The above words are under the head of ‘_Les Crotaliens_,’ a name retained, he had already explained why. ‘_Les solenoglyphes qui ont les narines doubles en apparence seront pour nous les Crotaliens quoique cette dénomination puisse, à tort, porter à croire que ces espèces font du bruit avec leur queue: elle indique seulement leur rapports avec les crotales établis d’après la présence des fausses narines ou fossettes dont nous venons de parler. On nomme quelquefois ces Ophidiens Bothrops._’[108] ... ‘_Comme ce caractère conviendrait à tous les Crotaliens parcequ’ils ont tous des fossettes dites lacrymales, ce nom (Bothrops) deviant par conséquent trop général._’[109] In retaining _Bothrops_ as a generic distinction, a large number of non-venomous and constricting serpents must have been included, which probably induced Wagler’s opposers to say of him that he ‘created a system in which the venomous and non-venomous were huddled together pell mell.’ Thus we see that on account of the nasal fosse the Indian crotaline snakes could not be true vipers; they could not be exclusively _Bothrophidæ_, for the reasons given above, and they certainly are not rattlesnakes; but for want of a better name they are ‘_Crotalidæ_,’ as they have (minus the rattle) more features in common with rattlesnakes than with any others. In the slough of a rattlesnake you may see the form of this pit. It is lined with scales, and reversed in sloughing, perfectly shaped as a tiny glove finger. When Dr. J. E. Gray, F.R.S., etc., edited a short-lived little magazine in 1831 called the _Zoological Miscellany_, the whole of the known _Crotalidæ_ consisted of ten genera and thirty species, of which sixteen species belonged to Asia and its adjacent islands, one to South Africa, and the rest to America. When he published his catalogue of snakes belonging to the British Museum in 1849, he enumerated eleven genera and thirty-seven species. Wallace, 1876, gives eleven genera and forty species, the eastern examples of which belong to India, Siam, Java, Borneo, Tartary, Thibet, Japan, and Formosa. Still more recently some belonging to the Western States of America have, I believe, been added by Cope or Coues, the latter informing us that up to the date of his paper, 1878, eighteen species and upwards of the rattlesnake proper had been described in the United States, nearly all in the west and south-west. So, as those vast deserts are being explored, new species are continually discovered.