16 MISC. PUBLICATION 698, U. S. DEPT. OF AGRICULTURE 



triangular. Elytra elongate, convex or subdepressed, parallel or 

 slightly expanded posteriorly, without longitudinal carinae on apical 

 declivity. Legs long and slender; anterior tibia not emarginate at 

 base, coarsely dentate on outer margin, without a large arcuate spine at 

 apex but with three spines at apex, two short straight ones on inner 

 margin, and a short, obtuse one on outer margin ; tarsi 5-segmented ; 

 posterior pair as long as or longer than tibiae, first segment not dis- 

 tinct; last segment of each shorter than preceding four segments 

 united ; second and third segments of anterior pair slender, not or only 

 slightly expanded on apical halves. Anterior co::ae very narrowly 

 separated by a short prosternal process ; middle coxae very narrowly 

 separated. Bodv elongate, cylindrical. 



Genotype. — Of Psoa, viennensis Herbst. (Monobasic.) Of Acre- 

 pis, maculata Le Conte. (Monobasic.) 



This genus contains four described species, two from Europe and 

 two from the United States. 



Herbst (1797) erected Psoa for his new species, viennensis, from 

 Austria. LeConte (1852) erected the genus Acrepis for a single speci- 

 men he collected at San Francisco, Calif., which he named maculata. 

 In 1861 LeConte stated that this type was lost at sea, while on the way 

 to Europe for examination by Lacordaire, and that he was unable to 

 determine the differences between Acrepis and Psoa, but it was quite 

 possible that Acrepis should be united either with Psoa or Exopioides. 

 Horn (1878) stated that on the basis of the material before him Acre- 

 pis should be suppressed as a synonym of Psoa. 



KEY TO THE SPECIES OF PSOA 



Pronotum wider than long, usually widest at middle, subopaque, and densely 

 punctate; sides broadly rounded maculata (LeConte), p. 16. 



Pronotum not wider than long, widest along apical half, strongly shining, 

 and rather sparsely punctate; sides usually more strongly converging 

 posteriorly quadrisignata (Horn) , p. 17. 



Psoa maculata (LeConte) 



Acrepis maculata LeConte, 1852, N. Y. Lye. Nat. Hist. Ann. 5 : 213. 



Psoa maculata Horn, 1878, Amer. Phil. Soc. Proc. 17: 554, 555; 1886, Amer. Ent. 



Soc. Proc. 13: pp. xv-xvi, fig. 1; Coquillett, 1892, Insect Life 4: 261; Lesne, 



1896. Soc. Ent. de France Ann. 65 : 99, 100-101, fig. 1A ; Lintner, 1896, N. Y. 



State Mus. Rpt. 49 (1895), p. 268: Fall, 1901, Calif. Acad. Sci. Occas. Papers, 



No. 8 : 25, 134 ; Lesne, 1912, Paris Mus. d'Hist. Nat. Bui. 18 : 404-409 ; 1913, ibid. 



19: 271-275; 1938 in Junk (pub.), Coleopt. Cat., pt. 161, p. 30; Anderson, 1939, 



Wash. Acad. Sci. Jour. 29 : 390, figs. 14, 17 (larvae) . 

 Psoa (Acrepis) cleroides Lesne, 1913, Paris Mus. d'Hist. Nat. Bui. 19: 273-275, 



figs. 2-3: 1938, in Junk (pub.), Coleopt. Cat., pt. 161, p. 29; Belkin, 1940, Ent. 



News 51 : 193. 



Male. — Elongate, cylindrical ; head and pronotum black, with a dis- 

 tinct purplish or greenish tinge ; elytra bluish or greenish black, with 

 variable shaped yellow markings, rarely without yellowish markings : 

 beneath bluish, purplish, or greenish black, the posterior margins of 

 abdominal sternites yellowish, and the antennae, tarsi, and palpi red- 

 dish brown. 



Head in front narrower than pronotum, moderately flattened, 

 coarsely, uniformly, confluently punctuate, rather densely clothed with 

 long and short, fine, erect hairs. 



Pronotum slightly wider than long, widest near middle, moderately 

 convex; sides broadly, arcuately rounded, sometimes more strongly 



