40 BULLETIN 168, UNITED STATES NATIONAL MUSEUM 



antennal segment. Fourth abdominal segment longer than the 

 tliird (as 3:2). Genital and anal segments not ankylosed. Tibio- 

 tarsus with a distal subsegment. Unguis (pi. 12, figs. 120, 121) slender, 

 curving, without lateral or inner teeth. Unguiculus scarcely more 

 than one-third as long as the unguis, subulate apically, with a pair of 

 rounded inner lamellae, untoothed. Tenent hairs absent. Furcula 

 extending to the ventral tube. Manubrium equal to dentes in length, 

 with numerous dorsal setae but naked ventrally. Dentes stout, not 

 narrowing distally, rounded apically, without dorsal tubercles or 

 folds, with many dorsal and ventral setae. Mucro (pi. 12, figs. 

 122-124) stout, somewhat longer than hind unguiculus, in lateral 

 aspect strongly rounded ventrally, bidentate, with equal outer and 

 inner lamellae. Kami of tenaculum tridentate; corpus with one 

 seta. Clotliing (pi. 12, fig. 125) of dense short equal simple setae, 

 a little longer on the posterior part of the abdomen. Long erect 

 sensory setae absent. Integument smooth but minutely pseudo- 

 granulate. Length, 2 mm. 



Remarks. — This active species is found usually on or near water. 

 It occurs on the seashore under seaweed, stones, or debris, and inland 

 on the surface of water or on damp soil. 



Distribution. — P. schotti has been recorded from Sweden, Spits- 

 bergen, Finland, German}^, France, Switzerland, Rumania, Great 

 Britain, Tripoli, and French Guiana. 



New York: Lakeville, NovemlDer 13, under board on lake shore, E. A. Maynard. 

 California: Vicinity of Lake Cliabot, G. Eisen (California Academy of Sciences). 



PROISOTOMA (BALLISTURA) EWINGI. new species 



Plate 13, Figures 126-130 



Description. — Body stout. Bluish or grayish, with white inter- 

 segmental bands. Pigment mottled dark blue, in the form of rounded 

 granules, frequently surrounding hypodermal nuclei, which then 

 appear as pale rounded spots. Sternum pale. Antennae spotted with 

 blue. Legs unpigmentcd beyond the coxae. Furcula unpigmented. 

 Pronotum pigmented. Eyes (pi. 13, fig. 126) eight on each side, 

 equal. Ocular patch more elongate than is usual in the subgenus. 

 Postantennal organ (pi. 13, fig. 126) broadly elliptical, almost three 

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

 shorter than the head (about as 23:26), with segments in relative 

 lengths about as 8:9:10:18; first segment cylindrical; second and third 

 subclavate; fourth elliptical. Sense organ of third antennal segment 

 with a pair of subcylindrical pegs, freely exposed, and with three 

 guard setae. Fourth antennal segment with numerous curving 

 olfactory setae. Third abdominal segment shorter than the fourth 

 (as 5:6 or 5:7). Genital and anal segments not 'ankylosed. Anus 

 directed ventroposteriorly. Tibiotarsus with .'a distal subsegment. 

 Unguis (pi. 13, fig. 127) unusually stout, without lateral or inner 



