10 Budde-Lund. 



two specimens at Khartum under decaying leaves, and in the 

 month of May five specimens at Cairo under stones (Mus. Stockholm). 



The genus Periscyphis to which the two above quoted spe- 

 cies belong is instituted by Gerstaecker in the }^ear 1873 x . He 

 refers it in his paper in the Fam. Oniscidce to the Tribus Arma- 

 dillini, and describes the species P. trivialis from East-Africa. I 

 myself have also placed the two species near Armadillo. Now 

 I am not sure of the justness of this opinion but I cannot here 

 give reason for an alteration. 



The species I later have brought in this genus 2 are not all 

 rightly placed here, some seem to be more akin to the genus 

 Synarmadillo Dollp. 



I give below the characters over the genus Periscyphis, as 

 I have now restricted it, and in the tabula illustrations over the 

 most important details. 



Periscyphis. 



Antennarum flagellum articulo priore altero longiore. 



Oculi magni; ocelli numerosi, c. 25 — 30. 



Mandibularum lamina interior penicillis duobus in mandi- 

 bula dextra, penicillis tribus in mandibula sinistra. Seta inferior 

 radice longo, solido, inferiore, supra ramis et setulis numerosi* 

 instructo. 



Maxilla? primi paris lamina exterior in apice dentibus 9 ; 

 lamina interior post spina apicali nulla, penicillo superiore quam 

 inferiore breviore. 



Maxillipedum articulus labialis perlatus; mala brevis, spina 

 longa, aculeis nullis vel perparvis; palpus angustus, articulo 3. 

 multis partibus longiore quam latiore, spina apicali singula longa 

 instructo. 



Epistoma linea superiore in medio saepissime deleta a fronte 

 discretum. Foramina antennarum mediocra, tubercula antennaria 

 parva, ssepe subdeleta. Clypeus brevis, subfornicatus, in lateribus 

 lobatus. Pleurae capitis concretae; linea marginalis verticalis utrin- 

 que fere ad marginem frontalem producta. 



1 Die Gliederthier-Fauna des Sansibar-Gebietes, nach dem Material dm 

 v. d. DECKEN'schen Expedition. Leipzig 1873. 



2 G. Budde-Lund: Die Land-Isopoden Ost-Afrikas in Deutsch Ost- 

 Afrika IV. 



