Male Genital Armature of the Dermaptera. Part II. 533 



1. Metaparameres narrow at base, broadest in the 



middle, acuminate at the tips ; (elytra 



rudimentary ; Neotropical genus) . . 1. Mandex g.n. 



1, 1. Metaparameres approximately parallel-sided, 



not acuminate. 



2. Virga indurated ; (winged or brachy- 



pterous ; Neotropical genus) . . 2. Psalis Serv. 

 2, 2. Virga not indurated, or absent. 



3. Pygidium fused with tenth tergite ; 



(apterous ; Ethiopian genus) . 3. Logicolabis Zacher. 

 3, 3. Pygidium not fused with tenth ter- 

 gite ; (apterous ; Palaeotropical 

 genus) ...... 4. Anisolabis Fieb. 



Genus Mandex g. n. 



Corpus apterum ; elytra rudimentaria ; metaparameres triplo 

 longiores quam latiores, sensim acuminati, basi dilatati. 



Apterous ; elytra present as lateral flaps; metaparameres more 

 than three times long as broad and acuminate, broad at base, 

 gradually narrowing towards the apex ; preputial sack armed with 

 teeth and chitin-plates. 



This genus is formed for Euborellia peruviana Borm. 



Unfortunately, I have only old and dry material, but the virga 

 seems to be short, straight and rather broad ; the preputial sack 

 has a strong chitinized armature, the details of which are obscure. 

 The metaparameres are long, broad at the base, and regularly 

 tapering to an acute point. 



M. peruvianus Borm., from Peru, is the only known species 

 (PI. X, fig. 4). 



Genus Psalis Serv. 



Zacher had very little material to work upon ; he states that 

 in P. americana the virga is gently sinuate and longer than the 

 metaparameres, which are acuminate. My figure shows that they 

 are rather blunt at the tip ; what is apparently the virga of Zacher 

 is distinctly seen in my figure. I am inclined to think it is a 

 mere chitin-plate. A similar structure is seen in the allied 

 " Carcinophora robusta " (= Psalis gagatina), where the meta- 

 parameres are rather more pointed, and a little broader. 



The smaller Neotropical species are probably all to be removed 

 to Spandex, and the Palaeotropical species fall into new genera 

 (PI. X, figs. 5 and 6). 



Genus logicolabis Zacher. 



In Logicolabis I am unable to detect the ' : S-formige Verdic- 

 kungsplatte," described and figured by Zacher. As in his figure, 

 both my specimens are in erection, and in the extruded preputial 



