NO. 10 MORPHOLOGY OF GNATllOTRICHUS — SCIIEDL II 



1922. Blackman, M. W.(5o). 



Author found it in only one locality in the Mississippi region (Ag- 

 ricultural College, loblolly pine). Otherwise it was found asso- 

 ciated with Platypus flairicornis Fabr., Ips calligraphus Germ., 

 and the clerid Thaninisimns dubius Fabr. Distribution: Eastern 

 Canada, eastern United States, as far south as Texas and Florida. 



Host trees : Pines, spruce and larch. In Mississippi, in loblolly pine. 



C. GNATHOTRICHUS RETUSUS LEG. 



1868. Leconte, J. L.(2). 



Original description : 



Cryphahis rctusus. Cylindrical, slender, blackish-brown; base of elytra 

 paler; antennae and feet yellowish; head prominent, convex, subcarinated, 

 shining, sparsely punctured ; prothorax nearly one-half longer than wide, 

 sides slightly converging from the base and feebly rounded, tip strongly 

 rounded, surface rough and sparsely hairy before the middle, granules 

 tolerably coarse near the tip, behind the middle sparsely punctulate ; elytra 

 very finely rugose and distantly punctulate in rows, and with a few long 

 hairs behind the middle, posterior declivity with a deep depression along 

 the suture, limited each side by a longitudinal obtuse elevation, bearing 

 on its liighest portion a few very fine denticulations ; suture not elevated. 

 Long. 3.5 mm. 



Collected in the coast region of California and Oregon by Doctor Horn. 

 This species has the same form and sculpture as C. matcriarius, but is 

 larger and readily distinguished by the different sculpture of the posterior 

 declivity of the elytra. 



1876. Leconte, J. L., and Horn, H. 0.(9). 

 Pityophthorus rctusus Lee. : California, Oregon, Vancouver Island. 

 Leconte doubted his formerly described sulcafus Lee. and is of 

 the opinion that this is really the male of retusus. 



1878. ElCHHOFF, W. ( I I ) . 

 Quotes Leconte's description. 



1893. Hopkins, A. D.( 17). 



Gnalhotrichus rctusus Lcc. Timbcr-bcctlcs. Enters sap-wood. Causes pin 

 holes and bluing. Infests white pine, also other pines. Adults from 

 Virginia near West Virginia line, October 21. Adults dead in white pine 

 wood, August 29. Monongalia county and Virginia. The only record of 

 rctusus in the eastern United States. 



1894. Hopkins, A. D.(2o). 



In Leconte and Horn " RyuchnpJwra of North America," the de- 

 scription of male is that of female; female description is of 

 male. Additional : Male club of antennae with a few short, 

 stiff hairs. No long bristles. Head with a longitudinal elevation 



