1910.] F0SS0RIAL WASPS OF AUSTRALIA. 303 



vertex, mesonotum except a quadrate spot near the middle, meso- 

 pleura? except a spot beneath the anterior wings, mesosternum 

 and the two apical abdominal segments, black. Wings hyaline, 

 tinged with yellow, the radial cell clouded with fuscous ; nervures 

 black, except at the base ; stigma and costa ferruginous. 



Length 18 mm., exp. 28 mm. 



Hab. Hermannsburg, Central Australia (H. J. Hillier). 



This comes nearest to the genus Zaspilothynnus Ashm., but is 

 a smaller and slenderer insect than leachiellus Westw. 



Zaspilothynnus gilesi, sp. n. (Plate XXXI. figs. 12 J , 13 5 .) 



<$ . Clypeus large, broadly truncate at the apex, the labrum 

 projecting beyond the clypeus and narrowly truncate at the apex ; 

 the clypeus punctured at the extreme base, finely longitudinally 

 striated at the apex, the stria? arching narrowly above the middle. 

 Head closely punctured-rugose ; the interantennal prominence 

 broadly rounded at the apex and connected with the base of the 

 clypeus by a very short carina. Antenna? as long as the thorax 

 and median segment combined, of almost even thickness through- 

 out. A few long hairs on the outer margin of the maxilla?. 

 Thorax finely and closely punctured ; the middle of the pronotum 

 finely rugulose, the anterior margin slightly raised ; the longi- 

 tudinal furrows on the mesonotum deeply marked ; scutellum 

 large and slightly convex. Median segment obliquely truncate 

 from just behind the postscutellum, the surface of the truncation 

 shining and finely rugulose, the sides of the segment sparsely 

 clothed with long whitish pubescence. Abdomen finely and 

 closely punctured, a little longer than the head and thorax 

 combined ; the basal segment obliquely truncate anteriorly, 

 narrower at the base than at the apex, as broad at the apex as 

 the second segment ; the apical dorsal segment produced into a 

 flattened plate, which is longitudinally striated and rounded at 

 the apex. The groove between the two ventral segments is 

 moderately broad, and there is a small blunt tubercle at the base 

 of the second segment. Sixth ventral segment with a small 

 spine on each side at the apical angles. Hypopygium with a 

 rounded lobe on each side at the base, thence rather broadly 

 produced to the base of the apical spine, obliquely striated above, 

 punctured beneath. 



Black ; mandibles, clypeus, the inner margin of the eyes as 

 high as the base of the antenna?, the outer margin narrowly to 

 the summit, the anterior margin of the pronotum interrupted in 

 the middle, and a spot usually rather small on each side of dorsal 

 abdominal segments 1-5, yellow. Wings very pale fusco-hyaline, 

 nervures black. 



Length 24-27 mm. 



Var. a. A yellow spot on each side of the sixth dorsal segment. 



Yar. b. Femora ferruginous, abdominal spots enlarged. 



2 ■ Clypeus without a carina. Head moderately convex, 

 shining, sparsely and irregularly punctured, nearly twice as broad 



