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Show 3G4 MR. R. I. rOCOCK ON TIIE [Apr. 21, The Austro-Malayan Islands, which were referred by Wallace to the Australian Region, belong, according to their Arachnid fauna, to the Oriental Region-Wallace's line being practically non-existent. Sonoran Region. Dipluridse. Diplurinae.-Bracliythele : California, Texas, etc. Macrothelinae.-Evagrus : Idaho. Mecicobothriidae.-Hexura : Oregon and Washington State. Brachybothriidse.-Brachybothrium : From Texas and Virginia to British Columbia. Atypoides : California. Atypidse.-Atypus : Eastern States, from Wisconsin to Florida. Cyrtaucheniidae.-Amblyocarenum, Aptosticlius, and Actinoxia : California. Myrmeciapliila : Carolina, Virginia. Ctenizidse.-Pachylomerus : Carolina, Alabama, &c., Mexico. Bothriocyrtum : California, Utah, Texas, Mexico. Halonoproctidae.-Cyclocosmia : California, Alabama. Chorizops : Mexico. Aviculariidae. Aviculariinae.-Aphonopelma ; Texas, Arizona, California. And perhaps others. Out of the above-given list of 15 genera no fewer than 10 are peculiar to the Region, all, that is to say, with the exception of Atypus, Brachythele, Amblyocarenum, and Pachylomerus, which are also present in the Mediterranean Region, and Evagrus, which is met with in the Neotropical and Ethiopian Regions. This Region, including the Mexican plateau and the Southern States of the Union, extends northwards to the northern limits of the Mygalomorphae, or at least to those of the Scorpiones and Solifuga? \ Neotropical Region. (Central America south of the Mexican plateau, West Indies, Bahamas, and South America.) The principal genera are :- Dipluridse. « Diplurinae.-Diplura: S. America. Uruchus : Ecuador. Trechona, Melodeus, and Harmonicon : Brazil. Fujius: Central and South America. Trissothele : Chili. Ljci-nus: Argentine. Macrothelinse.-Ischnothele : Central and South America, W. Indies. Evagrus : Central America. Paratropidse.-Paratropis : Ecuador, Amazons. Anisaspoides : Amazons. Anisaspis : W. Indies. Mecicobothriidae.-Mecicobothrium : Argentine. 1 Compare also in this connection the distribution on the coast of Limulus poh/- pJicnnis, from ('ape Cod to the Gulf of Mexico. |