lore gut (stomodeum) 



cecum 



mid gut (mesenteron) 



malpighian tubule 



lunction ot mid gut 

 and hind gut 



hind gut (proctodeum) 



Circumesoptiageal 

 connective 



subesophageal ganglion 

 1st thoracic ganglion 



1st abdominal ganglion 

 2nd 



fused 5th to 8th 

 abdominal ganglia 



sperm tube or 

 lobe of testis 



was etterens 



vas detereni 



lateral accessory 

 gland 



median lateral 

 accessory gland 



seminal vesicle 

 ejaculatory duct 



penial spicule 



basal piece or 

 lobe 



paramere or 

 lateral lobe 



penis or median lobe 

 ostium o1 interna! sac 



aedeagus or 

 male genitalia 



egg tube or ovanole 



spermatheca 



lateral oviduct 

 median oviduct 

 spermathecal duct 

 bursa copulatrii 

 vag ina 

 bacuium (valviler) 



hemisternite (comte) 



stylus (may protrude 

 externally) 



temale 

 genitalia 



Figs 8-11 Adult elmid beetle: 8- dorsal aspect of digestive tract 

 of Neoaylloepus; 9- central nervous system of Neoaylloepus; 



10- male reproductive system, dorsal aspect, of Neoaylloepus; 



11- female reproductive system, dorsal aspect. 



If the reader is unfamiliar with insects, he would be well advised to 

 consult a general textbook of entomology. For general coverage of 

 aquatic insects, two books are outstanding. The sections of these books 

 dealing with the Coleoptera are cited in the bibliography: Leech and 

 Chandler (1956), and Leech and Sanderson (1959). Both were extremely 

 helpful to me in the preparation of the keys which follow, as was the 

 work of Sanderson (1953-54) . 



10 



