NORTH AMERICAN BOSTRICHIDAE 57 



Genus SINOXYLON Duftschmid 



Sinoxylon Duftschmid, 1825, Fauna Austriae, v. 3, pp. 85-86; Redtenbacher, 1845, 

 Gattungen Deut. Kaefer Fauna, p. 94; 1847-1849, Fauna Austriaca, Kafer, 

 pp. 35, 354; Lacordalre. 1857, Genera des Coleopt, v. 4, pp. 534, 538; Jacquelin- 

 Duval, 1859-1863, Genera Coleopt. Europe, v. 3, pp. 229, 233, pi. 56, fig. 277; 

 LeConte, 1861, Smithsn. Inst. Misc. Collect. 3 (1) : 207; Redtenbacher, 1874, 

 Fauna Austriaca, Kafer, ed. 3, v. 1, p. XCII, vol. 2, p. 65 ; Kiesenwetter, 1877, 

 in Erichson, Naturgesch. Insect. Deut. Coleopt., v. 5, pt. 1, pp. 31-34 ; Seidlitz, 

 1889, Fauna Transylvanica, Kaefer, p. 116, 529; 1889, Fauna Baltica, Kaefer, 

 pp. 116, 495; Zoufal, 1894, Wien. Ent. Ztg. 13: 34, 37-38: Schilsky, 1899, in 

 Kiister and Kraatz, Kafer Europas, 36 : pp. UU, YY-ZZ ; Lesne, 1901, Abeille 

 30: 110-118; Csiki, 1903, Roy. Lapok. 10: 17, 20; Lesne, 1906, Soc. Ent. de 

 France Ann. 75 : 447, 462-545 ; Reitter, 1911, Fauna Germanica, v. 3, pp. 302, 

 305 ; Jakobson, 1913, Kiifer Russland, pt. 10, pp. 805, 807 ; Lesne, 1924, Bostry- 

 chides de l'Afrique Tropicale Franchise, pp. 115, 176-199; 1938, in Junk 

 (pub.), Coleopt. Cat., pt. 161, pp. 48-54; 1939, Soc. Zool. de France, Bui. 73: 

 404-415, figs. 



Apatodes Blackburn, 1889, Linn. Soc. N. S. Wales, Proc. (1898), ser. 2, 3: 1429. 



Trypocladus Guerin-Meneville, 1845, Soc. Ent. de France Ann. (ser. 2) 3: 

 Bui., p. XVII. 



Head strongly convex, not transversely depressed behind eyes, 

 deeply inserted in prothorax, not visible from above ; clypens strongly 

 transverse, flat, truncate or sinuate in front, with a small tooth on 

 each side at base of labrum ; labrum transverse, broadly rounded, and 

 densely ciliate with long, yellow hairs in front; mandibles very short, 

 broad and truncate at apices; eyes small, oval, subglobose, strongly 

 projecting. Antenna short, 10-segmented; first and second segments 

 robust, elongate, second shorter than first ; third to seventh segments 

 very short, compact, transverse, narrower than second segment, sub- 

 equal in length to one another; last three segments forming a loose, 

 compressed, strongly transA^erse or flabellate club, with or without dis- 

 tinct sensory depressions on each surface. Pronotum strongly con- 

 vex, truncate or arcuately emarginate in front, arcuately emarginate 

 at base, dentate anteriorly, not transversely depressed behind anterior 

 margin; sides not margined. Scutellum small, quadrate or triangu- 

 lar. Elytra strongly convex, tuberculate on apical declivity. Legs 

 short, subequal in length ; tibiae expanded toward apices, each with a 

 large, arcuate spine at apex, the anterior and middle pairs dentate on 

 exterior margins; posterior tarsi as long as, or longer than tibiae, 

 apical segment of each shorter than preceding four segments united. 

 Anterior coxae contiguous. Middle coxae narrowly separated. Pos- 

 terior coxal cavities completely margined on first visible abdominal 

 sternite. Intercoxal process of abdomen tabular or triangular. Body 

 short or elongate, cylindrical. 



Genotype. — Of Sinoxylon, Sinodendron muricatum Fabricius. 

 (Monobasic.) Of Apatodes, Apatodes maoleayi Blackburn. 

 (Monobasic.) Of Trypocladm, Bostrichus sexdentatum Olivier. 

 (Present designation.) 



This genus contains at least 50 described species, which are distrib- 

 uted throughout Southern and Central Europe, Asia, Africa, Aus- 

 tralia, Japan, and Malasia. Some of the species have been carried in 

 commerce to other parts of the world. Five of the species have been 

 intercepted at various times in the United States, but so far as known 

 have not become established. 



