AMERICAN COLEOrTERA. 31 



mento Valley form the habitat of this insect. I am quite certain that 

 I saw a living specimen adhering to a log under water in a swift stream 

 near Fort Crook. 



Tribe IT. — Parnini. 

 Three genera only represent this tribe in our fauna, distinguished as 

 follows : 



Body rounded; eyes not hairy. 



Antennse distant; second joint large; last joint of maxillary 



palpi securiform Lutrochus. 



Body elongate. 



Antennte approximate; eyes hairy; last joint of maxillary 



palpi elongate ....Pelonomus. 



Antenna distant; eyes glabrous; last joint of maxillary palpi 



elongate Helichus. 



An examination of all the genera of this tribe has shown me that 

 the hind coxa3 are very distinctly separated, and cannot be called sub- 

 contiguous, even iu Farnm, as has been done by Lacordaire, (Grcnera 

 II, p. 504). The genus Lutrochus may be known by the form of the 

 epipleuraj which are suddenly lobed in front. The second antennal 

 joint is large in Helichus and small in Pelonomus. All have the outer 

 joints of the antennse (4-11) distinctly lamellate, with the joints not 

 <'-reatly varying in size either in length or width. 



LUTROCHUS, Erichs. 

 Lutrochus, Erichs. Ins. Deutsch. Ill, p. 509. 

 L. luteus, Lee. Proc. Acad. 1852, p. 42. 



A small, oval insect densely clothed with luteous hair and with an 

 seneous tinge. Length .12 inch ; 3 mm. 



Fort Gates, and McLennan Co., Texas, Belfrage. 



PELONOMUS, Erichs. 

 Pelonomus, Erichs. Ins. Deutsch. Ill, 510. 



Resembles in form the European Panius, but may be easily known 

 superficially by the absence of any lateral thoracic grooves. 

 P. obscurus, Lee. Proc. Acad. 1852, p. -12. 



Length .26 inch; 6.5 mm. Occurs in the Southern and Western 



States. 



HELICHUS, Erichs. 

 Jlelichus, Erichs. Ins. Deutsch. Ill, p. 510. 



A careful examination, especially of the larger species of the genus 



shows the tibial spurs to be quite distinct. 



Our species may be distinguished as follows: 



Last abdominal segment densely pubescent: 



Spurs of tibiffi quite distinct but small productus. 



