66 Trans. Acad. Sci. of St. Louis. 



Laelaps llavus n. sp. 



PL X. f. 22. 



Yellowish brown; legs paler than the body. 



Palpi about one-half as long as leg I; mandibles stout, chelse sub- 

 equal. 



Body broad, two-thirds as broad as long; broadly rounded behind and 

 somewhat pointed in front. The whole of the dorsal surface of the 

 abdomen is chitinized. Peritreme extending beyond the coxee of the 

 last pair of legs. Sternum in the case of the female almost as broad as 

 long; genital plate of female large, truncate in front. 



Anterior pair of legs about as long as the body; tarsus longer than 

 the tibia, truncate at the distal end and bearing a small caruncle on 

 its inner distal aspect. Second pair of legs slightly stouter than the 

 others; third pair the shortest but stouter than the anterior pair; pos- 

 terior pair of legs extending about one-third their length beyond the 

 posterior margin of abdomen. Claws of the last three pairs of legs 

 rather small and situated on slender pedicels. 



Length, 0.52 mm.; breadth, 0.38 mm. 



Under logs. Collected by the writer at Areola, 111. Two 

 specimens. 



Hyletastes Gistl. 



Leg I with claws; dorsal shield entire; male genital opening on the 

 anterior margin of sternal plate; leg II of male unarmed; anal plate 

 small, separate in both se.xes. ' 



One species. 



H.yletastes niissouriensis n, sp. 



PL X. f. 23-2U. 



Yellowish brown, integument smooth. 



Palpi about one-half as long as the anterior pair of legs; distal seg- 

 ment very small, about one-half as broad and one-half as long as the 

 penultimate segment; hypostoma with cusps about half as long as the 

 basal segment of the palpus. 



Body oblong, sides almost parallel for most of their length; broadly 

 rounded behind and somewhat pointed in front. Dorsum hairless. Anal 

 plate triangular with corners rounded and the anterior margin almost a 

 straight line; genital plate almost twice as broad as the anal plate. 



Anterior pair of legs almost as long as the body; tarsus about one and 

 a half times as long as the tibia, truncate distally, with the caruncle 

 arising from the inner side; antepenultimate segment shorter than the 

 tibia. Second pair of legs slightly if any enlarged; tarsus of second pair 

 of legs one and a half times as long as the tibia; third pair of legs 

 shortest; fourth pair extending but slightly beyond the hind margin of 

 the body. 



Length, 0.50 mm.; breadth, 0.24 mm. 



Under bark and in trash. Collected by C. R. Crosby at 

 Columbia, Mo., and by the writer at Muncie, 111. 



