June, 1908.] SCHAEFFER : LlST OF THE LaMPYRIDjE. 65 



The genus Discodon Gorh. is, as stated already above, very closely 

 allied to Polemius Lee. from which it differs only in having the outer 

 claws of the middle and hind tarsi of the males cleft. 

 Discodon flavomarginatum, new species. 



Head black, front yellow ; black part finely punctate. Antenna: black, slender, 

 extending below middle of elytron ; joints elongate. Thorax transverse ; apical 

 margin broadly rounded, angles entirely obliterated ; side margin broadly refiexed, 

 nearly parallel and feebly rounded; lateral incisure at about basal fourth, deep and 

 oblique ; hind angles rounded ; basal margin broadly rounded at middle; basal im- 

 pression deep, limited on each side by the refiexed side margin ; color reddish, with 

 a black median vitta of nearly equal width, narrower than the pale space on each 

 side. Elytra feebly dilated a little below the humeri ; surface finely scabrous, costre 

 scarcely evident ; color dark brown, lateral margin rather broadly pale. Beneath, 

 except thorax, black. Outer claw of anterior and intermediate tarsi broadly lobed ; 

 outer claw of posterior tarsi cleft. Penultimate ventral segment broadly, triangu- 

 larly emarginate. Last ventral deeply divided. Length 14 mm. 



Huachuca Mts., Arizona. 



Judging from the short description this differs from Polemius 

 princeps Lee, which it seems to resemble in the broadly rounded 

 hind angles and the lateral incision of thorax at about basal fourth. 

 From the allied Mexican species it differs in having the outer claw of 

 only the hind tarsi cleft. 

 Polemius niger, new species. 



Entirely black, except mandibles. Head finely punctate. Antennae slightly 

 flattened, extending to the middle of elytra. Thorax transverse ; anterior margin 

 broadly rounded, angles obliterated; lateral margin rather narrowly and relatively 

 strongly refiexed, sides gradually widening towards base, feebly undulate slightly 

 before middle ; base feebly arcuate, hind angles broadly rounded. Elytra scabrous 

 and feebly costate, side margin below humeri feebly explanate. Last ventral seg- 

 ment rounded at apex. Length 9 mm. 



Huachuca Mts., Arizona, one female. 



Distinct from any of the North American species by the uniform 

 black color, but seems to be very close to Discodon melancholicum Gorh. 

 Polemius arizonensis, new species. 



Head black, pale in front, densely punctate. Antennae black, first two or three 

 joints more or less pale. Thorax transverse, apical margin broadly rounded, angles 

 obliterated ; side margin obliquely incised at about middle ; basal margin feebly 

 rounded, basal impressed line distinct, hind angles rounded; color reddish yellow 

 without black vitta or spot. Scutellum reddish. Elytra black, scabrous ; cost..- in- 

 distinct ; surface finely pubescent, which gives the elytra a somewhat pruinose aspect. 

 Underside of body reddish, metasternum, tibiae, except at base, and tarsi, black. 

 Penultimate ventral segment very deeply triangularly emarginate ; last ventral deeply 

 divided. Length 7.5 mm. 



Huachuca Mts., Arizona. 



