NORTH AMERICAN BOSTRICHIDAE 13 



the anterior tibia not excavated or arcuate at the base, the sides of the 

 pronotum convex, and the elytra without carinae or tubercles on the 

 apical declivity, and with Melalgws in having the body cylindrical, 

 the second and third tarsal segments securiform, and the elytra of 

 the male incised and bidentate at the apex. 



Polycaon stoutii (LeConte) 



Alloeocnemis stoutii LeConte, 1853, Acad. Nat. Sci. Phila. Proc. 6: 233. 



Exops stoutii LeConte, 1857, Explorations and Survey Pacific R. It., Rpt. 12 



(2), p. 19. 

 Polyeaon stoutii Horn, 1878, Amer. Phil. Soc. Proc. 17: 552-553; Lesne, 1896, 



Soc. Ent. de France Ann. 65 : 112, 113, pi. 9, fig:. 16 ; Fall, 1901, Calif. Acad. Sci. 



Occas. Papers 8 : 25, 134 ; Herbert, 1920, Jour. Econ. Ent. 13 : 361 ; Tanner, 1927, 



Amer. Ent. Soc. Trans. 53: 14, 31, figs. 147, 148 (female genitalia) ; Boving 



and Craighead, 1931, Ent. Amer. (n. ser.) 11: 62, pi. 102, figs. B-E (larvae) ; 



Lesne, 1938, in Junk (pub.), Coleopt. Cat., pt. 161. p. 27; Anderson, 1939, Wash. 



Acad. Sci. Jour. 29 : 390, figs. 12, 13, 15, 16 (larvae). 

 Exops ovicollis LeConte, 1857, Explorations and Survey Pacific R. R., Rpt. 12 



(2), pp. 19, 49, pi. 1, fig. 19 ; Horn, 1S7S, Amer. Phil. Soc. Proc. 17 : 552. 



Male. — Elongate, moderately depressed, uniformly black, antennae, 

 palpi, and sometimes tarsi reddish brown. 



Head in front subequal in width to pronotum at apical fourth, 

 broadly, transversely depressed behind eyes, shining, coarsely, densely 

 granulose, the granules round and flat, sparsely clothed with rather 

 short, inconspicuous, recumbent hairs, with a few long, erect hairs 

 intermixed; clypeus broadly concave at middle, deeply, arcuately 

 emarginate in front. Antenna 11-segmented, with a few semierect 

 hairs; third segment distinctly shorter than fourth; funicle longer 

 than club. 



Pronotum widest near apical fourth, with a narrow median line, 

 and a large triangular flattened, median space along anterior margin : 

 sides broadly rounded anteriorly, obliquely narrowed posteriorlv ; 

 surface moderately shining, finely, densely punctate at middle, finely, 

 densely granulose at sides, sparsely clothed with short, inconspicuous, 

 recumbent hairs, with a few long, erect hairs intermixed. 



Elytra at base slightly wider than pronotum at apical fourth, 

 arcuately declivous posteriorly: sides parallel, broadly conjointly 

 rounded at apices : surface moderately shining, finely, densely punctate, 

 finely reticulate, sparsely clothed with very short, inconspicuous, 

 recumbent hairs. 



Body beneath rather densely clothed with long, fine, erect hairs, 

 which are shorter and more recumbent on abdomen : prosternum 

 coarsely granulose or rugose : abdomen finely, densely punctate. 



Female. — Differs from the male in having the head narrower than 

 pronotum, subopacuie. more finely, confluently granulose, and not 

 depressed behind the eyes, the clypeus obsoletely concave at middle 

 and feebly emarginate in front, the pronotum subopaque, more finely, 

 densely granulose and more densely punctate at middle, and the elytra 

 subopaque and finely granulose at base. 



Length 10-24 mm., width 3-6.5 mm. 



Type locality. — Of stoutii and ovicollix. San Francisco, Calif. ; types 

 in the LeConte Collection in the Museum of Comparative Zoology, 

 Cambridge, Mass. 



