NO. 2134. NORTH AMERICAN COLLEMBOLOUS INSECTS— F0LSO.]f. 513 



former without molar surface, the latter without terminal toothed 

 lamellae. Unguis (fig. 245) stout, curving, without teeth. Unguicu- 

 lus absent. Tenent hairs absent. Sixth abdominal segment visible 

 from above. Supra-anal valves bilobed; infraanal valves bilobod. 



Head with 10 largo tubercles: one between the bases of the anten- 

 nae; a transverse row of five, including the two ocular tubercles 

 and a large median tubercle; a posterior transverse series of four,' 

 in which the two dorsal tubercles are undeveloped and are represented 

 by a pair oC small setae. 



The two dorsal tubercles are similarly undeveloped and repre- 

 sented by two small setae on all the body segments from the pro- 

 thorax to the fourth abdominal segment, inclusive. Prothorax with 

 four segmental tubercles; mosothorax to fourth abdominal segment, 

 inclusive, with six eacli; genital segment with four largo tubercles; 

 anal segment with two. The abdomen in dorsal aspect terminates 

 in four largo rounded tubercles. 



The setae of the tubercles are long, stiff, and nonserrato; the 

 remaining setae of the body arc sparse, small, and curving. 



Length, 1.8 mm. 



I have referred my specimens to Ncanura quadrioculata Guthrie 

 because they agree with his description, as far as it goes; it does not 

 go very far, however, so I am not positive that the specimens belong 

 to that species. 



The name Neanura quadrioculata is, by the way, preoccupied by 

 Borner ('01), and the form that I have described here is evidently 

 different from his. (See Borner, '015, p. 4.32, and Linnaniemi, '12, 

 p. 77). It remains to be seen whether Guthrie had Borner 's species 

 in hand or, as is more probable, a new species. 



The nine specimens of this species that I have studied were sent 

 to me by Mr. H. S. Barber; some of them were alive and showed 

 the luminosity that he has described ('13, p. 46). 



Jackson's Island, Maryland, June 30, in rotting hemlock log, 

 H. S. Barber. 



Virginia shore, opposite Plummer's Island, Maryland, October 18, 

 19, H. S. Barber. 



Sulifamily 3?OI3XJKIN"^^E Borner. 



Poduriiiae Bornek, 1906. 



Genus PODURA Linnaeus. 



Podura Linnaeus, 1758. 

 Hypogastrura Bourlet, 1839. 

 HydropoduraBoRNER, 1901c. 

 Podura Borner, 190G. 



Head hypognathous. Eyes near the posterior part of the head; 

 eight on each side. Postantennal organ apparently absent, repre- 

 10600°— Proc.N.M.vol.50— 16 33 



