DESCRIPTIONS AND DETERMINATIONS OF SPECIES 41 



Description of the Female. — Total length .85 mm, length of head 

 .25 mm., length of abdomen .45 mm., width of head .14 mm., width of 

 thorax .20 mm., width of abdomen .45 mm. 



Head much longer than wide, rather cylindrical in shape and with 

 the antennae set well forward. The anterior margin is roundly pointed, 

 there are no temporal angles and the temporal margins are for the great- 

 er part of their length parallel and nearly straight, finally converging in 

 a smooth curve to form the slightly rounded occiput. Just behind the an- 

 tennae is a conspicuous, transverse suture. The anterior margin bears 

 several short hairs, there are two short hairs on each side in the anterior 

 angle between the lateral margin and the suture, and a single short hair 

 on each side just behind the suture. The rostrum is set close to the an- 

 terior margin and is surrounded by a chitinous ring. 



Antennae set well back from the anterior margin of the head; first 

 segment not conspicuously enlarged, second segment longer but nearly as 

 wide at its outer end. The third, fourth and fifth segments are subequal 

 in length, but the fourth segment is wider than the other two, giving the 

 antennae a slightly clavate appearance. 



Thorax very short, widest about the middle, the anterior margin 

 with a V-shaped notch, the posterior angle nearly straight and wider 

 than the anterior, the lateral margins convex. Mesothorax with a pair 

 of large spiracles and a medium pair of rather long hairs on the posterior 

 margin. First and second pairs of legs long and slender, with slender 

 claws which are slightly bifid at their tips. Third pair very large, with 

 broad, heavy claws and with a blunt, tooth-like projection on the anterior 

 margin of the femora. Sternal plate slightly longer than wide, the lateral 

 margin nearly straight diverging very slightly, the posterior margin near- 

 ly straight, the anterior margin quite convex. Coxae of first and second 

 pairs of legs widely separated, of the third pair approximate or con- 

 tiguous. 



Abdomen almost circular in outline without chitinized dorsal and 

 ventral plates. A single row of spines on each segment except the first, 

 which has none. Second segment with a median pair of rather short 

 hairs and a single hair near each lateral margin. Second to seventh seg- 

 ments each with eighteen to twenty- four long, slender, bluntly-pointed 

 hairs, arranged in three groups, a median group of eleven to fourteen 

 and two lateral groups of six to eight, the groups, however, not very dis- 

 tinctly separated. Eighth and ninth segments with a median pair of 

 hairs ; seventh and eighth segments each with two long hairs at the pos- 

 terior angles. Only the second to fourth segments bear pleurites. All 



