March, i9-'i.| e'llAMHERI.IN : I.I\Yl'Mn».\F. OF Al.ASKA. 35 



parts, all orbits broadly, pronotuin intirdy. tc^ulx, nu-soplcur*. cephalic por- 

 tion of nicsostcrnum, legs entirely, and venter of abdomen, extending slightly 

 onto lateral parts of terga : clypeijs narrowly, roundly, deeply eniarginate: 

 median fovea deep oval pit ; frontal crest sharp, well marked, linear, trans- 

 verse, unbroken ; ocellar basin depressed, flat, limited by linear walls ; antennx 

 with third and fourth segments sube<iual. fifth segment shorter; head and 

 thorax setaceous, polished: wings hyaline; veins brownish, stigma and costa 

 paler; procidentia small, rounded, not longer than wide. 

 Habitat: Ithaca, N'ew York. Xo. 8.48( ?)-i-i. 



This species should Ite placed near popuU Marl., hut the color of 

 the head and the kniii^tli of the antennal sejjmcnts will separate them. 



LINYPHIIDAE OF ST. PAUL ISLAND. ALASKA. 



By Rali'h \'. CiiA.MitF.Ri i\. 

 CvMnRiDGE. Mass. 



While on St. Paul Island in 1910 Professor Harold Heath collected 

 and sent to me the spiders here listed. They compose an interesting 

 lot in which all the specimens helong to the family Linyphiidae. Ten 

 species are rei)resented. of which four are new, two of these bcinij 

 here made the types of genera. The previously known species ar; 

 forms occurring on the adjoining mainland of North .\merica or 

 Asia, or on both. Arctilaira bcUans new species (--Hilaira glacialis 

 Kulczynski, nee Thorell ) is an .\rctic form occurring across .Arctic 

 America and Siberia, the present hcing its most soutlierly record. 

 A new North American genus related to Arctilaira is also here de- 

 scribed. All types are in the author's collection. 



Cornicularia clavicornis Emerton. 



Trans. Conn. .\cad.. 1882. 6. p. 43. pi. S, f. 7-76. 



One male and one female. 

 Erigone sibirica Kulczynski. 



Mem. .\cad. Imp. Sci.. St. Pctcrsb.. i<)oS. .ser. S. iS, p. 18. pi. I, 

 f. 9-12. 



This species, to judge from the intmber of specimens in the Id. 

 must be a common form on the island. The palpal organ of the males 

 agrees completely with Kulczynski's description and figures. The 



