NO. 2134. NORTH AMERICAN COLLEMBOLOUS INSECTS— FOLSOM. 503 



becoming longer on the posterior part of the abdomen. Integu- 

 mentary tubercles (fig. 196) coarse, tooth or thornlike, largest toward 

 the apex of the abdomen, longitudinally furrowed, the outlines of 

 their bases forming the characteristic patterns shown in figure 197. 

 Anal spines represented by two slightly modified integumentary 

 tubercles, as in figure 196. Length, 2 mm. 



Described from 11 cotypes, Corvallis, Oregon, December 25, under 

 wood on moist ground. Collected by Dr. Henry E. Ewing, after 

 whom the species is named. 



Cotypes.— Cat. No. 19906, U.S.N.M. 



Genus ANURIDA Laboulb^ne. 



Achonites, Guerin, 183G. 

 Anoura Nicolet, 1847. 

 Amirida Laboi>lb6ne, 1865. 

 Aphoromma MacGillivray, [18936.] 

 Anuridella, Willem, 1906. 



Eyes 10 or none. Postantennal organ present; peripheral tubercles 

 several or many, arranged in a circle in most species. Mouth parts 

 not projecting in a cone. Head of maxilla with three toothed 

 lamellae. Mandibles without molar surface. Unguiculus absent. 

 Furcula absent. Anal spines absent. Pseudocelli absent. Body 

 without large segmental tubercles. Cuticular tubercles present. 



KEY TO SPECIES OP ANURIDA. 



Dark blue or bluish gray. Eyes 10. 



Postantennal organs with 6 to 10 peripheral tubercles, arranged in a circle, 



maritima, p. 503. 

 Postantennal organs with 17 to 40 peripheral tubercles, arranged in a regular 

 or irregular ellipse. 

 Peripheral tubercles 17 to 30; ungues slender, feebly unidentate 



or untoothed tullbergi, p. 504. 



Peripheral tubercles 30 to 40; ungues stout, strongly unidentate 



amorita, p. 505. 

 White; eyes absent granaria, p. 506. 



ANtJIilDA MARITIMA Guerin. 



Plate 22, figs. 198-202. 



.ilcftoru^es man7i/rtus Guerin, 1830. 



Anoura viaritima Nicolet, 1847. 



Anurida maritima Laboulbene, 1865. — Packard, 1873. — MacGillivray, 1891, 

 18936, 1894.— ScnoTT, 1894a, 18946.— Dalla Torre, 1895.— Schaffer, 

 1896.— Carpenter and Evans, 1899.— Willem, 1900.— Evans, 1901a, 

 1908.— Davenport, 1903.— Imms, 1906. 



Lipura maritima Lubbock, 1873. 



Blackish blue. Eyes (fig. 198) five on each side. Postantennal 

 organs (fig. 199) with 6 to 10 peripheral tubercles arranged in a 

 rosette. Antennae shorter than the head; last two segments con- 



