segment rounded at 

 the sides, obliquely flattened posteriorly, with a shallow sulcus 

 from the base to the middle. Abdominal segments 2-5 mode- 

 rately constricted at the base, with a curved, slightly raised mark 

 on each side close to the apical margin ; the abdomen elongate, 

 tapering at the extremities. Sixth ventral segment with an 

 acute spine on each side at the apical angles ; seventh dorsal 

 segment produced from the base into a flattened plate, longi- 

 tudinally striated and truncate at the apex. Hypopygium with 

 a blunt tooth on each side at the basal angles, thence produced in 

 an elongate-triangular form and narrowly rounded at the apex, 

 transversely striated above, with an obscure longitudinal carina 

 and without an apical spine. The anterior coxa? are not concave, 

 and the groove between the first two ventral segments of the 

 abdomen is shallow, the second segment without a tubercle at 



