HYDKOFH1LID.E. 41 



HYDKOPHILITES Heer. 



The generic name is given by Heer to the following fossil species, 

 allied to Hydrophilus. No other species is known. 



HYDROPHILITES NAUJATENSIS. 



Hil<li<i>li'iHt,x iKiitjiitoixlx Hfi-r. Floni t'oss. Groenl.. II, 144. pi. MH, fig. li't); pi. loy, 

 tig. 1<> (IssM). 



Naujat, Greenland. 



1IYDKOCHARIS Latreille. 



A widespread but rather limited genus, three species of which occur 

 in the United States. The species from Colorado here described is the only 

 one known in a fossil state. 



HYDKOCHARIS KXTRICATUS sp. nov. 

 PI. V. tig. 4, 



The single specimen referred here is slenderer and smaller than any of 

 our existing species, and further differs in the great size of the eyes, which 

 are transverse and separated by less than double their own width, and the 

 excessive length of the terminal spines of the hind til me, both of which are 

 nearly half the length of the tibiae. Being preserved on a ventral aspect 

 any punctuation of the elytra is invisible. The sternal carina appears to 

 be very slender and to extend beyond the hind coxae to a length rather 

 more approaching its character in Hydrophilus, though it certainly does not 

 extend beyond the second abdominal segment, and the prosternum appears 

 to be equally carinate with the hinder parts of the thorax. 



Length, 13 mm.: breadth, mm. 



Florissant, Colorado; one specimen, No. 692. 



BEROSUS Leach. 



A widespread and tolerably rich genus, well supplied with North 

 American species. The only fossils known are those here recorded from 

 Wyoming. 



