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Show 6 DR. J. ANDERSON ON MAMMALS, REPTILES, well-marked new species of the genus Chalcides, of which I give a description and three figures, accompanied, for the sake of comparison, by two views of the head of its nearest ally, C. sepoides, Audouin. At the same place my collector also found a Viper distinctly referable to V. lebetina, but, at the same time, differing so much from the typical form, in some of the details of its structure, that I have had no other course left me but to describe it as a variety. MAMMALIA. Order CHIROPTERA. Family I. RHINOLOPHID-E. Genus RHINOLOPHUS, Geoffroy. 1. RHINOLOPHUS EURYALE, Blasius; Lataste, Etude de la Faune des Vertebres de Barbarie, 1885, p. 65. 1 <$, cave at Hammam Meskoutine, Province of Constantine. Family II. VESPERTILIONID^E. Genus PLECOTUS, Geoffroy. 2. PLECOTUS AURITUS, Linnaeus ; Lataste, Etude de la Faune des Vertebre's de Barbarie, 1885, p. 66. 2 6 & 14 $ , Duirat, Tunisia. Beyond M. Loche's statement1 that he saw a specimen of this Bat in the hands of a child at Blidah, I am not aware of any other notice of its occurrence in Algeria, and this is the first time it has been reported from Tunisia. The foregoing specimens, instead of being light brown, are pale ashy on the upper surface, the light colour generally distinctive of this Bat in desert regions. Genus VESPERUGO, Keys. & Bias. 3. VESPERUGO KUHLI, Natterer; Lataste, Etude de la Faune des Vertebres de Barbarie, 1885, p. 70; id. Cat. Crit. des Mammif. Apelagiques Sauvages de la Tunisie, 1887, p. 2. 1 <J & 1 $2, Duirat, Tunisia. 1 Cat. des Mammif. et des Oiseaux observes en Algerie, 1858, sp. 43. 2 The wing and interfemoral membranes of one of these Bats are torn and shrivelled up in places along the margins to such an extent that the flight of the animal must have been materially affected by it, Here and there over the surfaces of the membranes, and elsewhere on the body, there are dense colonies of a minute white Acarus, and it seems probable that the irritation produced by them had set up inflammation resulting in the partial destruction of the membranes, which also, when held against the light, were seen to be covered with small black spots, doubtless old inflamed areas due to the same cause. Mr. A. Michael kindly undertook to determine the nature of these Aeari. The following are his remarks :- " The Acari submitted to m e belong to two species only, and are all immature. " The first is a single specimen of the nymph of one of the Ixodidas, and |