72 MISC. PUBLICATION 6 9 8, U. S. DEPT. OF AGRICULTURE 



timus Casey (1898) I am unable to find any constant characters for 

 separating it from cornutus. 



Amphicerus (Schistoceros) bimaculatus (Olivier) 



Bostrichus Mmaculatus Olivier, 1790, Encyc. MSthodique, Insectes, v. 5, pp. 107, 

 109-110 ; 1795, Entomologie, v. 4, Gen. 77, pp. 10-11, pi. 2, figs. 14a-b ; Kiesen- 

 wetter, 1877, in Erichson, Naturgesch. Insect. Deut. Coleopt., v. 5, pt. 1, p. 37. 



Bostrychus Mmaculatus Zoufal, 1894, Wien. Ent. Ztg. 13 : 41. 



Apate Mmaculatus Herbst, 1793, Natursystem Insekten, Kafer, v. 5, p. 75 ; Jacque- 

 lin-Duval, 1859-1863, Genera Coleopt. Europe, v. 3, Cat. p. 167, pi. 56, fig. 279 ; 

 Perris, 1877, Larves Coleopteres, p. 219; Rey, 1887, Lyon Soc. Linn. Ann. 

 (1886) (ser. 2) 33: 219-220. 



Schistoceros Mmaculatus Lesne, 1899, Soc. Ent. de France Ann. (1898) 67: 

 508, 520-522, figs. 128-131 ; Schilsky, 1899, in Kuster and Kraatz, Kafer Europas 

 36 : No. 86 ; Lesne, 1901, Abeille 30 : 93, pi. 2, figs. 36-38 ; Csiki, 1903, Rov. Lapok. 

 10: 19; Semenov, 1903, Rev. Russe d'Ent. 3: 402; Reitter, 1911, Fauna Ger- 

 manica, v. 3, p. 301 ; Jakobson, 1913, Kafer Russland, pt. 10, p. 805. 



Amphicerus (Schistoceros) Mmaculatus Lesne, 1938, in Junk (pub.), Coleopt. 

 Cat, pt. 161, p. 42. 



The bibliography given for this species is not complete, as only the 

 more important articles have been cited. 



Male. — Elongate, cylindrical, uniformly black or brownish black, 

 the antennae, palpi, and tarsi brownish yellow. 



Head much narrower than pronotum, slightly flattened behind eyes, 

 densely, finely granulose over entire surface, with fine, longitudinal, 

 parallel carinae on occiput, densely clothed with long, erect, yellowish 

 hairs on clypeus and front of head; clypeus nearly flat, coarsely, 

 sparsely punctate, smooth along anterior margin; clypeal suture not 

 distinct; labrum finely, densely punctate, first segment of antennal 

 club subtriangular, produced on outer side at apex ; eyes small, trans- 

 verse. 



Pronotum quadrate, rounded in front, widest near middle, strongly 

 deflexed anteriorly; sides very broadly rounded, the apical angles 

 rounded and unarmed; surface coarsely imbricate-punctate on basal 

 half, coarsely, sparsely tuber culate anteriorly, the tubercles broad, 

 semierect, and rather acutely rounded at apices, densely, irregularly 

 clothed with semierect, yellowish hairs between tubercles on apical 

 half, with a large patch of long, recumbent, white pubescence, con- 

 cealing the surface, at each side on basal half. Scutellum densely 

 clothed with moderately long, erect, yellowish hairs. 



Elytra at base subequal in width to pronotum at middle, sinuate at 

 base, each elytron with a short, arcuate spine at top of apical declivity, 

 and a small tooth at apical angle of sutural margin ; sutural margins 

 slightly elevated on apical declivity; sides vaguely expanded pos- 

 teriorly, conjointly broadly rounded at apices, margins not elevated 

 but crenulate toward apices; surface coarsely, sparsely, very irregu- 

 larly punctate, more or less rugose, irregularly clothed with rather 

 dense patches of moderately long, recumbent, yellowish hairs, the 

 reliefs smooth and shining. 



Body beneath finely, densely punctate, densely clothed with long, 

 recumbent, white hairs. 



Female. — Differs from the male in having the apical declivity of the 

 elytra coarsely, densely, irregularly granulose, each elytron with a 

 round callosity at the top of the apical declivity, and in not having a 

 small tooth at the apices of the elytra. 



Length 5-11 mm., width 2-3.2 mm. 



