XORTH AMERICAN BOSTRICHIDAE O 



Distribution, — This species is recorded in the literature from Vene- 

 zuela. Brazil. Bolivia, and Guiana. 



So far as known this species has not become established in the 

 United States, but adults have been intercepted at Hoboken, N. J., 

 with orchids from Venezuela and in a softwood hoard from Colombia. 

 South America. Nothing is known about the habits of this species, 

 but D'Orbigny reported collecting adult- on a dead tree at Guarayos, 

 Bolivia, during December. Westwood (1835) recorded a specimen 

 in the Guilding collection from Saint Vincent Island, but the locality 

 is somewhat doubtful. 



Subfamily PSOINAE 



Tribe POLYCAONINI 



Polycaonini Leslie, 1921, Assoc. Franc, pour l'Avaiic. d : s Sci., Cong, de Stras- 

 bourg (1920), p. 287. 



Polycaoninae Leslie. 1896. Soc. Ent. de France Ann. 65: 9C, 111-125. 



Psoini LeConte, 1861, Smithsn. Inst. Misc. Collect. 3 (1) : 207, 208 < parti : Horn, 

 1878, Anier. Phil. Soc. Proc. 17: 540, 551 (parti: LeConte and Horn. 1883, 

 Smithsn. Inst. Misc. Collect. 507: 227 (parti. 



Psoidae Boring and Craighead, 1931, Ent. Anier. (n. s.) 11: 62 (part) (larvae). 



Psoinae Gardner, 1933, Indian Forest Rec. Ent. Ser. 18 (9) : 3, 4 (larvae) : An- 

 derson, 1939, Wash. Acad. Sci. Jour. 29: 388-390 (part). 



This tribe contains two genera, both of which are represented in 



the United States. 



KEY TO THE GEXERA OF POLYCAONINI 



Anterior tibia strongly emarginate at base; sides of pronotum 

 flattened Melalgus Dejean, p. 5. 



Anterior tibia not emarginate at base; sides of pronotum con- 

 vex Polycaon Castelnau, p. 11. 



Genus MELALGUS Dejean 



Melalgus Dejean, 1835, Cat. Coleopt, ed. 2, p. 309; 1836. ed. 3 rev., p. 334: Sturm. 



1843. Cat. Kiifer Sammlung. p. 231. 

 Heterarthron Dejean. 1836, Cat. Coleopt.. ed. 3 rev., p. 334; Guerin-Meneville, 



1884. Icon. Regne Anim. Ins., v. 3, pp. 186-187; 1845, Soc. Ent. da France Ann. 



(ser. 2) 3: Bui., p. xvii : Lesne, 1895, Soc Ent. de France Ann. 64: 169, note 



2; 1S96. 65: 111. 114-125: 1906, 75: 394-31-9: 1925, Encyc. Fur. (ser. B). 



Coleopt. 1 : 31 : 1938, in Junk (pub.), Coleopt., Cat., pt. 161, i p. 27-29; Belkin, 



1940. Ent. News 51 : 193. 

 Exopioides Guerin-Meneville. 18S4, Icon. Regne Anim. Ins.. v. 3. pp. 187-188; 



1845. Soc. Ent. de France Ann. (ser. 2) 3: Bui. p. xvii; Horn. 1878, Anier. 



Phil. Soc. Proc. 17 : 551, 554 : Lesne, 1896, Soc. Ent. de France Ann. 65 : 111, 114 : 



1913, Soc. Ent. de France Bui., p. 194. 

 Polycaon Horn. 1878, Anier. Phil. Soc. Proc. 17: 551-54 (part). 



Head strongly convex, not covered by prothorax, completely visible 

 from above: clypeus large, broadly transverse, separated from front 

 of head by a more or less distinct suture; labrum broadly transverse, 

 partially covered by clypeus. truncate or emarginate in front : nientum 

 strongly transverse, more or less emarginate in front ; maxillary and 

 labial palpi subequal in length, densely pubescent, apical segment of 

 each narrowly oblong, rather acutely round at apex, mandibles 

 robust, asymmetrical; eyes round or oblong, globose, strongly project- 

 ing. Antenna short, 10- or 11-segmented : first segment oblong. 

 longer than second; second to seventh or eighth segments short ; last 



