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



any explanation, perhaps on the above suggestion by Horn. Prior 

 authors, Olivier, 6 Fabricius, 7 andHerbst 8 all cite Fabricius (1787) and 

 give the habitat as Saxony. After these dates no mention was made 

 of hamatus until Horn (1878) cited it as synonymous with bicaudatus, 

 and was followed by Lesne (1899). Other than the type locality, no 

 European record of hamatus has been published, and use of this name 

 for the North American species seems unwise until the type can be 

 critically restudied. 



Germar (1824) described serricollis {$) and aspericollis ( $ ), both 

 from Kentucky, but both species have been placed as synonyms of 

 bicaudatus. Casey (1898) based his description of gracilis on four 

 specimens from Kansas, Iowa, and North Carolina, but after studying 

 these types, the writer is unable to separate gracilis from bicaudatus. 



In this species the normal number of segments in the antenna is 10, 

 with a 3-segmented club, but the number of segments is variable. 

 The antenna is composed of either 8, 9, or 10 segments, in which case 

 the club is either 1-, 2-, or 3-segmented, and sometimes the number of 

 segments varies on the two antennae. 



Amphicerus (Amphicerus) cornutus (Pallas) 



Ligniperda comuta Pallas, 1772, Spicilegia Zoologica, v. 1, pt. 9, p. 8, pi. 1, fig. 4. 



Bostrijchus cornutus Lesne, 1896, Soc. Ent. de France Bui., p. 334. 



Schistoceros cornutus Lesne, 1899, Soc. Ent. de France Ann. (1898), 67: 506, 



510-513, figs. 105, 110-113, 115 ; 1910, Paris Mus. d'Hist. Nat. Bui. 16 : 185-186. 

 Amphicerus cornutus Lesne, 1938, in Junk (pub.), Coleopt. Cat., pt. 161, pp. 40-41 ; 



1939, Rev. Frang. Ent. 6 : 91, 97 ; Anderson, 1939, Wash. Acad. Sci. Jour. 29 



(9) : 390, figs. 23, 29, 34 (larvae) ; Briinley, 1938, Insects of North Carolina, p. 



197 ; Belkin, 1940, Ent. News 51 : 193. 

 Ligniperda (?) bicornutus Latreille, 1833, Voy. Humboldt, v. 2, p. 65, pi. 34, fig. 



6 (publication not available). 

 Apate punctipennis LeConte, 1858, Acad. Nat. Sci. Phila. Proc. 10 : 73 ; Gorhaui, 



1883, Biol. Centr-Amer., Coleopt. 3 (2) : 213 ; Herbert, 1920, Jour. Econ. Ent. 13 : 



361. 

 Amphicerus punctipennis Horn, 1878, Amer. Phil. Soc. Proc. 17 : 547 ; Hubbard, 



1888, Ent. Amer. 4 : 95-96 ; Coquillett, 1892, Insect Life 4 : 261 ; Casey, 1898, 



N. Y. Ent. Soc. Jour. 6: 68; Marlatt, 1898, U. S. Dept. Agr. Farmers' Bui. 70, 



p. 12. 

 Bostrichus peregrinus Erichson, 1847, in Wiegmann's Arch. f. Naturgesch. 13 



(1) : 87. 

 Schistocet'os peregrinus Lesne, 1899, Soc. Ent. de France Ann. (1898) 67: 



620-621. 

 Bostrichus migrator Sharp, 1885, Roy. Dublin Soc. Sci. Trans, (ser. 2) 3:160- 



161 ; Gorham, 1886, Biol. Centr.-Amer., Coleopt. 3, pt. 2 : 352. 

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



Junk (pub.), Coleopt. Cat, pt. 161, p. 41. (New synonymy.) 



Male. — Elongate, cylindrical, uniformly brownish black, the anten- 

 nae and palpi reddish brown. 



Head much narrower than pronotum, transversely concave behind 

 eyes, finely granulose and rugose, densely clothed with long, semierect, 

 yellowish hairs, and with two small tubercles at middle behind clypeus, 

 smooth and shining at middle of transverse concave area, and with 

 short, longitudinal, parallel carinae on occiput ; clypeus coarsely punc- 

 tate, finely, sparsely granulose; clypeal suture deeply impressed at 



6 Olivier, A. G. encyclopedie methodique, insectos, v. 5, p. 108, 1790. 



7 FABRICIUS, J. C. ENTOMOLOGICA SYSTEMATICA, V. 1, pt. 2, pp. 360-361, 1792; 

 SYSTEMA ELUTHERATORUM, V. 2, pp. 380-381, 1801. 



8 Herbst, N. M. natursystem insekten, Kafer, v. 5, p. 73, 1793. 



