24 MR. R. I. POCOCK ON MYRIOPODA AND [Jail. 5, 



A pair taken in copula at Biskra had the following measure- 

 ments : — c? , snout to vent 124 millim. ; $ , 96. 



4. BuFO VULGARIS, Laurenti ; Boulenger, loc. cit. p. 159. 

 1 sjjecimen, Algiers. 



Family III. Hylid^. 

 Genus Hyla, Laurenti. 



5. Hyla arborea, Linnseus ; Boulenger, loc. cit. p. 159. 

 A'ar. MERiDiONALis, Boettger. 



1 5 , Tlem9en ; 1 cJ & 1 $ ) Hammam Meskoutine, Province of 

 Constautine. 



Family IV. Discoglossid^. 



Genus Discoglossus, Otth. 



6. Discoglossus pictus, Otth; Boulenger, loc. cit. p. 160. 



2 S , Tlem9en, Province of Oran ; 6, Hammam R'irha, Province 

 of Algiers ; 2, Algiers. 



The condition of the tympanum in these specimens varies con- 

 siderably, being distinct in some and wholly invisible in others. It 

 thus supports M. Lataste's opinion, with which Mr. Boulenger 

 agrees, that there is only one species of Discoglossus. 



DESCRIPTION OF PLATE I. 



Fig. 1. Chalcides boulengeri, nat. size. 



Fig. 2. View of the upper surface of tbe head, twice nat. size. 



Fig. 3. Side view of the head, twice nat. size. 



Fig. 4. View of tlie upper surface of the head of C. scpoides, Audouin, twice 



nat. size. 

 Fig. 5. Side view of the head of the same species, twice nat. size. 

 Fig. 6. Upper surface of the head of Vipera lebetina, Linnaus, var. deserti, 



nat. size. 

 Fig. 7. Side view of the head of the same, nat. size. 



2. On the Myriopoda and Arachiiida collected by 

 Dr. Anderson in Algeria and Tunisia. By R. I. Pocock. 



[Eeceived January 11, 1892.] 



The Myriopoda collected by Dr. Anderson during his stay in 

 Algeria and Tunisia in the winter of 1890 and 1891 are refer- 

 able to 21 species, one of which appears to be new. This, which 

 I call Brachydesmus insculptus, seems to be very nearly related to 

 a species that was described two years ago by Dr. Latzel from the 

 Azores. This fact is of interest, inasmuch as it affords another link to 

 the chain of affinity between the fauna of these islands and that of 

 the Mediterranean district of the Palsearctic region. 



Tlie rest of the species are principally remarkable for the light 



