120 Trans. Acad. Sci. of St. Louis. 



Abdomen two-thirds as broad as long; dorsum hairless. Genital 

 covers large, rectangular extending almost to the front margin of the 

 ventral plate, each about twice as long as broad. Anal covers about 

 the same size as the genital covers, and situated about one-fifth their 

 length behind the genital covers and an equal distance from the pos- 

 terior margin of the abdomen. They are much broader at their pos- 

 terior end than at their anterior end. 



Anterior pair of legs extending about one-half their length beyond 

 the tip of the rostrum; tarsus slightly longer than the tibia and with 

 a single, moderate, curved claw; tibia twice as long as genual and 

 about twice as broad at its distal end as at its proximal end. It has 

 on its lateral margin near the distal end a bristle slightly longer than 

 the segment itself; genual almost two-thirds as broad as long and 

 with a prominent inner and outer bristle. Posterior pair of legs extend- 

 ing slightly beyond the posterior margin of the abdomen; tarsus 

 shorter than the tibia; tibia club-shaped and with a prominent bristle 

 on its outer margin near its distal end. 



Length, 0.30 mm.; breadth, 0.20 mm. 



In moss. A single live individual came through from 

 India in the moss. Nilgiri Hills. 



LlSTROPHORIDAE. 



LABIDOCARPUS Trt. 

 Body strongly compressed; skin transversely striated. Legs of the 

 third and fourth pairs of the usual form but deprived of suckers and 

 armed with stout spines; legs of the first and second pairs composed 

 of a single piece in the form of a chitinous clasper. 



One species. 



Labidocarpus compressus n. sp. 



PI. XXXV. f. -',. 



In general appearance hyaline except for the anterior and basilar 

 portions of the cephalothorax which being strongly chitinized are 

 brown. 



Cephalothorax V-shaped from a side view, and, like the whole body, is 

 greatly compressed. Beak stout, almost structureless, but with a small 

 pair of dorsal hairs. Toward the middle of the dorsal surface of the 

 cephalothorax there are two pairs of long bristles, the inner pair of 

 which is the largest. Posterior part of cephalothorax transversely 

 striated. 



Abdomen half as long again as the cephalothorax, striated dorsally, 

 with a prominent pair of lateral bristles near its anterior end and a 

 very long pair of terminal bristles which equal the abdomen itself in 

 length. 



Anterior group of legs formed into large, stout, chitinized clasping 

 organs. Each is almost as broad as long. Posterior group of legs small 



