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Show 24 MR. R. I. POCOCK ON MYRIOPODA AND [Jan. 5, A pair taken in copula at Biskra had the following measurements :- 3 , snout to vent 124 millim.; $ , 96. 4. BUFO VULGARIS, Laurenti; Boulenger, loc. cit. p. 159. 1 specimen, Algiers. Family III. HYLID,E. Genus HYLA, Laurenti. 5. HYLA ARBOREA, Linnaeus ; Boulenger, loc. cit. p. 159. Var. MERIDIONALIS, Boettger. 1 2 » Tlemcen ; 1 3 & 1 $, Hammam Meskoutine, Province of Constantine. Family IV. DISCOGLOSSID^E. Genus DISCOGLOSSUS, Otth. 6. DISCOGLOSSUS PICTUS, Otth; Boulenger, loc. cit. p. 160. 2 3, Tlemcen, Province of Oran ; 6, Hammam R'irha, Province of Algiers ; 2, Algiers. The condition of the tympanum in these specimens varies considerably, 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 the head, twice nat. size. Fig. 3. Side view of the head, twice nat. size. Fig. 4. View of the upper surface of the head of C. sepoides, 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, Linnaeus, var. deserti, nat. size. Fig. 7. Side view of the head of the same, nat. size. 2. O n the Myriopoda and Arachnida collected by Dr. Anderson in Algeria and Tunisia. By R. I. POCOCK. [Received January 11, 1892.] The Myriopoda collected by Dr. Anderson during his stay in Algeria and Tunisia in the winter of 1890 and 1891 are referable 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 Palaearctic region. The rest of the species are principally remarkable for the light |