658 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 56. 



flattened tubercle. The forelegs are about three-quarters the length 

 of body. Femur three and one-half times as long as wide, about 

 one-fifth longer than tarsus; tibia one-fifth longer than patella, which 

 is two- thirds again as long as trochanter. Relative lengths of joints 

 as follows: Trochanter, 9; femur, 33; patella, 15; tibia, 18; tarsus, 27. 

 Tip of tarsus with empodial claw, which is strongly bent below its 

 middle, and with distal two-thirds cleft into six equal spurs arranged 

 in pairs. The usual series of four tenent hairs arise from the ony- 

 chium at the sides of the empodial claw base. Collar trachea scythe- 

 shaped, extends backward and downward, then bends sharply up- 

 ward, of rather even caliber throughout. Penis (see pi. 79, fig. 12) 

 nearest that of T. himaculatus but very distinct in the nature of the 

 barb; uiner lobe slender, horn-like; basilar lobe projecting dorsally as 

 a cone-shaped process; shaft not very stout, but somewhat thicker 

 than inner lobe, bent upward to form an angle of about 90°; hook 

 bearing a barb that is produced posteriorly into a spur nearly as long 

 as the hook (see pi. 4). 



Type.— C&t. No. 22292, U.S.N.M. 



The type material is from Portland, Oregon, September 2, 1915, 

 from mock orange {PMlacMphus gordonuinus) , from Vicia, species, 

 and from wild current (Rihes, species) , and on chinaberry from Tracey, 

 California, September 12, 1915, collected by the author. The species 

 is nearest T. himaculatus, from Avhich it differs chiefly in the structure 

 of the penis and of the collar trachea. 



TETRANYCHUS BOREALIS Ewing. 



Plate 79, fig. 9. 

 Tetranychus borealis Ewing, 1913, Ann. Ent. Soc. Amer., vol. fi, p. 457. 



In the original publication Ewing (15) states that the female is 

 "similar to the female of T. teJarius Linn., but smaller, and never 

 orange or red. The inner prongs of the tarsal claw are stouter than 

 the inner prongs of the tarsal claw of T. tdarius Linn." Regarding 

 the male he states it is ' 'similar to the male of T. telarius Linn., except 

 for penis. Penis long, straight. Inner lobe about equal to basilar 

 lobe in length. Shaft shaped like a slender rod. Basilar lobe very 

 pronoimced, cone-shaped, equal to about one-fourth the length of the 

 shaft. Hook absent. Barb knob-like." (See pi. 79, fig. 9.) 



Ewing's type material was from Spirea species, from the Coast 

 Range Mountains, Benton County, Oregon. Ewing states that this 

 species is very closely related to T. Jiavus Ewing, but on account of 

 the marked difference in the character of the empodial claws, and 

 of the penis, the writer is of the opinion that the two species are rather 

 widely separated. 



