NO. 2134. NORTH AMERICAN COLLEMBOLOUS INSECTS— POLSOM. 505 



hair. Sense-organ of third antenna! segment with two free rods, 

 unprotected by either an integumentary fokl or by guard-setae. 

 Unguis (fig. 205) slender, usually unidentate, rarely untoothed, with a 

 small tootlilike projection at its base. No knobbed tenent hairs. 

 Clotliing of sparse short setae, interspei*sed with longer setae, the 

 latter numerous on the posterior part of the al^domen. Cuticular 

 tubercles very small. Maximum length, 3 mm. 



The preceding description is compiled from European authors for 

 the most part; the only specimens that I have seen being two from 

 the Guthrie collection, which were kindly sent to me by Prof. H. F. 

 Nachtrieb. In these I could not, however, study the eyes, post- 

 antenjial organs, and antennal sense-organs, as the specimens were 

 mounted permanently in balsam without depigmentation. 



In Europe this species occurs on the seashore under seaweed or 

 wood, or on pools of water; and also inland under wood or stones and 

 on pools of fresh water. 



Anurida tullbergi has been found in Norway, Sweden, Finland, 

 Russia, Germany, and Switzerland. 



In North America the species has been reported from Florida by 

 Schott ('946) and by MacGiUivray ('94), and from Minnesota by 

 Guthrie ('03). 



ANURIDA AMORITA Folsom. 

 Plate 7, fig. 3; plate 22, figs. 20G-211. 

 Anurida amorita Folsom, 19026. — ^Axelson, 19036. 



General color bluish gray, due to the combined effect of indigo blue 

 motthngs and the white ground color (fig. 3). The dorsum of each 

 segment has two parallel broken blackish stripes (fig. 3). E3^es 

 (fig. 206) five on each side, on blackish patches. Postantennal 

 organs (figs. 207, 208) with 30 to 40 peripheral tubercles arranged 

 eUiptically or subellipticaUy. Antennae almost as long as the head; 

 segments as 12:12:11:10, in relative lengths; fu'st three segments 

 dilated apically; fourth rounded conical, with a largo subapical 

 sense-organ (fig. 209) consisting of three contiguous bladderlike 

 structures on a chitinous base. Body (fig. 3) elongate, abdomen 

 gradually dilated. Ungues of mid and hind feet (fig. 210) gradually 

 tapering from a broad base, slightly curving, strongly unidentate 

 near the middle of the inner margin; ungues of fore feet (fig. 211) 

 smaller and less tapering. No knobbed tenent hairs. Clothing of 

 dense short curving setae, with a transverse row of long hairs on 

 each segment. Maximum length, 4.1 mm. 



Anurida amorita was collected at Kukak Bay, Alaska, by the 

 Harriman Expedition, and has been reported from Siberia by Axelson. 



Cotypes.—Cixt. No. 5437, U.S.N.M. 



