446 Dr. Franz Leuthner on JEgognathus. 



mandibularis and Lessonii from Chili) ; with extremely 

 fine pubescence. Tibiae of the anterior pair of legs 

 with four unequal teeth on the apical half of the outer 

 edge. 



Measurements, $ : — Total, 30 mm. ; head, 4*5 long, 

 9*5 broad ; mandibles, 9*5 ; prothorax, 5*5 by 10 ; 

 elytra, 12 by 9. 



2 . Unknown. 



Hah. Peru (Chanchamayo). Collected by Mr. Tham. 

 British Museum. 



I have much pleasure in dedicating this very in- 

 teresting species to my friend Mr. C. 0. Waterhouse, 

 the well-known entomologist, as a slight acknowledgment 

 of the great assistance which I have constantly received 

 from him while occupied in studying the collections of 

 Lucanida in the British Museum. 



Although this insect resembles Mgus in its general 

 appearance, and especially in the shape of the mandibles, 

 yet it cannot be properly referred to Mgas, or to any 

 other allied genus ; and I have therefore found myself 

 compelled to establish a new genus for its reception. It 

 is intermediate in character between Mgus and Alcimus, 

 and likewise exhibits some relationship with the South 

 American genus Sclerostomies. 



The Mgidce, have their metropolis in the Sunda Islands, 

 and extend northwards to Malacca on the one side and 

 to China and Japan on the other, and they have like- 

 wise been received from Celebes, New Guinea, and the 

 Fiji Islands ; while Alcimus occurs in the Navigators 

 Islands also, thus bridging over part of the distance 

 towards the west coast of South America. 



If we consider the relationship existing between the 

 Australian and New Zealand fauna and that of South 

 America,* we cannot be surprised if we meet with fresh 

 proofs of affinity between Indo-Australian and American 

 forms as often as collections are received from previously 

 unexplored countries or localities. 



* This is shown by the Venezuelan genus Splienognathus, which 

 is most nearly allied to the Australian genus Cacostomus, and by 

 the South American genera Chiasognathus and Streptocerus, which 

 clearly resemble the Australian genus Lamprima; and by the 

 affinity of the Brazilian genus Hexaphyllum, Gray, to the Aus- 

 tralian genus Syndesus ; as well as by the occurrence of Marsupials 

 and Cassowaries in America and Australia. 



