Bark Beetles of the Genus Hylastes Erichson in North America, Volumes 415-422
The genus Hylastes Erichson occurs throughout the continent of North America from Alaska and Central America and from the Atlantic coast to the Pacific coast. This publication is concerned with the forms found north of Mexico. Coniferous forests in every region of the United States contain one or several species of Hylastes. Most of the species of the genus favor the pines as hosts, but some spruces are also attacked, as well as Douglas fir and to a less extent the true firs.
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allotype Amer Antenna appressed arcuate transverse impression arcuately narrowed Branch Bul brightly shining broadly impressed broadly rounded front Canada Dept Chapuis closely punctured coarser Columbia Falls Eichhoff and Schwarz epistoma Erichson Eye finely granulate female finely punctured front of middle frontal rectangle glabrous gracilis hairs Holotype Hylastes inconspicuous inner margin entire interspaces wider last abdominal sternite last sternite Leconte long as wide median carina median line moderately convex moderately narrow narrower than elytra narrowly rounded nigrinus ninth interspace paratype Phil Pinus ponderosa porculus posterior angles rounded posterior outline feebly posterior two-thirds Prineville Proc Prons pubescence punctures of moderate roughly punctured rounded front margin rugose salebrosus sculpture segment of club short sides nearly straight sides subparallel slightly wider species specimens straight and subparallel strial punctures strongly convex surface moderately shining surface shining surface subopaque Swaine synonymy tenuis Trans twice as long vestiture wider than pronotum wider than striae widest