664 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 59. 



Tarsal claws stout, as in other species of the genus; empodial hairs 

 very fine, a single pair surpassing the tarsal claws. Length, 0.36 mm. ; 

 width, 0.26 mm. 



Type locality. — Parker, Illinois. 



Type slide— Cut. No. 24028, U.S.N.M. 



Described from a single specimen, the type. This species is dis- 

 tinguished at once from the three other described species in having 

 the dorsal setae setiform and not clavate. Specimens were collected 

 in moss by L. M. Smith. 



Genus SYNCALIGUS Berlese. 



This genus, formerly known as Caligonus, has recently been divided 

 by Berlese into three. For the two new genera the names, Horno- 

 caligus and Caligonella, have been suggested. The wisdom of making 

 this division may well be questioned, hence the genus name is here 

 used in its former broader sense. 



SYNCALIGUS TRIDENTIFER, new species. 



Plate 125, fig. 6. 



Preserved specimens yellow. A well-armed species. Cephalo- 

 thorax with four pairs of large, simple, slightly curved setae; a frontal 

 pair, a pair just inside and in front of the eyes, and two pairs behind 

 and lateral to the eyes. The single pair of eyes is situated above 

 second pair of legs, but inward from lateral margins of body. Cheli- 

 cerae exceedingly sharp and needle-like, but with two chelae each. 

 Palpi stout, each with strongly curved claw at tip. At the base of 

 palpal claw on the inside is a small clawlike chitinous projection of 

 penultimate segment. Palpal thumb cylindrical and not reaching 

 tip of claw ; terminal seta or finger ending in three prongs, two being 

 somewhat lateral in position; other setae of thumb conspicuous. 

 Abdomen with nine pairs of dorsal setae arranged as follows: Five 

 pairs forming two longitudinal rows, two pairs on shoulders, one pair 

 above last pair of legs and not far from margin of body, and a lateral, 

 sub terminal pair. Legs medium to stout; anterior pair extending 

 beyond the palpi by the full length of their tarsi and a third the length 

 of their tibiae; posterior pair extending beyond the tip of abdomen 

 by over one-half their length. Tarsal claws large and stout, those of leg 

 one about one-half as long as tarsus; empodial hairs fine, two of them 

 slightly exceeding the claws. Length, 0.49 mm.; width, 0.27 mm. 



Type locality. — St. Paul, Minnesota. 



Type slide.— Cat. No. 24029, U.S.N.M. 



Described from a single specimen selected as the type. This species 

 is closely related to S. mail (Ewing), a very serious pest on apple 

 trees in Oregon. It is probably a vegetable feeder, although found 

 under a log, where it probably was hibernating, as specimens were 

 taken November 8. 



