DESCRIPTIONS AND DETERMINATIONS OF SPECIES 39 



First pair of legs rather small, with slender claw ; second and third 

 pairs large, subequal, with rather heavy claws. 



Abdomen elongated oval. First segment narrow, with eight spines 

 of varying lengths on the posterior margin. Second to seventh segments 

 with two transverse rows of eight to twelve rather slender spines, and 

 with two spines near each lateral margin. Eighth and ninth segments 

 with one row of six spines. The first tergite, both divisions of the sec- 

 ond, and the anterior division of the third to seventh tergites, show a 

 well defined chitinized plate. The remaining divisions are not chitinized. 

 First pair of pleurites extremely small, with two short spines, and closely 

 oppressed to the second pair. Second to sixth pairs with a slight tooth at 

 each posterior angle, second with two stout spines close together on the 

 posterior margin, the third to sixth with three similar spines. Seventh 

 and eighth pairs smaller, without teeth, and with three slender hair-like 

 spines. 



On the ventral side, the first segment lacking, the second to sixth 

 segments with the same arrangement of plates and spines as is shown on 

 the dorsum. Seventh segment with one sclerite and eight spines, the out- 

 er pair on each side very long, the remainder very small. Genital plate 

 with four small spines arranged in a semicircle near the center ; gonapods 

 with three long and slender hairs, caudad of each gonapod a cluster of 

 spine-like hairs, each tuft composed of two stout hairs and several small 

 ones directly behind the gonapod. Three or four stout hairs and several 

 small ones at each posterior angle of the ninth segment. 



Description of the Male. — Total length .9 mm., length of head .2 

 mm., length of abdomen .6 mm., width of head .17 mm., width of thorax 

 .2 mm., width of abdomen .4 mm. 



Head, thorax and legs as in the female. Third joint of antennae 

 with two short, stout spines near the tip, which are not present in the 

 female. 



Abdomen with a smaller number of rows of hairs than in the female, 

 the second tergite and the second to sixth sternites only having two rows, 

 the remainder one. Tergites with well denned chitinous plates, sternites 

 with the anterior portion only chitinized. Second plate of the second ter- 

 gite slightly emarginate, with a group of two long and two very short 

 spines at the posterior angles, and with five spines between these groups. 

 Eighth tergite without spines, seventh sternite with six, eighth sternite 

 with two, remaining rows with practically the same number as in the 

 female. 



Abdomen pointed posteriorly, ending in a pair of finger-like pro- 



