NORTH AMERICAN BOSTRICHIDAE 6 



Subfamily DYSIDINAE 



Dysididae Lesne, 1921, Assoc. Franc, pour l'Avanc. des Sci., Cong, de Strasbourg 



(1920), p. 286. 

 Dysidinae Lesne, 1938, in Junk (pub.), Coleopt. Cat, pt. 161, p. 4. 

 Apoleoninae Gardner, 1933, Indian Forest Rec, Ent. Ser. 18 (9) : 3 (larvae). 



This subfamily contains but two genera, Dysides Perty and Apoleon 

 Gorham, the former distributed throughout South America and the 

 latter restricted to the oriental regions. 



Genus DYSIDES Perty 



Dysides Perty, 1S32. Delectus Animalium Articulatorum Ins. Brasil, p. 113, pi. 

 22, fig. 14 ; Silbermann, 1833, Rev. d'Ent. 1 : 265 ; Westwood, 1835, Mag. Zool., CI. 

 9, pi. 123 ; Guerin-Meneville, 1844, Icon. Regne Anim., v. 3, Insectes p. 188 ; 1845, 

 Soc. Ent. de France Ann. (ser. 2) 3: Bui. p. xvii; Lacordaire, 1857, Genera des 

 Coleopt., v. 4, pp. 519, 527-528; Lesne, 1894, Soc. Ent. de France Ann. 63: 

 18-21 ; 1938, in Junk (pub.), Coleopt. Cat., pt. 161, p. 4. 



Head strongly convex, not covered by the prothorax, completely 

 visible from above, the front prolonged forward forming a lobe on 

 each side of clypeus ; clypeus strongly transverse, emarginate in front ; 

 labrum small, partially covered by clypeus ; maxillary and labial palpi 

 subequal to each other in length, apical segments of maxillary palpi 

 broad, elongate, broadly rounded or subtruncate at apices, apical seg- 

 ments of labial palpi narrowly oblong, rather acute at apices ; mandi- 

 bles large, robust, acute at apices, bidentate on inner margins, densely 

 pubescent posteriorly; eyes large, round, globose, strongly projecting. 

 Antenna 9-segmented ; first segment robust, elongate, sides nearly par- 

 allel, densely clothed with stiff hairs; second segment narrow, ex- 

 panded toward apex, subequal in length to the following two segments 

 united; third to sixth segments round, subequal in length; last three 

 segments forming a large, loose club, with numerous small sensory 

 depressions on each surface, and with a few erect blackish hairs. Pro- 

 notum moderately convex, uneven and irregularly tuberculate on top, 

 truncate at base, truncate or broadly, arcuately emarginate at apex, 

 without distinct lateral margins. Scutellum subtriangular, elongate, 

 broadly rounded at apex. Elytra moderately convex, without longi- 

 tudinal carinae. Legs long, subequal in length; tibiae with sides 

 nearly parallel, not distinctly dentate on exterior margins, anterior 

 pair with three spines at apices, a small, arcuate one on outer margin 

 and two unequal ones on inner margin; tarsi 5-segmented; posterior 

 pair shorter than tibiae, last segment subequal in length or slightly 

 longer than first. Anterior coxae contiguous. Middle coxae narrowly 

 separated. Intercoxal process of abdomen broadly triangular. Body 

 elongate, moderately depressed. 



Genotype. — Dysides obscurus Perty. (Monobasic.) 



The genus Dysides was founded by Perty (1832) for his new species 

 obscurus from Brazil. 



There is considerable discussion on the systematic position of this 

 genus. Perty placed it with some doubt between the "Ptiniors" and 

 "Clerides." Silbermann (1833) placed it in the Anobiidae near 

 Anobium, stating that the tarsi have five segments, but the antennae 

 have only nine segments. Westwood (1835) placed it near Apate 

 and Psoa. Guerin-Meneville (1844) placed it in Bostrichidae near 

 Psoa and Heterarthron. Lacordaire (1857) placed it near the end of 

 the Anobiidae close to the Bostrichidae. Lesne (1921) erected the 



