AMERICAN COLEOPTERA. 79 



The species of this genus are cuneiform, of a blackish color varied 

 with irregularly diffused, grayish pubescence ; scutel usually einarginate 

 behind ; anal style short, obtuse ; hind tibiae and tarsi without ridges 

 except the short subapical one of the former; eyes finely granulated; 

 antennae serrate ; last joint of maxillary palpi more or less elongate, 

 triangular and moderately thick, with the extremity hollowed out, 

 sometimes broadly securiform. 



Mordella, hilaris Say. for which Dr. LeConte described the genus 

 Glipa, belongs I believe to this genus. Glipa was based on the 

 broadly securiform maxillary palpi and the non einarginate scutellum ; 

 but T. lineella has the palpi nearly as broad, and the latter characteristic 

 is so minute, and the emargination in Tomoxia (sensu LeConte), is so 

 small that I cannot persuade myself to consider it as distinct. 



A. — Scutel emarginate behind. 

 I. — Last joint of maxillary palpi long, triangular ; base of thorax rounded at 

 middle. 

 Elytra with broad bunds not extending behind the middle, a posterior fascia 

 composed of spots, and apical margin cinereous; a large rhomboidal dark 

 spot each side near base. 10 — 13 mm. ; Middle and Western States. 



l. bidentata. 

 II. — Last joint of maxillary palpi securiform; base of thorax sub -emarginate at 

 middle. 

 Elytra with narrow lines, and subapical fascia cinereous; dark markings all 



narrow. 5 — 7 mm.; Middle and Western States 2. lineella. 



Elytra with a broad basal fascia, including each side a round black spot; 

 transverse spot behind the middle, apex, suture and margin cinereous. 

 a mm. ; Western States 3. iuclusa. 



B. — Scutel not emarginate behind. 

 Maxillary palpi broadly securiform : black varied with cinereous hair; elytra 

 with a narrow, sub-basal band oblique inward, and a broad one oblique out- 

 wards, brown pubescent : connected along the suture and margin with cinere- 

 ous pubescence. 9— 13 mm.; Middle and Western States 4. hilaris. 



1. T. bidentata Say, Journ. Ac. Nat. Sc. Phila. iii, L'77, (Mordella). (PL I, 



fig. 27). 



Our most common species : found so far as [ know only on dead 

 trees. I have never caught it myself, but Prof. Schaupp informs me 

 that he has seen it in large numbers in northern New York, in such 

 situations. The specimens vary somewhat in the distinctness of their 

 markings, and few indeed present them so sharply outlined as they 

 are in the figure. 



2. T. lineella Lee. Pr. Ac. N. Sc. Phil, xiv, 4a. (PL I, tig. 28, palpi fig. 31). 



Much more rare than the preceding and differing from it in the 

 form of the maxillary palpi, in which it agrees with Glipa, and in the 



