Hymenoptera in the British Museum. 63 



Elis (Mesa) arnoldi, sp. n. 



$. Nigra; mandibulis dimidio apicali fusco-ferrugineis ; flagello 

 subtus fusco; pronoto propleurisque rufis; calcaribus albidis; 

 unguiculis pallide testaceis ; alis hyalinis, venis fuscis. 



Long. 9 mm. 



$. Clypeus subcarinate longitudinally in the middle, the apical 

 margin transverse and slightly depressed. Front closely and 

 strongly, vertex and pronotum less closely punctured; mesonotum 

 and scutellum sparsely punctured. Propleurae sparsely, meso- 

 pleurae very closely and strongly punctured; median segment 

 more finely and very closely punctured, with the usual shallow, 

 margined, longitudinal groove from the base, the sides of the segment 

 finely and closely striated. Abdomen rather closely and shallowly 

 punctured on the dorsal surface; the ventral surface more finely 

 and closely punctured at the base of the segments, the groove be- 

 tween the two basal ventral segments very deep as in other species 

 of the genus. Sixth dorsal segment closely punctured at the base, 

 the punctures towards the apex intermingled with fine longitudinal 

 striae, the apical margin broadly smooth and pale testaceous, broadly 

 rounded at the apex. Third abscissa of the radius twice as long as 

 the second, recurrent nervures received distmctly beyond the middle 

 of the second and third cubital cells. Basal joint of the hind tarsi 

 with a scopa of fine whitish hairs beneath. 



Hah. S. Rhodesia, Buluwayo {G. Arnold), March. 



In colour this species somewhat resembles Anthobosca 

 erythronota, Cam., but is generically distinct. The sculpture 

 of the sixth dorsal segment separates it from all other 

 African species of Elis, the segment being nearly always 

 striated; in E. permgueyi, Sauss., in which it is punctured, 

 the punctures are very coarse and sparse. 



Pterombrus williamsi, sp. n. 



cj. Niger; mandibulis ferrugineis; abdomine segmentis tertio 

 quartoque apice lateribusque, quinto, sexto septimoque omnino 

 rufo-ferrugineis ; alis hyalinis, venis nigris. 



Long. 7 mm. 



Q. Head shining, sparsely and rather finely punctured ; antennal 

 tubercles well defined, forming short longitudinal carinae. j\Ian- 

 dibles bidentate at the apex; labrum transverse, Avith an apical 

 fringe of hairs. Pronotum distinctly longer than the mesonotum, 

 the anterior margin distinctly raised, rather sparsely pimctured; 

 mesonotum rather more strongly punctured; scutellum as long as 



