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



treat P. bimaculatus as a colour variety of the former, 

 P. hinotatus, Fall, from the Chiricahua Mts., S. Arizona, 

 a male of which has been sent me by its describer, is an allied 

 form with wholly black, less rugose, more shining elytra, 

 imiformly testaceous femora, etc. P. arizonensis, SchaefT., 

 has the antennal joints 3-5 shorter and wider than in 

 P. hinotatus, the prothorax immaculate, etc. 



18. Polemius megalophthalmus, n. sp. (Plate III, fig. 11, ^.) 



Elongate, narrow, shining, cinereo-pubescent ; black or piceous, 

 the base of the mandibles, the anterior portion of the head wholly 

 {,^) or at the sides (§), the prothorax and scutellum, the abdomen 

 in part, and the base of the femora in <^, testaceous. Head together 

 with the eyes very much broader than the prothorax in ^, of about 

 the same width in $, the eyes enormously developed in (J, small in $ ; 

 antennae serrate, in o longer than the entire body, in $ very much 

 shorter. Prothorax (^) almost smooth, nearly as long as broad, 

 narrow, arcuate in front, the margins narrowly reflexed, and 

 obliquely compressed and feebly incised at about the basal third, 

 the hind angles subrectangular ; ($) transverse, less rounded in 

 front, the margins shallowly notched at the basal third. Elytra 

 long, parallel, wider than the prothorax, rugosely sculptured and 

 feebly costulate. Inner claw of anterior tarsi, and outer claw of 

 the other tarsi, lobed at base in ^. 



(J. Ninth ventral segment truncated at the apex, the corresponding 

 dorsal portion of the same segment narrower and also truncate; 

 two pairs of long, stout hooks projecting from the internal sac. 

 (Fig. 35.) 



Length (excl. head) 6-7, breadth 2-2| mm. (^ $.) 



Hah. Mexico, Ventanas in Durango (Hoge). 



Five males and four females. This species is not unhke 

 one of the varieties of Discodon inconstans, except that it is 

 smaller and very much narrower. The male has enormously 

 developed eyes and greatly elongated, serrate antennae, 

 characters separating P. megalophthalmus from most of 

 its allies. The prothorax is shining, almost smooth, and 

 without definite callosities on the disc towards the base. 

 The apically undivided, simply lobed tarsal claws of the 

 male distinguish the present species from Discodon incisutn 

 and others ; and the non-callose prothorax, larger eyes in (^, 

 etc., from P. {Silis) longicornis, Gorh. 



