^MYg61899 



ON THE GENUS JONTHOCERUS. 185 



NOTE XXVI. 



ON THE SPECIES OF THE GENUS 



JONTHOCERUS LAC. AND DESCRIPTION OF A NEW 



SPECIES FROM ZANZIBAR 



B? 



Dr. ANGELO SENNA, 



Assistent in the R. Museum at Florence. 



Some time ago I have had occasion , in speaking of the 

 genus Cerobates Schh. ^), to note the logical position in 

 the Brenthids arrangement of the genus Jonthocerus Lac. 

 after the suppression of the subfamily Ephebocerinae lately 

 proposed by Prof. Sharp. This position is among the Stere- 

 oderminae near Cerobates to which the genus Jonthocerus 

 is allied. In this subfamily, Jonthocerus represents the 

 South American genus Ephebocerus Schh. of the Tracheli- 

 zinae. 



The characteristic of all the species of this genus is, in 

 the males, the remarkable development of the eyes oc- 

 cupying often the greater part of the head, and the long 

 and slender antennae clothed with delicate hairs. The females 

 have the eyes smaller and normal, the antennae shorter 

 and more robust; it is not easy to distinguish them from 

 Cerobates. 



The genus has a wide geographical distribution, its species 

 inhabiting Ceylon, Upper Burma, Penang, Singapore, Saigon, 

 Japan, Borneo, Sumatra, the Andaman andMentawei Islands, 

 Java, New Guinea, Australia, finally Zanzibar and Cameroon. 



1) Notes Leyden Museum, Vol. XVII, p. 209, 1896. 



Notes from tlie Leyden Museuna , Vol. XX. 



12** 



