166 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



cleft. These four reservoirs are situated one above the other 

 almost as gigantic steps, the lower broken so that water does not 

 stand in it, and only the second is accessible by ladder and con- 

 tains two to six feet of water. In this water the following insects 

 were taken in June 1901 : 



Cnemidotus (Peltodytes) simplex. 



Desmopachria n. sp. 



Desmopachria mexicana. 



Laccophilus terminatus. 



Laccophilus lateral-is. 



Laccophilus ellipticus. 



Bidessus cinctellus. 



Bidessus subtilis. 



Hydroporus corvinus. 



Thermonectes marmoratus. 



Hydrochus vagus. 



Hydrcena sp. 



Berosus n. sp. 



Helochares normatus. 



Odonate larvae (Dragon flies), various species. 

 It will be seen that the interest in the insects found in the Hot 

 Springs of Arizona centers in two species of Coleoptera, viz., the 

 Hydrophilid, Epimetopus and the little Hydroscapha which is, 

 according to all authorities the representative of a separate fam- 

 ily. A description and figure of the new Epimetopus will be fur- 

 nished at some future time but the occurrence of the genus Hydro- 

 scapha so remote from its type locality, and moreover the dis- 

 covery of its earlier stages present a peculiar interest so that I 

 feel justified in presenting a bibliography of the genus and a short 

 account of the circumstances under which the genus has been 

 found in Arizona. These notes are intended solely as an intro- 

 duction to the following important paper by Dr. Boving. Whether 

 or not the Arizonan species of Hydroscapha is different from the 

 Californian species (natans) can not be ascertained at present 

 since specimens of the latter are not at hand for comparison. 



BIBLIOGRAPHY OF HYDROSCAPHA. 



1874. LECONTE, (Trans. Am. Ent. Soc. v, pp. 45-46) in erecting the family 

 Hydroscaphidce, with //. natans Lee. as the only species, says: 

 " [This insect] seems to me another of the synthetic types gradu- 

 ally becoming known to us among the smaller and more obscure 

 forms, connecting several different families of the Clavicorn se- 

 ries, in this instance the Hydrophilidce, Scaphidiidae, and perhaps 

 the Trichopterygidse. In the accepted arrangement of Coleoptera 

 it must be considered as indicating a new family." 



