OP WASHINGTON, VOLUME XII, liUll. 



Family TETRANYCHID.. 

 Raphignathus brevis, new species. 



Body yellowish red, legs rather paler. Body about one and one-half 

 times longer than broad, surface marked with small irregular polygons; 

 cephalothorax with four large clavate hairs each side; abdomen with five 

 such hairs each side, two of them at posterior margin; beneath at tip is 

 a shorter pair a little behind the anus. Legs all very short and bristly, 

 the hind pairs not reaching behind abdomen; the anterior tarsi rather 

 blunt at tip, the hind tarsi tapering; the bristles on the basal joints of 

 the front legs are stouter and more spine-like than the other bristles. 

 The palpus ends in a stout curved claw, as large as the claws of the tarsi. 



Length, 0.35 mm. 



From Falls Church, Virginia, in moss. 



Family GAMASID.E. 

 Halarachne attenuata, new species. 



Pale whitish in color, dorsal shield, legs, and sternum yellowish. Body 

 slender, anterior half about two and a half times as long as broad, then 

 narrowed to a slender tail, which is rather longer than body and slightly 

 clavate at the tip. Above, on the dorsum, is an elongate basal shield, 

 with a small, constricted anterior part and a truncate, notched tip. The 

 stigmal aperture with the peritreme is just behind coxa III and visible 

 from above. The sternum is small and narrow, emarginate in front, and 

 with a pointed tip, which extends only opposite to coxae IV. Legs I 

 and IV are subequal in size, the joints short, except the tarsi, which are 

 rather slender; legs II and III much stouter than others, but nearly 

 as long, the tarsi stout and with heavier claws. 



Length, 4 mm. 



Taken from a seal pup at St. Paul Island, by Mr. J. Judge, 

 October 7, 1909. Differs at once from other species in the 

 slender "tailed" abdomen. 



Gamasus frontalis, new species. 



Pale yellowish, a reddish, corneous stripe on each anterior side meet- 

 ing in front. Body subtriangular, broadly rounded behind, somewhat 

 constricted in front, over one and a half times as long as broad; on each 

 anterior edge from above coxa II to the middle of front is a narrow, 

 corneous strip, of reddish or yellowish color, very prominent. The dor- 

 sal shield is entire and occupies about three-fourths of the surface. The 

 dorsal surface has many curved bristles in rows, on the middle of ante- 

 rior margin is a pair of straight bristles close together, and each side of 

 them is a curved bristle: also a pair of curved bristles where the two 



