102 FOLSOM 



the dental spines are nine to eleven on either side, there being one or 

 two large additional spines near the dental scale, as in fig. 53. The 

 same varieties, which also occurred frequently with typical examples 

 of niger^ are evidently americatms Schott (1896, p. 172) which, in- 

 deed, was described as being a very variable species. The interrela- 

 tions of americanus and niger I have discussed on p. 99. 



Occurred among fifty-five specimens of arcticus and niger^ Muir 

 Glacier, west side, June 12, 1899 (No. 63) ; also at Cook Inlet (No. 

 60) with typical niger. 



PAPIRIUS PALMATUS sp. nov. 

 (PI. VIII, figs. 54-56.) 



Pale yellow, laterally washed with purplish, or else blackish-pur- 

 ple, with pale rounded lateral spots ; face with a broad median pur- 

 ple stripe. Eyes (fig. 54) eight on either side, on large black 

 patches. Antennae slightly shorter than the body, purple, paler ba- 

 sally ; third segment with six annulations behind the swollen apex ; 

 fourth lanceolate, with two annulations below the middle. Superior 

 claws (fig. 55) long, slender, tapering, feebly curving, outer surface 

 unidentate two-fifths from the apex ; inner margins with a pair of teeth 

 at about one-fourth, and a second pair at one-half the distance from the 

 apex (only two teeth show in a profile aspect of the claw) ; inferior 

 claw two-thirds as long as the other, lanceolate, acuminate, with a stout 

 knobbed subapical tenant hair as long as the claw itself, and with a 

 long stiff basal spine borne on the rounded inner margin ; an extra long 

 subapical hair occurs on the tibia. Furcula white, attaining the mouth ; 

 segments related as 3 : 5 : 2 ; dentes each with a lateral series of stiff 

 setae, of which the proximal alone is simple, the others becoming suc- 

 cessively shorter and serrately compound (fig. 56) ; all the setje are 

 simple, though, in small individuals; mucrones (fig.' 56) long, slen- 

 dar, concave, with twenty to thirty rounded teeth on either margin. 

 Dorsum clothed with numerous short stiff setae and several long spin- 

 ous hairs; stiff setae on antenna and legs. Maximum length, 2.24 

 mm. 



Type. — Cat. No. 5434, U. S. Nat. Museum. 



Described from twenty-four types : thirteen, Sitka, June, 1899 (Nos. 

 64, 71); six, Yakutat, June, 1S99 (Nos. 57, 58); three. Berg Bay, 

 June 10, 1899 (No. 72); one, Kodiak (No. 65); one. Fox Point, 

 July, 1899 (No. 67). 



Papirius falmatus is most nearly allied to P. aier L. (Tull. 1871, 

 p. 146; 1872, p. 34, taf. 3, figs. 26-36). 



