Two Subgenera of Ichneumons. 13 



It seems presumptuous to say that so able an author as the 

 one quoted should be in error ; but in this instance, from the ap- 

 parent disparity cf the sexes (still not greater than in some of the 

 fossorial Hymenoptera), such I feel confident to be the case. 



I propose the generic name of Macrocoleus as a combination of 

 the two; by doing so Coleocentrus would become a synonyme, 

 and the species would stand thus : — 



Macrocoleus excitator, $ and $ . . Syn. $ , Coleocentrus exci- 



tator (Grav.) 

 $, Macrus longiven- 

 tris (Grav.) 



Do. caligatus, 2 Syn. $ , Macrus ? 



(Grav.) 



which is a very similar $ ; and it may be inferred, that the $ 

 cannot be very different to longiventris, but Macrus filiventris 5 

 (abdomen angustissimum) appears to be very distinct. However, 

 1 think it likely that his Mi Croceicornis and Soleatus may have 

 females similar to M. excitator, and would naturally class under 

 the proposed genus ; these males Gravenhorst considers varieties 

 of one another. 



Mr. Curtis, in his Guide, has C. excitator indicated as British. 

 I have not seen an English specimen, but it is not improbable 

 that it may be so, as I took, in the same place, specimens of 

 Sirex Gigas and Spectrum. The wood consisted of rough deal 

 planks, and floors of the same. 



