No. 2303. iiEn SPIDERS OF AMERICA— McGREGOR. 647 



NEOTETRANYCHUS RUBI Trag&rdh. 



Tragardh (18) erected this genus in 1915 for a Swedish red spider 

 which was only observed on wild raspberries in the autumn. He 

 states that "to this genus belong hicolor Banks and modestus Banks, 

 which both have a simple, claw-shaped empodium." A careful 

 study of Banks's types, as elsewhere indicated, shows that in both 

 the above species the empodial claw is furnished with the group of 

 subbasal appendages, thus placing them in the genus ParatetraiiycJius. 



NEOTETRANYCHUS UNIUNGUIS (Ewing), 

 Tetmnychus uniunnds Ewing, 1917, Journ. Econ. Ent., vol. 10, no. 5, p. 497. 

 A greenish-3^ellow species. Palpi rather stout, reaching the tip 

 of tibia of leg I. Palpal claw rather short, strongly curved, and not 

 very sharp at its tip. "Thumb" of palpus stout, as 

 broad as long, reaching but not surpassing the palpal 

 claw; "finger" of "thumb" situated in middle of the 

 apex, about twice as long as broad, and rounded at 

 its tip. Hairs of "thumb" distributed as follows: 

 Two small ones on the inside of "thumb" near its 

 apex, one long hair, about as long as the "thumb" 

 itself, on the inside near the base; and another of fig. i.-neotet. 

 about equal length on top not far from the base. R^nychus uni- 



m^ T 1 • ■ « UNGUIS E^ING- 



Cnelicerae each ansmg near the base of plate, and palpal append- 

 making an evenly rounded loop posteriorly, and then ages (after kw. 

 passing forward for about two-thirds their length, 

 then in a do\^^lward direction to their tips. The only place that the 

 chelicerae are swollen is near their bases. Tarsus of leg I consider- 

 ably longer than the tibia. Tarsi each ending in a single claw, 

 Avhich is not strongly curved, but is very sharp; two tenent hairs. 

 Length, 0.59 mm. ; width, 0.42 mm. 



From Urbana, Illinois; on arbor vitae (Thuja occidentalis). 



Genus SCfflZOTETRANYCHUS Tragdrdh. 



Schizoietram/chi's Ti^aoArph, 1915, Med. Nr. 109, fr. Centr. f. fors. p^, jordbr. 

 Entom. avdel Nr. 20, p. 19. 



This genus is represented at present by a species in Germany 

 and one in the United States. 



Red spiders with empodial claw possessing two subequal simple 

 divisions ; penis with a large basal lobe and with a coarse tip. 



Type.—ScMzotetranycJius schizoims Zacher, originally designated. 



KEY TO SPECIES OF GENUS SCHIZOTETRANYXHUS. 



fl' Palpal "thuml) '" without digit; tarsus I very broad and truncate at tip, two claws 

 subequal ScMzotetranychis latitarsus Ewing. 



a^ Palpal "thumb" with slender terminal "finger" and adjacent digitulus; two 

 strong-curved tarsal claws; penis broader than that of teJorius, with an obtuse 

 basilar lobe Schizotetranychus schizopus Zacher. 



