NO. 2134. NORTH AMERICAN COLLEMBOLOUS INSECTS— FOLSOM. 507 



I have enlarged the description of the genus in order that it may 

 include the eyeless species described here. Tliis genus has hitherto 

 been found only in Finland and Nonvay. 



PARANURA CAECA new species. 

 Plate 22, figs. 215, 21(3; plate 23, figs. 217-221. 



Wliite or pale yeUow. Eyes absent. Antennae shorter than the 

 head; segments in relative lengths as 14:13:11 :9; segments three and 

 four confluent dorsally, damarcated ventrally. Olfactory hairs of 

 third and fourth antennal segments 9 or 10 (fig. 215), including a 

 large dorsal semicircular hair. Sense-organ of third anteimal seg- 

 ment as in figure 216. Buccal cone acute, about as long as the width 

 of its base. Mandibles and maxiUae as in figures 217 and 218. Un- 

 guis un toothed (fig. 219). Unguiculus represented by a minute 

 tooth, near which a slender seta (fig. 220) often occurs. Tenent 

 hairs absent. Cuticular tubercles small. Clothing of sparse stiff 

 setae (fig. 221), which are simple (nonserrate) . Maximum length, 

 2.5 mm. 



The larger individuals are yellow, the smaller ones white. There 

 are no traces of eyes or of ocular pigment. 



Paranura caeca is a sluggish species of the humus-fauna. I have 

 found it in woodlands among damp, dead leaves and in damp soil. 



Urbana, 111., April 12, 13, 19, 20, 25, 26, May 2, November 8, 

 December 21. 



Coty pes. —C&t. No. 19907, U.S.N.M. 



Tribe NEANURIITI Borner. 



Neanwini Borner, 1901c?. 



Achorutini Borner, 1906. * 



KEY TO GENERA OF NEANURINI. 



Head of maxilla needlelike, without lamellae and teeth . . Neanura MacGillivray, p. 507. 

 Head of maxilla with toothed lamellae Protanura Borner. 



Genus NEANURA MacGillivray. 



Achorutes Templeton, 1835 (part). — Nicolet, 1841. 



Anoura Gervais, 1842. — Lubbock, 1862. 



Anura Nicolet, 1847.— Tullberg, 1869, 1871, 1872. 



Neanura MacGillivray, 18936. 



Achorutes Borner, 1906. 



Eyes usually present. Postantennal organs present or absent. 

 Antennae conical. Buccal cone present. Mouth parts suctorial. 

 Head of maxilla without toothed lamellae. UnguicuH absent. Fur- 

 cula and anal spines absent. Body with segmental reticulated 

 tubercles, which are usually large; abdomen often terminating in 

 two or four large rounded tubercles. Anal segment relatively large; 

 supra-anal valve bilobed. Anal spines absent. Integument tuber- 

 culate. Pseudocelli absent. 



