392 COLEOPTERA OF NORTH AMERICA. 



more deg-raded Teuebrionidte and the subsequent families. The 

 antennae have a form of sensitive punctuation similar to tliat 

 observed in the Helopide series. From all those families in 

 which the anterior coxal cavities are closed behind, the 0th- 

 niidcB may be known by having all the ventral segments free. 



Five species of Othnius occur in our territory: one in Virginia, 

 the others in Colorado, Arizona, and California. Mr. H. K. Mor- 

 rison states that he found them running actively on the leaves of 

 trees ; they are probably predaceous. 



Other species occur in Mexico and Borneo. The genus was 

 described in lyCO under the preoccupied name ElacatU by Mr. 

 Pascoe. 



Fam. LXIL— lagriidae. 



Mentum transverse, trapezoidal, wider in front, supported 

 on a distinct gular process; ligula prominent; palpi 3-jointed. 



Maxilloe with two flattened, ciliated lobes; palpi 4-jointed, 

 moderate in size. 



Head prominent, horizontal, inserted into the thorax, more 

 or less constricted behind the eyes, which are transverse, 

 emarginate, and not finely granulated ; clypeus subcoria- 

 ceous; labrum prominent; mandibles short. 



Antennas 11-jointed, nearly filiform, inserted under very 

 small oblique frontal ridges. 



Prothorax narrower than the base of the elytra, subcy- 

 lindrical, with the lateral suture obliterated ; anterior coxal 

 cavities closed behind, and nearly confluent. 



Mesosternum moderately long, side pieces attaining the 

 coxal cavities; metasteruum long, side pieces narrow; epi- 

 mera not visible. 



Elytra rounded at tip, covering the abdomen ; epipleurte 

 narl^ow ; wings perfect. 



Abdomen with five free ventral segments, the anterior 

 four of which appear to be more ch)selj connected; fifth 

 rounded at tip, sixth sometimes visible. 



Legs slender; anterior coxa3 conical, prominent, without 

 trochantin, separated by a very narrow prosternum; middle 

 COX03 separated, with distinct trochantin; hind coxae trans- 

 verse; tibial spurs obsolete; front and middle tarsi o-jointed; 

 hind tarsi 4-iointed, with the first joint long; the penultimate 

 joint of all the tarsi (except in one foreign genus) is dilated, 

 emarginate, and clothed beneath with a dense brush of hairs; 

 claws simple. 



