314 



Memoirs of the Indian Museum. 



[Vol.. Ill, 



Text-figure 7. 



Diagram illustrating the evolution of the different types of asymmetry found in the Aceraiinae and 

 Gnaphalocneminae, as far as this can be done by reference to known genera, all of which are recent ; and 

 illustrating the geographical distribution of these genera. The only known exceptions to the distribution 

 as shown here are: — (i) a species of Episphenoides which lives in New Guinea instead of Australia; (2) 

 one or two species of Gonatas which occur in the Sunda Islands; (3) a species of Gnaphalocnemis 

 which has been recorded from Amboina; and (4) the genus Plesthenus, whose anomalous distribution (in 

 Australia and Celebes) calls for further study. The genus Kanpioloides is in some ways intermediate 

 between the Australian genera and Ceiej us- Anal aches from New Guinea, in which position it is placed 

 here. The head is, however, less perfectly symmetrical than in some species of the latter pair of genera ; 

 and its metasternum suggests the possibility of a closer relationship with Protomocoelns than is here indi- 

 cated. The particular structures whose various modifications the diagram is designed to illustrate are 

 shown by thickened lines. The figure of Plesthenus is from Kaup ; those of Pelopides and Tatius are 

 from Kuwert; that of Aurelius is partly from Kuwert, partly from memory; and that of the sym- 

 metrical species of Cetejus-Analaches entirely from memory. 



