NO. 2134. NORTH AMERICAN COLLEMBOLOVS INJECTS— FOLSOM. 487 

 ACHORUTES HUMI, new species. 



Plate 12, figs. 59-6G. 



Purplish, yellowish, or greenish above; pigment purple, ground 

 color pale yellow; white or pale yellow beneath; antennae purple. 

 Eye spots black, conspicuous. Eyes (fig. 59) eight on each side. 

 Postantennal organs (fig. 60) with foui' subequal peripheral tubercles. 

 Antennae slightly shorter than the head; segments as 17:17:20:30 

 in relative lengths. Sense-organ of third antennal segment as in 

 figure 61. Unguis (fig. 62) stout, without teeth or feel^ly unidentate 

 one-fourth from the apex. Unguiculus long (fig. 62); basal lamella 

 suboblong; distal haK acicular. Tenent hairs 3, 3, 3, knobbed and 

 long. Rami of tenaculum tridentate. Dens three times as long as 

 mucro, with six dorsal setae. Mucro elongate, in form as in figures 

 63 and 64, with semi-elliptical outer lamella, terminating before the 

 apex. Anal spines (fig. 65) short (less than half as long as hind 

 ungues), stout, curving, on papillae that are shorter than the spines. 

 Clothing of short setae, stiff or curving (fig. 66), and sparse except 

 on the posterior part of the abdomen. Length, 0.8 mm. 



I have taken this species in abundance in woodlands in damp soil 

 and among dead leaves on the ground. 



Urbana, Illinois, April 19, 26, May 2. 



Cotypes.— Cat. No. 19899, U.S.N.M. 



ACHORUTES TULLBERGI Schaffer. 



Plate 12, figs. 67-73. 



Achonites dichius Tullberg, 1876. — Uzel, 1890. — Schott, 1894a. — Dalla Torre, 



1895.— Schaffer, 1896.— Skorikow, 1900. 

 Achonites dubius, var. concolor Carpenter, 1900. 

 Achonites tullhergi Schaffer, 1900. 

 Achonites tullhergi, var. concolor Schaffer, 19006. — Wahlgren, 1907. 



Uniform ])lackish blue. Eyes (fig. 67) eight on each side. Post- 

 antennal organs (fig. 68) with four (sometimes five) peripheral 

 tubercles. Antennae shorter than the head; segments as 6:7:9:9 in 

 relative lengths ; sense-organ of third segment as in figure 69. Ungues 

 (fig. 70) stout, slightly curving; inner margin unidentate one-third 

 from apex. Unguiculi with setaceously prolonged outer margin and 

 with the basal lamella suboblong on the second and third pairs of 

 feet. Tenent hairs knobbed; 2, 3, 3, as a rule; occasionally 3, 3, 3, or 

 1, 3, 3. Mucrones (fig. 71) one-third dentes in length, elongate- 

 cuneate, apically rounded, with narrow lamella. Anal spines (fig. 72) 

 two, haK as long as hind ungues, arcuate, on prominent contiguous 

 papillae. Clothing (fig. 73) of sparse short curving setae, with longer 

 setae on the posterior part of the abdomen. Length, 2 mm. 



The variety concolor of Carpenter is pigmented uniformly; while 

 typical dubius is flecked with pigment. 



