1S£)9.] 229 



been described. Eadoszkowsky (Hor. Soc. Ent. Eoss., xix, pi. ix & x, 

 figs. 64 — 67) figures the terminal segments, &c., of several species, 

 but does not point out the peculiarities of the 8th ventral valve, 

 which seem to me to be most noteworthy ; he observes, however, that 

 the 8th dorsal valve bears no penicilli. 



In Mutilla the 8th dorsal has well marked penicilli, and the 8th 

 ventral is simple. 



In Myzine the 8th dorsal has well marked penicilli, and the 8th 

 ventral consists almost entirely of an upturned process, it having 

 scarcely any ventral surface. 



In Apterogyna the 8th dorsal is peculiar in being practically 

 membranous throughout and devoid of penicilli, and the 8th ventral 

 in having a shining brown cbitinous dorsal covering. The apical half of 

 its ventral surface is turned up at an obtuse angle to the basal ; from 

 the surface of this inclined plane an upturned process is emitted, the 

 upper edge of this inclined plane meets the apex of the dorsal surface 

 of the segment, which gradually declines back from the line of juncture 

 to the level of the base of the segment, a chamber of some kind 

 being evidently formed between the dorsal and ventral surfaces. The 

 dorsal surface is brown and very shining, and bears at each of its 

 apical corners an upturned, somewhat trapezoidal, projection with very 

 sharp angles ; these occupy exactly the same position as the penicilli 

 on the 8th dorsal of the allied genera, and at first I fully thought that 

 this dorsal surface could be removed, and would prove to be the real 

 dorsal valve of the somite ; there is, however, I feel sure no doubt 

 that the whole is ventral, as the armature is projected, above this 

 dorsal surface which we have been considering. I do not know any 

 other case in which the 8th ventral segment has a distinct dorsal 

 plate. Afterogyna seems to take a natural place between Mutilla and 

 Metlwca, Myzine, &c. Another strongly marked character in the male 

 of A. Olivieri, and less so but distinctly in A. pici, Andre, is the patch 

 of golden bristles on each side of the 6th ventral segment ; the 3rd 

 segment bears at the base a series of longitudinal costse like those at 

 the base of the 2nd segment of Odynerus ; these are especially visible 

 on the ventral surface. 



St. Ann's, Woking : 



September, 1899. 



