October, '17] EWING: ECONOMIC MITES 499 



but only one with a perfect cornea. Palpi prominent; palpal claw very short, stout, 

 and but sUghtly hooked ; thumb swollen, short, not reaching tip of claw, and appar- 

 ently without digit. Abdomen rather strongly arched, and evenly rounded behind 

 except for the anal papilla. Above, the abdomen is sparsely clothed with long, 

 prominent, slightly curved, minutely pectinate setae. Legs moderate; tarsus of leg 

 I but slightly longer than tibia, very broad and truncate at its tip; at its tip above it 

 bears a large tactile seta much longer than the tarsus itself. The tarsi of the legs are 

 each provided distally with two subequal, simple claws, and four tenent hairs; of the 

 latter the two inner are longer than the two outer, and all are at least twice as long as 

 the claws. Length, 0.36 mm.; width, 0.23 mm. 



From Pasadena, California; on bamboo; by C. P. Clausen. Described 

 from several specimens. This species is probably an introduced one. 



Caligonus mali n. sp. 



Preserved specimens yellowish and reddish, but live ones brighter with more red. 

 Body oval, about twice as long as broad. Palpi long, reaching about the middle of 

 tarsus I; terminal segment about as long as segment next to it, and ending in a long, 

 downwardly curved, sharp, simple claw. Thumb of palpus cylindrical, slender, sur- 

 passing the claw by about one-fourth its length and bearing at its tip a prominent, 

 straight spine, 3-partite at its tip and about one-half as long as the thumb itself, and 

 just below this prominent spine a longer, curved simple seta. Chelicerse with stout 

 bases, but tapering rapidly toward the slender, sharp, needle-like distal portions. 

 Tips of chelicerse reach to the distal end of femur of palpus. Abdomen somewhat 

 pointed toward apex, sparsely clothed above with practically straight simple setae. 

 Legs moderate; anterior pair slightly longer than the others; posterior pair extending 

 for fully one-half their length beyond the tip of the abdomen. Each tarsus is armed 

 distally with two equal claws, between which is a delicate onychium, or pulvillus, 

 composed of a central, longitudinal part from which springs several slender, down- 

 wardly projecting seta-like elements. Length, 0.30 mm.; width, 0.16 mm. 



From Hillsboro, Oregon; causing a silvering of the leaves of the apple. 

 The apple branches which the writer examined were badly infested 

 and damaged by this mite. Serious injury to apple leaves was reported 

 from Hillsboro, Oregon, in 1913. 



Hypoaspis armatus n. sp. 



Male. — A uniform, Ught yellowish-brown color. Body oval, almost evenly rounded 

 behind. Epistome long and ending in two prominent spines or teeth. Chelicerse 

 very characteristically armed. At the tip of each there is a very prominent lateral, 

 recurved, hook-hke projection with a barb at its tip; below this is a sharp incurved 

 hook, which crosses its mate from the opposite side; above is a reduced arm with a 

 pectinate process dorsaUy and in front. Ventrally near the base of the armed part of 

 the chelicera is a simple tubercle. Peritreme very slender, curved similar to the 

 margin of the body next to which it lies. Abdomen clothed above with a few moderate, 

 shghtly pectinate setse; the shoulder pair is especially prominent. At the anterior end 

 of the abdomen near the median line is a pair of medium, simple setae. Legs long; 

 tarsus of leg I about one and a half times as long as the tibia and bearing a pair of 

 weak claws at the tip of a very long pedicel; tibia of leg I fuUy twice as long as broad 

 and broader distally than proximally; last pair of legs extending beyond the tip of 

 abdomen. Length, 0.27 mm.; width, 0.17 mm. 



