NO. 2222^ NORTH AMERICAN 0NYCHIURINAE—F0L80M. 641 



elliptical or oval. Pseudocelli of antennal bases 1+1 (fig. 20). 

 Antennae as long as, or slightly shorter than, the head. Sense organ 

 of third antennal segment (fig. 21) with five papillae, four guard 

 setae, a pair of sense rods, and two sense clubs, each with a stout 

 stalk supporting a coarsely papillate disk. Dorsal pseudoceUi of 

 body segments successively: 0, 1 + 1, 1 + 1, 1 + 1, 1+1, 1 + 1, 1+1, 

 2+2, 0; those of the fifth abdominal segment being in two oblique 

 pairs. Unguis (fig. 22) stout, feebly curving, untoothed. Ungui- 

 culus two-tliirds as long as unguis, with sublanceolate basal lamella 

 and acuminately prolonged apex. Anal spines two (figs. 23, 24) 

 stout, arcuate, subcqual in length to hind ungues, on prominent 

 separated papillae. Clotliing (figs. 25, 26, 27) of sparse short curving 

 setae and fewer but longer stiflF setae. Cubicular tubercles large 

 (fig. 28). Maximum length, 2 mm. 



The papillae of the antennal organ vary considerably in form; 

 they are usually stout, and rounded or subcorneal, though some- 

 times reduced and toothlike; in one instance, six papillae occurred 

 as an abnormahty, with the usual four guard-setae. There is some 

 variation in the clothing, as indicated in figures 26 and 27. The 

 cuticular tubercles are larger than in any other of our species of Ony- 

 cMurus. 



ApJiorura montis Bacon and A. lutea Bacon are synonymous with 

 A. cocMei Folsom, as I have found from a study of several cotypes 

 given to me by Mrs. Gertrude Bacon Chaffee. 



This species was discovered by Mr. J. W. Cockle in Kaslo, British 

 Columbia, at an altitude of 2,250 feet, where it occurred in masses so 

 dense as to cover the snow with a carpet of gold over patches of 

 several square yards. Some of the specimens found by Mr. Cockle 

 were white instead of yellow. 



In southern California at Bear Flats, on the slope of Mount San 

 Antonio, at an elevation of 6,000 feet, Dr. W. A. Hilton and Miss G. 

 A. Bacon found thousands of these insects in moist soil in a very 

 hmited area, white forms and yellow forms of all sizes occurring 

 together; the yellow variety being, however, the more abundant. 



My specimens from Oregon were taken on melting snow and under 

 wood on moist ground. 



British Columbia: Kaslo, January 31, February 23, March, J. W. 

 Cookie. 



Washington: L. Bremner (Stanford Univ.). 



Oregon: Hilgard, March 4, W. A. Newcombe. Corvallis, Decem- 

 ber 25, H. E. E^ving. 



Cahfomia: Mount San Antonio, April, W. A. Hilton, G. A. Bacon- 



Cotypes.— Csit. No. 12033, U.S.N.M. 



77403— Proc. N. M. vol. 53—17 41 



