512 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.50. 



segment stout, globose, reticulate; second and third globose, slightly 

 or not at all reticulate; fourth conical, reticulate; the minute tu- 

 bercles successively smaller on the first three segments but of equal 

 size on the second and fourth. The large tubercles which characterize 

 the genus coalesce on the head of this species, but are indicated by the 

 arrangement of the sctigerous, reticulated areas. Buccal cone is in 

 figure 238. Body segments related in length as 3:4:5:6:5:5:4:2:2; 

 anal segment reduced and not visible from above. The number of 

 large tubercles on each successive segment is, respective!}^, 6, 8, 8, 8, 8, 

 8, 8, 6, 2. On the fourth abdominal segment the two dorsal tubercles 

 coalesce and four tubercles are ventral. On the genital segment 

 all six coalesce. On the anal segment the two tubercles are ventral. 

 Each tubercle, though but shghtly elevated, is defined by its chitinous 

 reticulation and by two to four stiff serrulate setae of two forms 

 (fig. 239). The minute cuticular tubercles are conical (fig. 239) and 

 frequently clustered. Legs short and stout, with stout curving setae. 

 Ungues (fig. 240) ahke, apicaUy curving, prominently unidentate at 

 the base of the inner margin. Length, 1 .4 mm. 



In the males (fig. 6) the abdomen gradually dilates, and the 

 breadth is to the length as 1:2.8; the females are oval-cyhndrical, 

 with breadth to length as 1:2. 



In my original description of this species I stated, ''tibiae with 

 a subapical pair of appendages, pyriform in outline." These are 

 shown in figure 240. They are not present on all of my specimens, 

 but occur on many of them, singly or in pairs, near the end of the 

 tibiotarsus. • Axelson ('036, p. 3) failed to find them in his seven 

 Siberian specimens; and Caroh (12, p. 365) regards them as pori- 

 thecia of Laboulbeniaceae ; hence I admit that they may be parasitic 

 fungi. 



The 35 cotypes of Neanura ornata were collected at Sitka, Alaska, 

 by the Harriman Expedition; and the species has since been recorded 

 from Siberia by Axelson. 



Cotypes.— Csit. No. 5435, U.S.N.M. 



NEANURA QUADRIOCULATA Guthrie. 

 Plate 25, figs. 241-245. 

 Neanura quadrioculata Guthrie, 1903. — Barber, 1913. 



"Entirely white except the two black eye patches on each side of 

 the head, each eye patch containing a single ocellus." The eyes are 

 shown in figures 241 and 242. Postantennal organs absent. Anten- 

 nae shorter than the head; last two segments confluent. Olfactory 

 .hairs of fourth antennal segment eight in number: six inner and two 

 outer, including a stout semicircular giant-hair, as in figure 243. 

 Third antennal segment with an anterior dorso-lateral oKactory hair 

 (fig. 243). Mouth parts piercing-suctorial, projecting in a con- 

 spicuous cone (fig. 244). Mandibles and maxiUae styliform; the 



