PARNIDAE. 165 



of the mc'tatliorax arc narrow, the epimcra slightly visible bdiiiid-, 

 the eiji[)leurie are narrow, and continue to the apex. 



TrilK' II.— PAR]VIi\I. 



The head is capable of being retracted, and is then protected 

 beneath by the prosteruum, which is lobed in front; the anteiuue 

 are inserted on the front, distant and free at the margin of the 

 eyes in Lutrochus, approximate and at the inner extremity of 

 transverse grooves, and remote from the eyes, in the other two 

 genera; they are short, 11-jointed, and more or less irregular in 

 form. The anterior coxa? are not prominent, the trochantin small, 

 connate with sternum; the prosternal process is wide; the meso- 

 sternum broad, emarginate, the middle coxce with trochantin; the 

 side pieces of the nietathorax wide, with the epimera not visible, 

 except in Lutrochus, where they are narrow, with small epimera. 

 The epipleura? are narrow, and variable in form ; they are sud- 

 denly lobed in front, and extend to the apex in Lutrochus; they 

 are not suddenly lobed, but extend to the apex, in Pelononius; 

 while in Helichus they are not lobed, and extend much less dis- 

 tinctly to the apex. 



Body rounded ; antennse distant, club slender. Lutrochus. 



Body oblong, elongate ; 



Antennae slender, distant ; prosternal lobe short. Throscinus. 



Antennae apiiroximate, club pectinate. Pelonomtis. 



Antennae distant, second joint mucb dilated, club lamellate. Helichus. 



Lutrochus lute i(H \s f(mm\ m Texas; Pclonomus obf<cin^uH \n 

 the Southern and Western States ; Throscinus Crotchii Lee. in 

 California; Helichus is widely distributed, 



Sub-Family IIL— ELMIN.^. 



The anterior coxa3 are rounded, without trochantin; the abdo- 

 men has five ventral segments, the fifth rounded at tip; the front 

 is not prominent; the palpi are short; the antennas inserted ujion 

 the front, near the eyes, slender, slightly thickened externally; 

 middle coxse widely distant; posterior coxae separated, transverse, 

 not dilated into a plate protecting the thighs ; legs exceedingly 

 long ; side pieces of the nietathorax narrow, epimera not visible; 

 epipleuric narrow, extending to the apex. 



