342 Mr. R. E. Turner on Fossovial Hymenoptera. 



of the head, the margins of the pronotura, very narrowly 

 interrupted in the middle on the anterior margin, the tegulae, 

 a quadrate spot on the mesonotum, a spot on the mesopleurse 

 beneath the anterior wings, a broad band emarginate ante- 

 riorly on the scutellum and a spot at each of the anterior 

 angles, the postscutellum, the median segment (except at the 

 base and on the sides), a transverse band on the six basal 

 dorsal segments of the abdomen, narrowly interrupted on 

 segments 3-5 and very broadly on the sixth segment, yellow. 

 "Wings hyaline, a faint fuscous cloud in the apical half of the 

 radial cell, nervures black, stigma ferruginous. Legs fuscous, 

 the femora beneath and a line on the tibise above yellow. 

 Length 10-12 mm. 



? . Head slightly convex, half as broad again as long, 

 rounded at the posterior angles, minutely and rather closely 

 punctured, with a well-marked frontal sulcus, the clypeus 

 subcarinate. Pronotum nearly twice as broad as long, the 

 sides parallel, the lateral margins slightly raised near the 

 posterior angles, finely and sparsely punctured. Scutellum 

 small, broadly rounded at the apex. Median segment short, 

 scarcely longer than the scutellum, almost smooth, broadened 

 from the base and obliquely truncate posteriorly, with a small 

 low tubercle in the middle at the base of the truncation. 

 Abdomen very sparsely and shallowly punctured ; the first 

 segment rather broadly depressed at the apex, the apical 

 margin very feebly raised ; second segment with four trans- 

 verse carinse, including the strongly raised apical margin, the 

 basal carina very low ; third and fourth segments narrowly 

 depressed at the apex, the raised portion bilobed at the apex. 

 Pygidium narrow, compressed and arched at the base, trun- 

 cate posteriorly, the surface of the truncation about half as 

 long again as broad, the dorsal plate very short and narrow, 

 the ventral plate with nearly parallel sides, rounded at the 

 apex. Ventral segments sparsely but not finely punctured, 

 the fifth segment more closely than the others. Tarsi slender, 

 the ungues bidentate. 



Testaceous brown ; the head ferruginous, luteous on the 

 sides and at the base of the mandibles, the median segment 

 and the fourth dorsal segment of the abdomen fuscous. 

 Fresh specimens are entirely pale castaneous. 

 Length 6-7 mm. 



Eah. Ceara [A. Duche), April and May. 3 (J, 3 ? . 

 Near Thynnus fastuosus, Sni., but that species, of which 

 only the male is known, is more strongly punctured and 

 rather more robust, though the clypeus and hypopygiura are 

 similar. 



