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TRIBE III. CORTHYLIXI. 045 



66. Prothorax scabrous and granulate behind middle. 



1043. SCARRICOLLIS. 



1040 (9095). XYLOTERUS' POLITUS Say, 1828, 256; ibid, II, 318. 



More hairy than the other species, with elytral intervals sparsely 

 punctured, so that the rows of punctures appear confused. 

 Smaller, smoother, unicolorous. Male, hind tibiae nar- 

 rower; anterior edge crooked and near tip thickly clothed 

 with long silky hairs with incurving points; tarsus with 

 fine hairs curved at points. Female, hind tibia? broader; 

 anterior edge straight, with a few straight bristles; tarsus 

 with short straight hairs. Length 3.3 mm. (Fig. 150.) 



Ithaca, N. Y., April 26. Angora, Pa,, Mar. 20, 

 on oak, entering sap-wood near ground. (Wenzel.) 

 Eastern United States and Canada. Food plants, 

 Fig 150 v 12 Quercus, Fagus, Acer, Betula, Hicoria, Fraxiniis, 

 (Af dorio age ~ Castanea, Magnolia, Almis, Picca, Finns. Infesting 

 the sap-wood of deciduous and coniferous trees; a 

 dangerous enemy to smooth-bark trees weakened by external in- 

 jury or storm. They enter the green wood of logs, stumps, dying 

 trees and wounded places on green trees, and although they some- 

 times fail to establish their colonies, as shown in maples at Wash- 

 ington, D. C., the}' are very injurious to outer portions of wood. 

 Adults have been observed in West Virginia from March to Au- 

 gust. 



1041 (9092). XYLOTERUS RETUSUS Lee., 1868, 158. 



Cylindrical, rather stout. Blackish-brown, shining. Head of male 

 deeply concave, sparsely finely punctured, clothed with erect hairs. Protho- 

 rax much broader than long, rather quadrate in form, as broadly rounded at 

 tip as at base, convex, very strongly declivous and broadly impressed 

 near tip; asperate with transverse granulations and clothed with long 

 erect hair in front, finely, not densely punctured behind. Elytra with 

 distant rows of rather fine, not deeply impressed punctures, each with a 

 testaceous vitta, abbreviated before and behind. Female, head convex in 

 front, roughened with minute granules, and with a small depression in 

 centre; antenna? with a long bristle rising from the anterior edge of each 

 joint of funicle and first and second joints of club; also with a few long 

 hairs, all curving upward. Club of male antennae with a few short, stiff 

 hairs, no long bristles; head with longitudinal elevation in front. Length 

 4.5 mm. 



Canada, West Virginia. Food plant, the large toothed aspen, 

 Populus grandidentata Michx., entering the green sap-wood of 

 dying trees, causing large pin-holes. Adults, (West Virginia) 

 August 10. 



