42 COLEOPTERA OF NORTH AMERICA. 



axis of the head, moderately prominent, but distant beneath from 

 the mouth. Clypeus feebly prolonged, a setigerous puncture each 

 side. Labrum feebly prominent, slightly emarginate, sexsetose. 

 Mandibles acute at tip, without setigerous })uncture externally. 

 Maxillae slender, sliglitly hooked at tip, spinulose and ciliate in- 

 ternally, outer lobe slender, biarticulate, the terminal joint shorter ; 

 the palpi moderate in length, the terminal joint obovoid, suddenly 

 narrowed and prolonged at tip, surface pubescent. Mentum 

 deeply emarginate and with a short obtnse tooth ; ligula not 

 prominent, emarginate and bisetose at apex, the tip free for a 

 short distance, paraglossse slightly longer than it; palpi moderate, 

 the terminal joint like that of the maxillary, the penultimate bisetose 

 in front. Thorax ovate, somewhat constricted at base, margin 

 almost entirely obliterated, sides with two setigerous punctures 

 placed almost as in the Glivinse. Body distinctly pedunculate, 

 scutellum not visible between the elytra. Elytra not margined 

 at base, and without scutellar stria, lateral margin obsolete, sides 

 narrowly inflexed, apex subtruncate, disk striate at base, dorsal 

 punctures three, but indistinct. Prosternum not prolonged. 

 Mesosternum oblique, the epimera very narrow. Metasternal 

 epimera distinct ; posterior coxte separated. Legs slender, tibia? 

 ciliate externally, the anterior deeply emarginate within. Tarsi 

 slender and long, fourth joint entire. Claws simple. 



The anterior tarsi of the male are merely a little stouter than 

 those of the female and somewhat more ciliate. 



But one genus constitutes this tribe, Erja, represented in our 

 fauna by two species^ Sallei from the Gulf States, Isetula from 

 California. In the first the elytral grooves or stria? do not extend 

 behind the middle, and the three dorsal punctures are faintly 

 indicated; in the second the strife extend at least two-thirds of 

 the elytra and no dorsal punctures are visible. They are grega- 

 rious, and run upon the soft mud of the river bank. 



Tribe XXVI.— LEBIIIVI. 



Antennfe slender, rarely slightly thickened, arising under a 

 slight frontal I'idge, the condyle usually exposed, usually with 

 three basal joints glabrous, sometimes however but two or four. 

 Head oval, constricted to a neck or not, with two supra-orbital 

 setae, front either parallel or with convergent sides, clypeus with a 



