Male Genital Armature of the Dermaptera. Part II. 531 



Fikst Group. — Titanolabides. 



In which the mesosternum usually, the metasternum always, 

 are produced posteriorly into a rounded or tongue-shaped lobe. 



1. Mesoternuni truncate ; (metaparameres elon- 

 gate and parallel- sided ; virga simple ; 

 apterous ; New Caledonian genus) . 1. Spondox Burr. 



1, 1. Mesoternum lobed posteriorly. 



2. Metaparamereg narrowed at tips ; virga 

 short ; (elytra rudimentary ; preputial 

 sack unarmed ; Indian genus) . . 2. Homoeolahis Bor. 



2, 2. Metaparameres parallel-sided, evenly 

 rounded at tips ; virga long. 



3. Metaparameres much shorter 

 than proparameres, gently ar- 

 cuate, emarginate at tips ; ap- 

 terous, preputial sack unarmed ; 

 Australian genus) . . .3. Titanolabis Burr. 



3, 3. Metaparameres about as long as 

 proparameres, straight, entire at 

 tips; (prseputial sack with chi- 

 tin -plates ; fully winged ; Papuan 

 genus) . . . . .4. Labidurodes Dubr. 



Genus Spondox Burr. 



Corpus apterum ; mesosternum postice truncatum, metasternum 

 lobatum ; metaparameres angusti recti, apice rotundati, seque longi 

 quam proparameres ; virga longa, subrecta. 



Totally apterous ; mesosternum posteriorly truncate ; meta- 

 sternum lobed ; metaparameres about as long as proparameres, 

 straight, narrow, rounded at the tip ; preputial sack with chitin- 

 plates ; virga long, almost straight. 



For the single species, S. sarasini Burr, from New Caledonia. 



Allied to Titanolabis, but differs in the truncate mesonotum, 

 and form of the genitalia, as shown in the table. 



Genus Homoeolabis Borelli. 



This genus was separated from Euborellia by the lobed meso- 

 and metasternal plates, thus approaching Titanolabis ; in general 

 appearance, sto.ut and contiguous forceps, it is also allied. The 

 form of the genitalia confirms the view of its relationship. The 



