184 



GUIDE TO CALIFORNIA INSECTS. 



AMPHIZOID/E. 



Amphizoa insolens Lee. 



GYRINID/E. 



This family consists of the surface feeding water beetles called "whirligig 

 bugs" because of their very peculiar habit of swimming. They are predaceous 

 also in the larva stage living at the bottom. 

 Dyneutes sublineatus (not California). 

 Gyretes sinuatus Lee. 

 Gyrinus affinis Aube. 



confinis Lee. 



pareus Say. 



DYTISCID/t. 



The beetles of this family are aquatic and predaceous. 

 Acilius laticinctus — Thermonectes bas- fossiger — Agabus morosus. 



eonsobrinus Lee. 

 fuscipes (undetermined), 

 niarginiventris — plicifer. 

 plicifer Lee. 



latiusculus — semisuleatus. 



simplex — semisuleatus. 



semisuleatus Aube. 

 Agabinus glabrellus IVlots. 

 Agabus austenii Sharp. 



brevieollis (Lee.) 



confertus (Lee.) 



discolor — lecontei. 



erichsoni (undetermined). 



interseetus (Croteh). 



leeontei (Crotch.) 



lineeilus (Lee.) 



lugens Lee. 



lutosus — lugens. 



morosus (Lee.) 



morulus Lee. 



nigro^neus Er. 



obliteratus (Lee.) 



obsoletus (Lee.) 



per plexus — suturalis. 



semivittatus (not California). 



strigulosus (Croteh). 



suturalis (Crotcn). 



tristis Aube. 

 Bidessus affinis >ay. 



amandus Lee. 



emctellus (Lee.) 



nigrinus Casey. 



pietodes Sharp. 



plieipennis (Croteh). 



subtilis (Lee.) 

 Coelambus hydropieus Lee. 



luteseens Lee. 



medialis Lee. 

 Colymbetes anthrax Lee. 



colloseus Lee. 



densus Lee. 



divisus Aube. 



glabrellus Mots. 



inajqualis — seniiniger. 



soulptilis Harr. 



ssminiger Lee. 



sobrinus — Agabus nigroae.ieus. 



strigatus Lee. 

 Copelatus chevrolatii Aube. 

 Coptotomus interrogatus Fabr. 

 Cybister elliptieus Lee. 



explanatus Lee. 

 Cymatopterus inaequalis Horn. 

 Derenectes depressus Fabr. 



ciriseostriatus DeG. 



striateilus (l-ec.) 

 Desmopaehra latissima (Lee.) 

 Dytiseus anxius — eircumeinetus. 



eireumeinctus Lee. 



fuscostriatus — eireumeinetus. 



marginieollis Lee. 



sublimbatus Lee. 

 Eretes stietieus Linn. 

 Caurodytes brevieollis — Agabus. 



conferatus — Agabus. 



interseetus — Agabus. 



lecontei — Agabus. 



lineeilus — Agabus. 



lugens — Agabus. 



morosus — Agabus. 



obsoletus — Agabus. 



semivittatus — Agabus. 



strigulosus — Agabus. 



suturalis — Agabus. 



tristis — Agabus. 

 Graphoderes einereus Linn. 



oceidentalis Horn. 

 Hydaticus morm-^ratus — Thermonectes. 



stagnalis Fabr. 

 Hydroporus addendus Crotch. 



