Eicing — New North American Acarina. 57 



Rliyncholophus pollicaris n. sp. 



PL VIII. f. U. 



Pale, yellowish pink. Body clothed with stout, simple spines. 



Palpi as long as the first two segments of leg I; thumb greatly swollen, 

 surpassing the palpal claw and well clothed w'ith almost straight hairs; 

 claw rather sharply curved downward; third segment of the palpus 

 about one-half as long as the second. Dorsal groove extending about 

 one-third its length beyond the eyes, swollen at its posterior end. A 

 single pair of eyes present, situated at the level of the second pair of 

 legs and about half way between the dorsal groove and the lateral 

 margin. 



Body small, about three-fifths as broad as long, broadly rounded 

 behind. Posterior group of legs situated at about the middle of the 

 abdomen. 



All the legs very long, being much longer than the body. Anterior 

 pair twice as long as the body; tarsus of leg I slightly swollen, about 

 one-half as long as the tibia; tibia slightly longer than the preceding 

 segment. Second pair of legs two-thirds as long as the anterior pair; 

 third pair almost as long as the first pair. Last pair of legs the longest, 

 being about two and a half times as long as the body; tarsus of leg IV 

 very slightly swollen, less than one-third as long as the tibia; tibia and 

 its preceding segment subequal. 



Length, 0.90 mm.; breadth, 0.50 mm. 



Found upon the bark of wild cherry. Collected by the 

 writer at Urbana, 111. 



This species is remarkable for the great size of the 

 palpal thumb and the length of the legs. 



Rliyiiclioloplius par\iseto.su8 n. sp. 



PL VIII. f. 5. 



Body black; legs and mouth parts red; integument very finely and 

 uniformly striated. Body very sparsely clothed v.'ith minute, scale-like 

 setae (hence the name parvisetosus). 



Palpi not as long as the first two segments of the anterior legs; palpal 

 claw large, stout and possessing a rov/ of four sharp teeth on its inner 

 ventral aspect; thumb large, clavate, slightly surpassing the claw and 

 well clothed with bristles. Dorsal groove extending into the anterior 

 tubercle of the cephalothorax, which bears a whorl of ten long, stout, 

 straight, slightly pectinate bristles. 



Body subpyriform, the broadest part being between the anterior and 

 posterior groups of legs; uniformly rounded posteriorly. 



Anterior pair of legs about one-third as long again as the body; tarsus 

 of leg I three-fourths as long as the tibia, slightly sv/ollen; tibia sub- 

 equal to its preceding segment. Second and third pair of legs shorter 

 than the first pair and subequal. Last pair of legs much the longest, 

 being about twice as long as the body; tarsus of leg IV not swollen, 

 about two-fifths as long as the tibia; tibia about one and a half times 



