A DISCUSSION ON BEEATHING 



141 



of the trunk and the epimera and by two ducts under the 

 insertion of the pleon. In Ethusa the case is the same. 



FIG. 11 Ranina scabra (Fabricius), a male specimen, with separate figure of the pleon 



[de Haan]. 



In Calappa and Matuta the hinder ducts are not below but 

 close to the pleon over the first joints of the fifth pair of 



