510 CLAVICORNIA — PARNIDAE. 



PAJRNIDAB, 



A. Anterior coxae globular. 



Antennae thin, apical j'oints scarcely thickened ; man- 

 dibles with two-toothed apex Ijut not toothed lielow ; outer 

 lobe of maxillae narrower than inner ; posterior coxae not 

 dilated. Elmides. 



J5. Anterior coxae semi-cylindrical. 



Antennae usually irregular, second joint much dilated 

 and covering succeeding joints. Mandibles toothed l)elo\v 

 apex ; outer lobe of maxillae as broad as, or broader than 

 inner ; posterior coxae usually dilated. Parnides. 



ELMIDES. 



A. Antennae with six joints. 



Head covered beneath by prosternurn ; palpi threadlike ; 

 tibiae closely and finely fringed from middle to apex of 

 inner-side. 3facronychus, Mtill. 



li. Antennae with eleven joints. 



Head covered beneath by prosternum ; palpi threadlike; 

 tibiae fringed on inner-side. 



ft. Scutellum oblong, narrow. 



Sides of breast and of abdomen thickly covered with 

 fine matted hairs. Elmis, Latr. 



b. Scutellum roundish. 



Sides of tliorax, elytra, breast and abdomen thickly 

 covered with fine matted hairs. Limnius, Er. 



MacronycJi/iift. 



Oblong, narrow. Black, sliglitly metallic ; anterior mar- 

 gin of thorax and antennae red-yellow ; legs pitch-brown. 

 Thorax and elytra with two tubercles bearing bristles on 

 base of each, those on former being roundish and those on 

 latter oblong, standing in second interstice. L. 1-^ — 1| 1. 

 Itare. 3f. quadrit^therculatus, Miill. 



Elmis. 



A. Tliorax uneven, with raised longitudinal lines on sides 

 of disc, transversely impressed behind. 



