14 Transactions of the Society. 



Elaunon hipartitns Kirby. 



In the long, straight, parallel-sided metaparanieres, and dilated 

 propara meres, this species agrees with Forficula. The vii-ga is 

 moderately long, a good deal longer than the metaparameres ; it is 

 elbowed at the junction with the vesicle, which has no chitin-lobe. 

 There is nothing in the genitalia to warrant the separation of this 

 species from Forficula (PI. Ill, fig. 5). 



Hypurgus humeralis Kirby. 



Another typical Forficuline genital armature ; metaparameres 

 gently curved, and of equal breadth through their length ; virga 

 nearly two and a half times as long as the metaparameres, elbowed 

 at the junction with the vesicle, which has a rounded chitin-plate 

 (PI. Ill, fig. 6). 



Apterygida alhipennis Meg. 



The genitalia do not differ from those of Forficula. Metapara- 

 meres straight ; virga about as long as the metaparameres, entering 

 the vesicle without angle, the latter with small chitin-plate (PI. Ill, 

 fig. 7). 



Apterygida cavalli Bor. 



Only differs from the preceding in the short vii'ga, scarcely as 

 long as the metaparameres, entering the vesicle almost without 

 angle, the latter with a horseshoe-shaped chitin-plate (PL III, fig. 8). 



Forficula Linn. 



The metaparameres are nearly or quite straight, and of equal 

 breadth throughout their length, rounded at the tips. The virga 

 is of various lengths, and enters the vesicle at various angles, both 

 of which features seem to offer useful specific characters, as 

 Zacher has suggested. The vesicle usually has a small chitin-lobe ; 

 possibly this is always present, as it is easily overlooked. 



The virga is shorter than the metaparameres in F. rodziankoi 

 Sem. and F. lucasi Dohrn (fide Zacher), F. auricularia L. (PI. Ill, 

 fig. 13), F. senegalensis Serv. (PI. Ill, fig. 15), and F. lurida Pisch. 

 (PI. Ill, fig. 11), and in all this group enters the vesicle almost 

 wdthout angle. In F. auricularia and F. senegalensis the metapara- 

 meres are rather convex externally. In the next group the virga 

 is about one and a quarter to one and a half times as long as the 

 metaparameres, and enters the vesicle at an obtuse angle ; to this 



