On Aquatic Carnivorous Coleoptera or DytiscidcB. 



371 



'Prostemal "i 

 process not I 

 touching I 

 metaster- I 

 num. J 



Epipleura nar- 

 rowed from 

 shoulder to 

 hind margin 

 of first vent- 

 ral segment; 

 after that 

 veiy slender 

 and neces- 

 sarily, thenre- 

 fore, nearly 

 parallel. 



Prostemal 

 process 

 touching 

 metaster- 

 num. 



Terminal joint 

 of front tar- 

 sus elongate ; 

 intercoxal 

 process of 

 metasternum 

 not connect- 

 ing with me- 

 sosternal 

 fork. 



'Last joint ofj 

 front tar- 

 sus about i 

 as long as 

 the third | 

 joint. J 



Last joint of 

 front tar- 

 sus twice 

 as long as 

 third joint. 



L 



Terminal joint "l 

 of front tar- 

 sus short ; 

 intercoxal 

 process of me- [■ 

 tasternum 

 touching me 

 sosternal 

 fork. 



'Elytra with- 

 ovit definite 

 genicular 

 fossa. 



Elytra with 

 definite ge- 

 nicular fossa 

 at shoulder 

 of epipleura. . 



AKDEX 

 ( Vide below). 



CCELHTDRUS 

 {Vide p. 373.) 



PRIMOSPES 

 {Vide -p. 372.) 



UYDROPEPLUS 

 (Vide p. 372.) 



HYPHYDRUS 

 (Vide]). 374.) 



I. 25.— Genus ^iVi)^X 



Prostemal process abbreviate ; its concealed extremity not extending outside 

 the middle cox^, and not reaching the metasternum. Prothorax much narrower 

 than the after-body, so that the outline at the shoulders is very interrupted. 



A single South African species is the only one yet known. 



328. Andex insignis, n. sp.— Depressiusculus, subopacus, sine pubescentia, capite 

 nigricante anterius ferrugineo, thorace ferrugineo, medio maculis duabus vage 

 fuscis, elytris obscure ferrugineis, pectore abdomineque nigris, hoc apicem versus 

 ferrugineo ; antennis pedibusque rufescentibus ; thorace elytrisque sparsim subtiliter 

 punctatis, illo medio ante basin transversim depresso ; pectore abdomineque opacis 

 sed vix punctatis. Long. 5i, lat. 3 m.m. 



TSAK9. BOT. DUB. SOC, U.S., TOI.. U. 



