Male Genital Armature of the Dermaptera. Part III. 13 



Skalistes luguhris Dohrn. 



The metaparameres are more or less crescent-shaped, the virga 

 very short, entering the vesicle without angle ; the vesicle is feebly 

 dilated, and protracted by a broad, rounded chitinous lobe. It thus 

 approaches Boru lineare rather than Forficula in form (PI. Ill, lig. 1). 



Doru lineare Esch. 



Metaparameres broad and crescent-shaped, narrovv^ed towards 

 the tips ; virga scarcely longer than the vesicle, which it enters 

 without angle ; there is a pair of narrow chitin-plates in the prse- 

 putial sac, and a small chitin-lobe in the vesicle (PI. Ill, fig. 2). 



Zacher remarks that in this species the metaparameres depart 

 somewhat from the Forficuline type ; but I am inclined to think 

 that his specimen should be referred to the following species, as 

 a comparison of the figures shows at once that in D. lineare the 

 metaparameres are much broader and less acute than figured by 

 him. 



Doru luteipenne Serv. 



My figure agrees well enough with fig. 14 of Zacher, which he 

 attributes to D. lineare. The metaparameres are distinctly convex 

 externally, but not so truly crescent-shaped as in B. lineai'e. 



The virga is of medium length, and the lower part has a long 

 narrow chitin-plate ; the virga enters the vesicle almost without 

 angle, and the latter has a small round chitin-lobe (PI. III. fig. 3). 



In the apical narrowing and generally semilunar shape of the 

 metaparameres, the Neotropical species, with Skalistes luguhris, 

 offer a common departure from the true Forficuline type. 



Doru himaculatum Beauv. 



This species, although known for a century, is rare in collections. 

 The metaparameres depart less from the Forficuline type than in 

 the three preceding species ; they are very long, almost parallel- 

 sided, straight, and scarcely narrowed at the apex. The virga is 

 short, but doubly elbowed at the junction with the vesicle, which 

 has a very small chitin-lobe. Except in its length, the virga 

 rather resembles that of Forficula smyrnensis (v. fig. 17 of Zacher), 

 while the metaparameres recall rather those of F. lurida (PI III 

 fig. 4). 



If we judged from the genitalia alone, this species would be 

 placed in Forficula rather than in Doru. 



