64 BULLETIN 168, UNITED STATES NATIONAL MUSEUM 



suranal and subanal valves (pi. 24, fig. 266) relatively large, siibtri- 

 angular. Tibio tarsus with a distal subsegment (pi. 24, fig. 267). 

 Hind claws the largest. Unguis (pi. 24, fig. 267) curving, without 

 lateral teeth, unidentate at the middle of the inner margin. Unguic- 

 ulus half as long as unguis, lanceolate, untoothed. One long tenent 

 hair, extending almost to apex of unguis. Furcula appended to the 

 fifth abdominal segment, long, attaining the ventral tube. Manu- 

 brium with many dorsal setae and two pairs of ventral subapical setae. 

 Dentes one-fourth longer than manubrium, rather stout, slightly 

 narrowing distaUy, with 20 to 25 coarse dorsal folds, which become 

 successively smaller from the base toward the apex of the dens, and 

 end before the apex at a distance equal to the length of the mucro. 

 Dentes with several dorsal setae and stift" ventral setae. Mucro (pi. 

 24, fig. 268) as long as hind unguiculus, with narrow outer and inner 

 lamellae, and subequally bidentate; apical tooth feebly curving; ante- 

 apical tooth slightly larger, suberect. Rami of tenaculum quadriden- 

 tate; corpus with one ventral seta (sometimes two). General clotiiing 

 of short dense simple setae, longer on the posterior part of the abdo- 

 men; erect sensory setae a little longer than the others, simple. 

 Integument smooth. Maximum length, 0.7 mm. 



Remarks. — The apical tooth of the mucro is, in rare instances, 

 reduced. Especially characteristic of this species are the strongly 

 telescopic antennae, inserted in foveae, and the large anal segment. 



The only specimens of this species that I have seen were those 

 given to me many years ago by Samuel Henshaw. They were taken 

 from a vial (Museum of Comparative Zoology) containing practically 

 innumerable individuals, found in a mushroom cellar. 



Cotypes. — U.S.N.M. no. 42977. Some of the cotypes are in the 

 American Museum of Natural History. 



Distribution. — Recorded as follows: 



New York: Long Island, Dr. J. A. Lintner. 



PROISOTOMA (PROISOTOMA) CONSTRICTA. new species 



Plate 24, Figures 269-272 



Description. — Pale yellow, marked with a fine network of minute 

 black specks. In hea\dly pigmented individuals, however, this net- 

 work becomes obscured, and the general color is purple or blackish 

 purple. Antennal segments mottled with purjile. Legs white 

 beyond coxae, or mottled throughout with purple. Furcula white. 

 Eyes eight on each side, unequal. Postantennal organ (pi. 24, fig. 

 269) large, elliptical, strongly constricted at the middle, thick-walled, 

 three times as long as the diameter of an adjacent eye. Antennae 

 subequal to head in length, or a little longer, with segments in relative 

 lengths about as 11:19:19:34; third segment sometimes slightly 

 longer than the second. Sense organ of thii'd antennal segment 



