311 

 Leech and Chandler: Coleoptera 



wm 





Metasternum 



' Coxal processes 

 k 



Fig. 13:10. Dytiscidae. a, Cybister sp., front tarsus of male; b, Agabus sp., trochanter and 

 femur of hind leg of adult, showing linear group of ciliae; c, llybius sp., lateral view of serrated 

 ovipositor of female; d, Agabus sp., ventral surface of adult; e, Agabus sp., ventral surface of 

 adult; f, llybius sp., last two segments and tarsal claws of hind tarsus; g, Hydrotrupes palpalis, 

 labial palp of adult; b, Agabus sp., labial palp of adult; /, Carrhydrus crassipes, labial palp of 

 adult; /, Oeronectes sp., head of larva to show notch in frontal projection; k, Copelatus sp., 

 underside of adult to show coxal lines; /, Oeronectes sp., tip of abdomen and a cercus to show 

 hairs; m, Hydroporus sp., larva, side view of head to show frontal projection; n, Hydroporus niger, 

 larva (a, Chatanay, 1910; b,c, F. Balfour-Browne, 1950; d-i, Leech, 1942; /,/, Bertrand, 1927; 

 k, F. Balfour-Browne, 1935; m, Needham and Williamson, 1907; n, Wilson, 1923). 



28 



mm. long 29 



Terminal segment of palpi (especially of labial palpi) 

 notched or emarginate at apex; pronotum clearly though 



narrowly margined laterally. COPTOTOMINI 



C optotomus Say 1834 



Terminal segment of palpi not emarginate at apex; 



pronotum with an exceedingly fine line along lateral 



edges, but not margined. AGABETINI 



Agabetea Crotch 1873 



29. Anterior point of metasternum (between middle coxae) 

 clearly triangularly split to receive tip of prosternal 

 process, the triangular channel usually deep with 



