544 SUBFAMILY XII. COSSONIN.E. 



joints of funicle transverse, closely united, club gradually 

 formed ; seventh and eighth elytral stria? united behind the 

 humerus. Van Dyke (1915) has pointed out that in many cases 

 they accompany species of Cossonus. R. orcc/oncnsis living more 

 or less in company with C. crenatns, though generally preferring 

 the dryer parts of the tree; R. pollens with C. lupina, and R. 

 bmnnwis with C. piniplrilits. LeConte (1870, 340) has noted the 

 resemblance these species bear to certain Scolytida? (Hi/lastes), 

 and the strong actual approximation, as indicated by the short- 

 ened beak, number of funicular joints, etc. 



KEY TO EASTERN SPECIES OF RIIYNCOLUS. 



a. Funicle of antennae very stout, second joint apparently very short, 

 enclosed in apical cavity of first; joints 2 7 strongly transverse; 

 elytral stria? deep, their punctures coarse and serrate. 



854. OREGONENSIS. 



aa. Funicle moderately stout, second joint at least as long as third, joints 



2 7 moderately transverse; elytra feebly striate. 



6. Beak with median groove; elytral intervals feebly convex, not cari- 

 nate; first ventral segment coarsely and densely punctate. 



855. BRUNNEUS. 



66. Beak not grooved; intervals finely and sharply carinate; first ven- 

 tral finely and sparsely punctate. 85G. CARINATUS. 



854 (9043). RHYNCOLUS OREGONENSIS Horn, 1873, 445. 



Subcylindrical. Black, shining; legs and antenna? dark reddish-brown, 

 dub paler. Beak not longer than head, as wide as long, densely punctured 

 and usually with a small median smooth space. Thorax slightly longer 

 than wide, feebly but distinctly constricted near apex; sides vsry slightly 

 curved, more strongly near base which is slightly narrower than apex; 

 disc rather coarsely, evenly and confluently punctate. Elytra scarcely 

 wider than thorax, sides parallel, the apex obtusely rounded; striae as in 

 key; intervals narrow, convex or subcarinate, each with a row of minute, 

 very remote punctures. Under surface rather coarsely, deeply and densely 

 punctate. Length 2.8 3.5 mm. 



Marion County, Ind., rare; Nov. IT. Anglesea, N. J. Sanford 

 and Dunedin, Florida; Jan. 1 April 11, beneath bark of dying- 

 pine and by beating in wet hammock. Ranges from New Jersey 

 to Michigan, Oregon and California, south to Florida. The 

 Florida specimens are somewhat shorter and more slender than 

 those from Indiana, and two of the four have a narrow smooth 

 space at middle of thorax, but other appreciable differences are 

 absent. They probably represent what Casey (1892, 707) has de- 

 scribed as fliscors, as the characters shown in his description 

 differ very slightly if at all from those of orecjonensis as described 

 bv Horn. 



