PHALACRIDAE. Ill 



iiiul the elytra are broadly truncate, periuittiug the tip of tlie 

 eoiiicai abdomen to appear. All the known genera of the family, 

 (except Amalocera, are represented in our Atlantic fauna, but 

 Scaphisouia alone has yet been obtained on the Pacific slope. 



I. Scutellum distinct ; aiitennnB clavate ; 

 Posterior tibiae not spinous ; 



First joint of hind tarsi longest; eyes emarginate. Scaphidiuna. 



First joint of liind tarsi scarcely longer tlian the second ; eyes 



entire. Scaphium. 



Posterior tibiae with rows of small spines ; eyes entire. Cyparium. 



II. Scutelhini covered by the base of the thorax ; antenna caj^illary ; 



Posterior coxae widely distant ; 



Antennae with the joints 9—11 wider. Beeocera. 



Antennae with the joints 6 or 7-11 wider. Scaphisoma. 



Posterior coxae not widely distant; body narrow, conipresse'l. 



To2:idium. 



Fam. XVITL— PHALACRIDAE. 



Mentum corneous, ilat, of a different form in each genus, 

 but all derived from the quadrate form. 



Maxillo3 with two lobes, internal one coriaceous, with two 

 small terminal teeth; the outer corneous, ciliate at tlie tip, 

 which is coriaceous. 



Antennae inserted under a slight frontal margin, ll-jointed, 

 tlie last three joints forming an oval club. 



Prothorax with the side pieces not distinct; prosternuni 

 ])rolonged, entering the emarginate mesostcrnum behind ; 

 coxal cavities not closed behind. 



Mesostcrnum very short, side pieces large, not distinctly 

 divided. 



Metasternum large, produced anteriorly, side pieces nar- 

 row, partly concealed by the sides of the elytra. 



Elytra rounded at tip, entirely covering the abdomen. 



Abdomen with five free ventral segments, not ditTering 

 much in length, the first somewhat longer. 



Anterior coxae globular; middle coxre transverse, sepa- 

 rated by the sternum ; posterior contiguous, transverse, flat. 



Legsshort, stout; thighsbroad, compressed ; tarsi 5-jointed, 

 with the first throe joints hairy beneath, and more or less 

 dilated, the fourth very small, fifth moderate; claws witli a 

 basal tooth. 



