NORTH AMERICAN BOSTRICHIDAE 15 



LeConte (1866) described both punctatus and pubescens from Lower 

 California, and Horn (1878) placed pubescens in synonymy as the 

 female of punctatus. 



Tribe Psoini 



Psoini LeConte, 1861, Smithsn, Inst. Misc. Collect. 3 (1) : 207, 208 (part) ; 



Kiesenwetter, 1877, in Erichson, Naturgesch. Insect. Deut. Coleopt., v. 5, pt. 1, 



pp. 7-11; Schilsky, 1899, in Kiister and Kraatz, Kafer Europas 36: p. ss ; 



LeConte and Horn, 1883, Smithsn. Inst. Misc. Collect. 507: 227, 228-229 (part) ; 



Lesne, 1901, Abeille 30 : 73. 74-77 : 1921, Assoc. Franc, pour l'Avanc. des Sci., 



Cong, de Strasbourg (1920), p. 288; 1938, in Junk (pub.), Coleopt. Cat., pt. 



161, pp. 29-31. 

 Psoina Jakobson, 1913, Kafer Russland, pt. 10, pp. 801-802. 

 Psoinae Lesne, 1896, Soc. Ent. de France Ann. 65 : 96, 97-110 ; Anderson, 1939, 



Wash. Acad. Sci. Jour. 29:388-390 (larvae) (part). 

 Psoidae Boring and Craighead, 1931, Ent. Amer. (n. ser.) 11: 62, pi. 102, figs. 



A-E (larvae) (part). 



This tribe contains five genera, of which Psoa is the only one found 

 in the United States. 



Genus PSOA Herbst 



Psoa Herbst, 1797, Natursystem Insekten, Kafer, v. 7, pp. 214-215 ; Redtenbacher, 

 1845, Gattungen Deut. Kaefer Fauna, p. 94; Guerin-Meneville 1845, Soc. Ent. 

 de France (ser. 2) 3: Bui. p. xvii ; Redtenbacher, 1847-1849, Fauna Austriaca, 

 Die Kafer, pp. 35, 355 ; Blanchard, 1851, in Gay, Hist. Chile, v. 5, pp. 436-437 ; 

 Lacordaire, 1857, Genera des Coleopt., v. 4, pp. 534, 536-537; Redtenbacher, 

 1858, Fauna Austriaca, Die Kafer, ed. 2, pp. CI, 570-571; Jacquelin-Duval, 

 1859-1863. Genera Coleopt. Europe, v. 3, pp. 232-233, pi. 57, fig. 282a ; Kiesen- 

 wetter, 1877, in Erichson, Naturgesch. Insect. Deut. Coleopt., v. 5, pt. 1, pp. 7-9, 

 fig. ; LeConte and Horn, 1883, Smithsn. Inst. Misc. Collect. 507 : 228 ; Seidlitz, 

 1889, Fauna Baltica, Kaefer, ed. 2, p. 116 ; 1889, Fauna Transsylvanica, Kaefer, 

 pp. 116, 529 ; Zoufal, 1894, Wien. Ent. Ztg. 13 : 33-34 ; Lesne, 1896, Soc. Ent. de 

 France Ann. 65: 97, 98-104; Schilsky, 1899, in Kiister and Kraatz, Kafer 

 Europas, v. 36, pp. ss, ww ; Lesne, 1901, Abeille 30 : 74-76 ; Reitter, 1911, Fauna 

 Germanica, v. 3, p. 300 ; Lesne, 1912, Paris Mus. d'Hist. Nat. Bui. 18 : 404-409, 

 figs. ; Jakobson, 1913, Kafer Russland, v. 10, pp. 801, 802 ; Lesne, 1913, Paris 

 Mus. d'Hist. Nat. Bui. 19: 271-275, figs. 1-3; 1938, in Junk (pub.), Coleopt. 

 Cat., pt. 161, pp. 29-30. 



Acrepis LeConte, 1852, N. Y. Lye. Nat. Hist. Ann. 5: 213; 1861, Smithsn. 

 Inst. Misc. Collect. 3 (1) : 208; Horn, 1878, Amer. Phil. Soc. Proc. 17: 554; 

 1886, Amer. Ent. Soc. Proc. 13: xv-xvi, figs. 1-2; Lesne, 1896, Soc. Ent. de 

 France Ann. 65 : 99 ; 1912, Paris Mus. d'Hist. Nat. Bui. 18: 408; 1913, Bui. 19: 

 271. 



Head slightly flattened, not covered by prothorax, completely vis- 

 ible from above; clypeus not distinctly separated from front of head 

 in American species, vaguely, broadly rounded or subtruncate in 

 front; labrum small, indistinct, nearly covered by clypeus; mentum 

 small, transverse, subtruncate in front; maxillary palpi longer than 

 labial palpi, apical segment of each palpus subequal in length to pre- 

 ceding segment, but broader, oblong, and truncate at apex; labial 

 palpi short, apical segment of each palpus as long as preceding two 

 segments united, subtruncate at apex; mandibles short, robust, sym- 

 metrical; eyes round or oblong, globose, strongly projecting. An- 

 tenna longer than head, 10-segmented ; first segment robust, obconical, 

 longer than second; second small, oval; third to seventh short, sub- 

 equal in length ; last three segments forming a loose club, the segments 

 subglobose, eighth subtriangular, ninth and tenth oval. Pronotum 

 moderately convex, vaguely emarginate at apex, truncate at base. 

 without gibbosities or dentiform tubercles, and without distinct lateral 

 margins; sides obliquely deflexed, flattened. Scutellum small, sub- 



