112 ENTOMOLOGICAL NEWS. [Mar., '15 



base of the patella is a prominent but much shorter spine. Each femur 

 of the second pair of legs bears a long slender spine on its dorsal 

 aspect; this spine is somewhat smaller than either of the enormous 

 spines borne by the femora of the first pair of legs. All the legs 

 bear rather prominent caruncles at the tips of their tarsi; tarsal claws 

 rather weak. Total length of female, 0.77 mm. ; width, 0.50 mm. 



Male.— In general similar to the female, but smaller. Body broadest 

 above the third pair of legs, instead of above the last pair, as is the 

 case with the female. Sternal plate about twice as long as broad; 

 genital opening situated about its width from the anterior margin of 

 the genital plate. The sternal plate bears four pairs of long, straight, 

 sharp, backwardly directed spines, situated as follows : One pair at 

 the genital opening about one-half of the distance from the opening to 

 the lateral margins of sternal plate, one pair on the lateral margins 

 of the sternal plate opposite the second pair of legs, one pair situated 

 on the lateral margins opposite the third pair of legs, and one pair 

 situated sublaterally half-way between the third and fourth pairs of 

 legs. Anal plate somewhat different from anal plate of female, its 

 sides concave ; it extends backward to the posterior margin of the 

 abdomen. 



Coxa of leg I, with a row of three stout spines along its lateral 

 margin as is found in the female, but they are longer in the male ; 

 proximal spine considerably longer than the other two. Fourth 

 legs extending beyond the tip of abdomen by about one-third their 

 length. Total length of body, 0.63 mm. ; width, 0.36 mm. 



From Ithaca, New York State ; taken from muskrat by the 

 writer. 



Described from four females and one male. This species is 

 quite distinct from the others of the genus on account of it3 

 large spines. 



Liponyssus crosbyi n. sp. (Plate IV, Fig. 3.) 



A moderate-sized, pale yellowish brown species, without prominent 

 hairs or spines. 



Female. — Mouth-parts prominent. Palpi two-thirds as long as the 

 first pair of legs ; mandibles long, slender, when extended reaching 

 the tips of the palpi. 



Cephalothorax not demarcated from abdomen, almost nude. Sternal 

 plate slightly broader than long, broadest at its posterior end, and with 

 three pairs of submarginal bristles ; all long, straight, and directed 

 backward. 



Abdomen about two-thirds as broad as long, evenly rounded behind, 

 and sparsely clothed with fine hairs. Anal plate triangular, slightly 



