128 REVISION OF THE THYNNIDiE OF AUSTRALIA, II., 



on each side and an interrupted band on segments 2-5 beneath 

 pale yellow; legs, except coxae and trochanters pale ferruginous. 

 Wings hyaline, nervures black, stigma testaceous. Length 9 mm. 

 Hab. — N.W. Australia (French). 



50. T. (Aeolothynnus) colokatus, n.sp. 



<J. Clypeus short, rather broadly truncate at apex and finely 

 punctured. Head finely and closely punctured, interantennal 

 prominence broadly V-shaped. Thorax finely and closely 

 punctured ; pronotum with anterior margin raised, obliquely 

 truncate in middle below the raised margin, causing the 

 segment to appear broadly emarginate anteriorly. Median 

 segment much broader than long, rounded, very closely and 

 finely punctured, with a smooth mark on each side at base. 

 Abdomen elongate, finely and shallowly punctured; segments 2-5 

 with an impressed transverse line near base, and apical margin 

 very narrowly depressed. Hypopygium ending in three acute 

 spines, the central spine much the longest. Black; mandibles, 

 clypeus, an oblique line on each side between antennae, pronotum 

 with a small black spot on middle and a large one on each side, 

 a quadrate spot on mesonotum, tegulae, a large spot on meso- 

 pleurse beneath anterior wing and another smaller one behind it, 

 middle of scutellum and a spot at each of anterior angles, a 

 longitudinal mark from apex of median segment reaching beyond 

 middle, with a large spot on each side at apex, a narrowly inter- 

 rupted transverse band near apex of the six basal abdominal seg- 

 ments above and a spot at apex of coxae bright yellow; legs, 

 except coxae and trochanters pale ferruginous marked with yellow. 

 Wings hyaline, nervures fuscous. Length 9-10 mm. 



£. Head small, smooth and shining, rather broader anteriorly 

 than long, much narrowed posteriorly; with a deep and large 

 excavation on each side from eye to base of antennae, reaching 

 much higher than eye. Thorax very narrow; pronotum much 

 longer than broad, with a strong, longitudinal, median carina. 

 Median segment very short, obliquely truncate from just behind 

 mesonotum. Abdomen smooth, much broader than thorax;. 



