122 REVISION OF THE THYNNIDjE OF AUSTRALIA, II., 



truncate at apex, the angles a little produced, but not forming 

 spines, apical spine blunt. Black; mandibles at base, extreme 

 apex of clypeus and of interantennal carina?, anterior margin of 

 pronotum narrowly interrupted, a spot on scutellum, post- 

 scutellum and a large spot on each side of abdominal segments 

 2-6 pale yellow; a spot on each side of vertex, tegulse, a large 

 spot at base of second abdominal segment and legs, except coxse 

 and trochanters ferruginous. Wings hyaline, nervures black. 

 Length 8 mm. 



Hob. — Western Australia (Du Boulay). Type in Brit. Mus. 



41. T. (Aeolothynnus) decoratus Sm. 

 Thynnus decoratus Sm., Descr. n.sp. Hym. p. 159, n.5, 1879((J)* 

 (J. Clypeus short and broad, with a small tubercle in centre, 

 narrowly truncate at apex. Head and thorax shining, finely 

 and closely punctured; interantennal carina broadly V-shaped, 

 interrupted at apex by a smooth longitudinal line. Anterior 

 margin of pronotum raised and slightly emarginate; scutellum 

 rather long and truncate at apex. Median segment very deli- 

 cately transversely striated, almost smooth at base. Abdomen 

 flattened, fusiform, ver} r delicately punctured and shining; first 

 segment with a sulcus from base reaching nearly to apex; second 

 segment depressed at base; segments 2-5 depressed on apical 

 margin, with a raised curved mark narrowly emarginate poste- 

 riorly before apex. Hypopygium ending in three spines, the 

 central spines strong, those at the apical angles very short. 

 Hah.— Adelaide, S.A. (Smith). 



42. T. (Aeolothynnus) sodalis, n.sp. 



g. Clypeus very narrowly truncate at apex, very finely punc- 

 tured. Head and thorax shining, rather closely punctured, 

 interantennal prominence bilobed, the lobes long and separated 

 by a narrow frontal sulcus; pronotum short, anterior margin 

 raised, broadly but slightly emarginate; scutellum rather broadly 

 subtruncate at apex. Median segment shining, very delicately 

 transversely striated. Abdomen flattened, fusiform, very 



