602 Mr. R. E. Turner oi^ Fossorial Hymenoptera. 



white line ; white underneath. Wings white ; the margins 

 fuscous grey, darkest on veins. Fore wings : a rather broad 

 fuscous-grey band from costa across discocellular to tornus ; 

 veins fuscous grey except on large postmedial white area. 

 Hind wings white suffused with fuscous brown between 

 veins 2 and 4, though streaked with white near outer 

 margin ; the veins fuscous grey. 



Expanse 39 mm. 



Hab. Sixola, Juan Vinas. 



Near G. seviiplecta^ Warr., but the transverse band on 

 fore wings differently placed. 



LXVII. — Notes on Fossorial Hymenoptera, — V. 

 By Rowland E. Turner, F.Z.S., F.E.S. 



Further Notes on the Thynnidae and Scoliidse. 



Where not otherAvise mentioned, the types of the species 

 described here are in the British Museum, several having 

 been received from the African Entomological Research 

 Commission. In more than one case 1 have been obliged to 

 speak rather severely of the work of Mr. Cameron ; I regret 

 to do so, but as he is still publishing I consider it necessary. 

 But in describing species of Scolia, especially Dielis, from 

 the male sex he is by no means alone : this should never be 

 attempted except from a large series and by comparison of 

 the genitalia, which usually show good specific distinctions ; 

 colour is not usually reliable, and even when constant 

 locally may be different in another locality without corre- 

 sponding differences in the female. Descriptions of new 

 species in this genus when taken from the male alone are 

 seldom anything but a hindrance to other workers. Cameron, 

 in speaking of the African species of Plesia in Sjostedt^s 

 'Zool. Kilimandjaro-lNIeru Expedition,^ states that they are 

 much in need of revision. He is quite right, but it is largely 

 his own work on the group that renders such a revision 

 difficult or almost impossible for other workers. 



Family Thynnidae. 



Subfamily Rmagigasterinm. 



Rhagigaster latisulcatus, sp. n. 



5 . Nigra, nitida, sparse punctata ; capite subquadrato, sulco lato, 



