94 FOLSOM [96] 



ISOTOMA VIRIDIS Bourl., var. ARCTICA Schott. 



(PI. iv, fig. 5; PL vn, figs. 40-42.) 



Isotoma viridis, var. arctica SCHOTT, K. sven. vet. Akad. hand., xxv, no. n, 

 p. 61, taf. 5, fig. 4, 1894. SCHAFFER, Fauna Arctica, I, lief. 2, p. 245, 

 1900. 



The preceding description of the typical form applies equally well 

 to the variety arctica with the following modifications : arctica is 

 longer, more slender (fig. 5) and is yellow, marked with dark blue; 

 each of the last seven segments bears a dorsal deltoid mark by which 

 the variety may be recognized. Length, 7 mm. 



Three specimens, Popof Id., 1899 (no. 96). 



The two types of Schott came from Port Clarence, on the American 

 side of Bering Strait. Schaffer gives southern Russia as a second 

 locality. 



ENTOMOBRYA KINCAIDI sp. nov. 

 (PI. vin, figs. 43-45-) 



Olive green with pale mottlings. Head yellowish, oral region dark. 

 Eye patches widely separated; eyes (fig. 43) eight on either side. 

 Antennae twice as long as the head, or half as long as the body, with 

 segments related as 3:5:4:6; basal ring blackish ; basal segment 

 yellow, dusky proximally, second yellow, third yellow, dark distally ; 

 fourth elliptical, yellow with dusky apex. Body fusiform, segments 

 as 4 : 24 : 15 : 10 : 13 : 13 : 40 : 12 : 6 in relative lengths ; sides dusky, 

 also the anterior border of the mesonotum, and the posterior borders 

 of the fourth and sixth abdominal segments. Legs yellowish ; superior 

 claws (fig. 44) broad, straight, inner margin bidentate, a tooth occur- 

 ring one-fourth, and another one-half the distance from the apex; 

 outer margin untoothed; inferior claws two-thirds as long, broadly 

 linear, acute, untoothed ; tenent hair single, knobbed. Furcula white, 

 as long as the antenna? ; dentes slender, one-third longer than the 

 manubrium; mucrones (fig. 45) tridentate, as usual, with an apical 

 hook, a second tooth which is conical, erect, and as long as the width 

 of the dens, and a third, small acicular oblique tooth ; three barbellate 

 hairs project far beyond the mucrones. Antennae, legs and furcula 

 densely clothed with short curving barbellate setae interspersed with 

 long barbellate hairs, which are longest on the last three abdominal 

 segments ; stout clavate barbellate setae occur between the eye patches, 

 on the occiput and on the anterior borders of meso- and metanotum. 

 Length, 1.9 mm. 



