Survey of Families, Including a Synoptic Key to the 

 Aquatic and Semiaquatic Hemiptera. 



The water bugs that have been the object of these studies 

 do not represent a close phylogenetic relationship within the 

 Hemiptera. They belong to various categories, or "series," 

 and are here treated together because they are members of 

 a definite ecological factor, the water. In giving a brief sur- 

 vey of the relationships the writer follows Van Duzee's cata- 

 logue, who, in turn, follows Reuter, 1912. The arrangement 

 and names are those of Van Duzee. Only the Heteroptera are 

 discussed. It is true that certain aphids have been found living 

 on the under surface of lily pads, but they have not been in- 

 cluded. Arranged synoptically Van Duzee's classification fol- 

 lows. In the "Table to Heteroptera" the aquatics are shown 

 in italic type. 



A. Series POLYNEURIA. 



B. Supf. Scutelleroidese. 



C. Phal^^nx Pentafomiformes. 

 Scutelleridae. 

 Cydnidse. 

 Pentatomidse. 

 BB. Supf. Coreoideae. 



Coreidag. 



A A. PHLCEOBIOTICA. 



Aradidae. 



AAA. ONYCHIOPHORA. 



B. Supf. Lygseoidese. 



C. Phalj^nx Lygaeiformes. 



Neididas (Berytidae). 

 Lygaeidae. 

 CC. Phalanx Pyrrhocoriformes. 

 Pyrrhocoridae. 

 AAAA. ANONYCHIA. 



Tingididae. 



B. Supf. Rediivioidess. 



C. Phalj^nx Enicocephaliformes. 

 Enicocephalidae. 



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