NORTH AMERICAN BOSTRICHIDAE 11 



Genus POLYCAON Castelnau 



PoUjcaon Castelnau. 1836. in Silberniann's Rev. d' Ent. 4: 30; Lacordaire, 1857, 

 Genera des Coleopt.. v. 4, pp. 534-535 : LeConte, 1861, Smithsn. Inst. Misc. 

 Collect. 3 (li : 208; Horn. 1878, Amer. Phil. Soc. Proc. 17: 551-554 (parti : 

 LeConte and Horn. 1883, Smithsn. Inst. Misc. Collect. 507: 228-229; L 

 1896. Soc. Ent. de France Ann. 15: 111-114: 1938. in Junk (pub.), Coleopt. 

 Cat., pt. 161. pp. 26-27 ; Belkin. 1940, Ent. News 51 : 193. 



Exops Curtis. 1839. Linn. Soc. London. Trans. 18: 203-204, pi. 15, figs. 19-20. F: 

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

 Agassiz. 1846, Noruenclator Zoologicus, pt. 11, Coleoptera. p. 71 : Blanchard, 1 851 . 

 in Gay's Hist, de Chile, v. 5. pp. 434-436 ; LeConte, 1857, Explorations and 

 Survey Pacific R. R., Rpt. 12 (2), pp. 19, 49. 



Alio eocru mis LeConte. 1853, Acad. Nat Sci. Phila. Proc. 6: 232-233; 1857, 

 Explorations and Survey Pacific R. R.. Rpt. 12 (2), pp. 19, 4!). 



Pson Erichson 1834 (not Herbst 1797 ), Nova. Acta. Acad. Leopold, v. 16. sup. 1. 

 p. 390, pi. 39, fig. 4. 



Head strongly convex, not covered by prothorax. completely visible 

 from above; clypens large, broadly transverse, separated from front 

 of head by an obsolete suture; labrnm broadly transverse, partially 

 covered by clypeus, truncate or emarginate in front ; mentum 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 rounded at apex; mandibles robust, 

 asymmetrical; eyes round, globose, strongly projecting. Antenna 

 short. 10- or 11-segmented : first segment oblong, longer than second ; 

 second to seventh or eighth segments short ; last three segments form- 

 ing a loose club, which is as long as or longer than the funicle, first 

 two segments subtriangular. last segment oblong-oval. Pronotum 

 moderately convex, truncate at base and apex, without gibbosities 

 or dentiform tubercles, lateral margins not distinct : sides convex. 

 Scutellum quadrate or slightly transverse. Elytra moderately con- 

 vex, without longitudinal carinae on apical declivity. Legs long: 

 anterior tibia not emarginate at base, strongly dentate on outer mar- 

 gin, with two spines at apices, a large arcuate one on inner margin, and 

 a short, straight one on outer margin; tarsi 5-segmented, posterior 

 pair as long as. or longer than tibiae, last segment of each shorter 

 than preceding four segments united: second and third segments of 

 anterior pair not expanded on apical halves. Anterior and middle 

 coxae separated. Body elongate, moderately depressed. 



Genotype. — Of Polycaon^ cMliensis Castelnau. (Monobasic.) Of 

 Exops, heron') Curtis. (Monobasic, synonym of chiliensis Castelnau. ) 

 Of AUoeocnemis, stoutii Leconte. (Monobasic.) 



This genus contains but four described species, three of which are 

 found in the United States and the other one in South America. 

 Castelnau (1836) erected Polycaon for chiliensis Castelnau. a new spe- 

 cies from Chile, which is a synonym of Psoa chilensis Erichson (1834) . 

 Curtis (1839) erected Exops for "b&uani Curtis, a new species from 

 Chile, and placed it in the family Cleridae. Agassiz (1846) placed 

 Exops Curtis (1839) as a synonym of Polycaon Castelnau (1836). 

 Blanchard (1851) placed Psoa Erichson (not Herbst) as a synonym 

 of Exops Curtis. LeConte (1853) erected AUoeocnemis for stoutU 

 LeConte. a new species from California. Lacordaire (1857) placed 

 Exops Curtis and AUoeocnemis LeConte as synonyms of Polycaon 

 Castelnau. Lesne (1896) placed Exops bevani Curtis as a synonym 

 of Polycoxm cMlensis Erichson. 



