82 Mr. G. C. Champion's Revision of the Mexican 



sparingly from Oaxaca. Extremely like Discodon melan- 

 cholicum {— triste), but with the outer claw of the inter- 

 mediate and posterior tarsi of the male lobed at the base 

 (instead of cleft), the median vitta of the prothorax not 

 dilated into a cruciform patch, the margins usually dis- 

 tinctly sinuate in the female, the antennae of the male 

 shorter, and sparsely pubescent as in the female. Three 

 males dissected, one only showing the slender flagellum. 



13. Polemius bivittatus. (Plate III, fig. 10, $, var. ^.) 



Discodon biviUatum, Gorh., Biol. Centr.-Am., Coleopt. iii, 



2, p. 87. 

 Polemius bivittatus, Schaelf., Journ. N. York Ent. Soc. 



xvi, p. 61. 



Elongate, dull (shining, when immature), finely pubescent; 

 nigro-piceous or fuscous, the anterior portion at least of the head, 

 the basal joint of the antennae in some specimens, the prothorax 

 (two black sinuous vittae or spots on the disc excepted) and 

 scutellum, the suture and outer margin of the elytra, the coxae, 

 trochanters, and femora in some examples, and the abdomen in 

 part or entirely, testaceous. Eyes rather small, a little larger in 

 cj. Antennae very long, slender and subfiliform in $, still longer, 

 subserrate, and closely pilose in ^. Prothorax {^) transverse, 

 arcuate in front, binodose on the disc posteriorly, the margins 

 explanate and reflexed, at most feebly notched or sinuate at about 

 the middle; (?) broader, subtruncate at the apex, the margins more 

 or less rounded. Elytra subparallel, wider than the prothorax^ 

 rather finely sculptured. Inner claw of anterior tarsi, and outer 

 claw of the other tarsi, broadly lobed at base in ^. 



Var. a. Prothoracic vittae united into a large, laterally emarginate 

 black patch ; legs black. $. 



Var. ^. Elytra flavous, with the sutural and outer margins, and 

 a narrow oblique stripe extending down the disc from the shoulder 

 to very near the apex, black; femora testaceous. $. (Fig. 10.) 



Var. y. Elytra and femora testaceous. <^. 



(J. Eighth ventral segment shortly trilobed at the apex; ninth 

 segment rather short, oval, subtruncate, the tips of two pairs of 

 stout hooks and that of a central flagellum visible (fig. 33). 



Length (excl. head) 8-12|, breadth 2f-5 mm. (^ ?.) 



Hab. Mexico, Vera Cruz, Guerrero (Chilpancingo and 

 Omilteme), Oaxaca; Guatemala, Quiche Mts., Calderas 

 {Champion), Capetillo (Rodriguez). 



