STUDIES IN THE FOSSORIAL WASPS. 705 



the eyes as from each othei\ Pronotum nearly as broad as the 

 head, widely emarginate anteriorly ; scutellum with a large 

 triangular rugose area from the base to the narrowly truncated 

 apex, the sides smooth and opaque. Postscutelluni and median 

 segment smooth and opaque, a few large punctures on the middle 

 of the postscutelluni ; median segment raised towards the median 

 line, with a narrow margined median groove, the posterior trunca- 

 tion of the segment coarsely but shallowly punctured, the sides of 

 the segment closely obliquely striated. Abdomen shining, finely 

 and very sparsely punctured, the punctures larger on the ventral 

 than on the dorsal surface, and rather closer at the apex of the 

 segments than at the base ; the apical dorsal segment broadly 

 rounded, and longitudinally punctured-striate. Second abscissa 

 of the radius a little shorter than the third ; first recurrent 

 nervure received beyond the middle of the second cubital cell, 

 second at two-thirds from the base of the third cubital cell. 

 Radial cell detached from the costa for about half its length. 



Hah. British liast Africa, Makindu, 3300 ft. {8. A.^N'eave); 

 April 5-7, 1911 (.4. E: R. C). 



This fine speeies does not seeih to be very nearly allied to any 

 other, being well distinguished from the rvficeps group by the 

 very coarse sculptUl-e of the head and thorax. The basal joint of 

 the posterior tarsi is furnished with a closely-set comb of small 

 spines beneath. 



The description of Cosila donaldsoni Fox corresponds rather 

 closely to this species, but the clypeus is tridentate on the apical 

 margin, not rounded, with indistinct teeth as in the present 

 species, and I think Fox was too careful a woi'ker to have con-- 

 fused the genera. 



Elis (Mesa) auhiflua, sp. n-. 



5 . Nigra ; mandibulis basi, 2}ronoio, mesonoto scuielloque rufo- 

 ferrugineis ; alls inficscatis. 

 Lovg. 12 TiiTn. 



5 . Head and pronotum closely and rather strongly punctured ; 

 mesonotum and scutellum much more sparsely punctured, smooth 

 in the middle ; pleurae coarsely punctured ; median segment finely 

 and closely punctured, the median groove harrow and shallow, 

 margined by low carinse, the posterior truncation more shallowly 

 punctured. Abdomen rather closely and not very finely punctured, 

 the apical segment closely longitudinally striated-. Sides of the 

 median segment obliquely striated. , Clypeus transverse at the 

 apex. Eyes vel-y feebly and widely emarginate on the inner 

 margin ; posterior ocelli f ul'-ther from the eyes than from each 

 other. Head more than half as broad again as long, broader than 

 the thorax. Pronotum short, not as long in the middle as the 

 scutellum, the anterior margin stiaight, the posterior margin 

 "widely arched. Pubescence sparse and whitish, calcaria whitish. 

 Radial cell only separated from the costa at the apex, which is 

 subtruncate ; first abscissa of the I'adius as Ion"- as the second. 



