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



KEY TO THE SPECIES OF AMPHICERUS 



1. Prothorax armed with horns in both sexes __ subgenus Amphicerus LeConte 2 

 Prothorax not armed with horns in both sexes, -subgenus Schistoceros Lesne 3 



2. Elytra pubescent bicaudatus (Say), p. 68. 



Elytra not pubescent cornutus (Pallas) , p. 70. 



3. Pronotum with a large patch of dense white pubescence, concealing the 



surface at each side on basal half bimaculatus (Olivier), p. 72. 



Pronotum without a large patch of dense white pubescence on each side 4 



4. Front of head with long, erect hairs; elytra with long, erect hairs over 



entire surface; pronotum not distinctly expanded toward base 



teres Horn, p. 73. 



Front of head without long, erect hairs; elytra without long, erect hairs, 



but with a few short ones along lateral margins and at apices; pronotum 



strongly expanded toward base simplex (Horn), p. 74. 



Amphicerus (Amphicerus) bicaudatus (Say) 



Apate bicaudatus Say, 1824, Acad. Nat. Sci. Phila. Jour. 3 : 320-321. 

 Bostrichus Mcaudatus Fitch, 1856, N. Y. State Agr. Soc. Trans. 16 : 330 ; Walsh 



and Riley, 1868-1869, Amer. Ent. 1 : 80, 206, figs. 69, 141 ; Walsh, 1866, Pract. 



Ent. 1 : 27, fig. ; Riley, 1872, Ins. Missouri, Rpt. 4, pp. 51, 53, figs. 24-25 ; 1873, 



ibid., Rpt. 5, p. 54. 

 Amphicerus bicaudatus Shimer, 1868, Amer. Ent. Soc. Trans. 2 : Proc. pp. VIII- 



IX; Horn, 1878, Amer. Phil. Soc. Proc. 17: 547-548; Saunders, 1883, Insects 



Injurious to Fruits, pp. 33-35, figs. 21-22 ; Hubbard, 1888, Ent. Amer. 4 : 95-96 ; 



Lintner, 1896, N. Y. State Mus., Rpt. 49 (1895), p. 268; Casey, 1898, N. Y. 



Ent. Soc. Jour. 6 : 69 ; Marlatt, 1898, U. S. Dept Agr., Farmers' Bui. 70, pp. 



11-16, fig. 6; Blatchley, 1910, Coleoptera of Indiana, pp. 889-890; Leonard, 



1928, N. Y. (Cornell) Agr. Expt. Sta., Mem. 101: 415; Brimley, 1938, Insects of 



North Carolina, p. 197. 

 Schistoceros hamatus Lesne, 1899 (not Fabricius), Soc. Ent. de France Ann. 



(1898) 67: 506, 513-517, figs. 48, 106, 117; Quaintance and Shear, 1921, U. S. 



Dept. Agr., Farmers' Bui. 1220, pp. 38-39, figs. 39-40. 

 Amphicerus hamatus Lesne, 1938 (not Fabricius), in Junk (pub.), Coleopt. Cat, 



pt. 161, p. 41; Anderson, 1939, Wash. Acad. Sci. Jour. 29 (9) : 390, fig. 24 



(larvae) ; Belkin, 1940, Ent. News 51: 193. 

 Amphicerus gracilis Casey, 1898, N. Y. Ent. Soc. Jour. 6 : 68-69 ; Lesne, 1938, in 



Junk (pub.), Coleopt. Cat, pt. 161, p. 41; Brimley, 1938, Insects of North 



Carolina, p. 197. (New synonymy.) 

 Apate serricollis Germar, 1824, Insectorum Species Novae, v. 1, p. 464 ; Chevrolat, 



1861, Soc. Ent. de France (ser. 4)1: 392. 

 Apate aspericollis Germar, 1824, Insectorum Species Novae, v. 1, p. 465. 



Citations to the literature are not complete ; only the more important 

 ones have been given. 



Male. — Elongate, cylindrical, uniformly reddish brown to brownish 

 black, the antennae, palpi, and legs slightly paler; dorsal surface of 

 body sparsely clothed with short, recumbent, yellowish hairs. 



Head much narrower than pronotum, transversely flattened behind 

 eyes, smooth at middle of flattened area, finely, irregularly granulose, 

 with a few larger granules and dense, long, erect hairs on front and 

 clypeus, and with short, longitudinal, parallel carinae on occiput; 

 clypeal suture slightly indicated, sometimes obsolete at sides ; labrum 

 finely, densely punctate; first segment of antennal club quadrate. 



Pronotum quadrate, arcuately emarginate in front, widest at mid- 

 dle, strongly deflexed anteriorly ; sides broadly rounded, produced into 

 a short, unciform horn at apical angles ; surface densely, coarsely im- 

 bricate-punctate on basal half, densely, coarsely tuberculate on apical 

 half, the tubercles broad, semierect, and rasplike, with four large rasp- 





