Coleoptera 7 E 



Genus Polygraphus Erich. 

 Erichson, Weig. Archiv., 1 :57. 



Polygraphus rufipennis Ky. 



Plate II, figure 2. 



Kirby, Faun. Bor. Amer., 4:193, tab. 8, fig. 2, Apate (Lepisomus) 1837, 

 Apate (Lepisomus) nigriceps Ky. Kieby, loc. cit. 194, Polygraphus saginatus 

 Mannh. Mannerheim, Bui. Mosc., 237, 1853; Apate (Lepisomus) brevicornis 

 Ky. Kirby, loc. cit., 194, (Probably not rufipennis, but injured and unrecog- 

 nizable.) 



A stout cylindrical species, clothed with scales. Length, 2 mm. to 3 mm., 

 colour black, elytra very dark piceous. 



DESCRIPTION OF THE FEMALE. The head has the front flat, shining, 

 finely and closely punctured, and rather densely clothed with short yellow 

 hairs, denser in a subcircular fringe about the margin of the front, extending 

 about the base of the mandibles and between the sections of the eyes; the vertex 

 and gense with dense and minute punctulations and a few large, shallow punc- 

 tures, almost glabrous; the eyes completely divided and surrounded by a narrow 

 shining border; the epistomal margin raised, shining, and very broadly emar- 

 ginate; the antennal funicle usually with six segments, the pedicel large, the 

 club unsegmented, subacute at the tip, closely pubescent. The pronotum is 

 two-thirds as long as wide; the caudal margin sub truncate, bisinuate, the sides 

 on caudal half straight, slightly convergent, deeply, suddenly constricted in 

 front of the middle, front margin broadly arcuate, feebly emarginate at middle 

 line; closely finely granulate-punctate and clothed with short scale-like hairs; 

 with a very fine indistinct median raised line. 



The elytra are two and one-half times as long as wide; as wide as the 

 pronotum at the base; the bases individually moderately arcuate, finely raised 

 and crenulate, the striae very faintly indicated; the elytra closely, finely asperate- 

 punctate, with a row of coarser asperities along each interspace and these 

 larger asperities confused and numerous towards the base of the disc; the strial 

 punctures with minute slender inconspicuous setae; the numerous punctures of 

 the interspaces with short, blunt, stout, scale-like hairs, with those from the 

 row of coarser asperate punctures longer, particularly towards and upon the 

 declivity and on the sides; so the pubescence is rather closely subscale-like, 

 with a row of longer, lighter coloured, stout hairs on each interspace, and the 

 finely asperate surface showing through. 



THE MALE. The male has the front convex above with two small approx- 

 imate tubercles arranged transversely on the middle line; impressed cephalad of 

 the tubercles; the pronotum usually shorter, and more deeply constricted in 

 front. 



VARIATIONS. The size varies from 2 mm. to 3 mm. in length. The colour 

 varies from piceous to nearly black. The front of the male has sometimes 

 only one frontal tubercle and the anterior impression varies in depth. The 

 most interesting variation is in the segmentation of the antennal funicle. This 

 is typically six-segmented, with the second segment small and the distal segments 

 widened. Not infrequently however, we find a reduction in the number. Two 

 more common conditions are with four segments on the outer part of the funicle 

 of which the second segment is partly divided by a deep suture, or with the 

 second and third segments almost entirely fused. It is very evident that the 

 segmentation of the antennal funicle is a variable character in this species, 

 as in other allied species. This subject is further referred to under the Genus 

 Polygraphus, Dom. Ent. Br., Bull. 14, Part 2. 



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