APTERYGOTA 89 



NEANURA ORNATA sp. nov. 



(PI. IV, fig. 2 ; PI. VI, figs. 14-18.) 



White (fig. 3). Head (fig. 14) slightly longer than broad, rounded 

 triangular. Eyes (fig. 14, e, <?, e) not more than three on either side, 

 in longitudinal alignment ; two are close together and immediately be- 

 hind the base of the antenna; the third is considerably behind these. 

 The eyes are rudimentary ; they lack pigment, and even the cornea, 

 especially of the posterior eye, is frequently indistinguishable. Post- 

 antennal organs absent. Antennae (fig. 15) barely more than half as 

 long as the head, with segments related as 5:4:4:6; basal segment 

 stout, globose, reticulate ; second and third globose, slightly or not at 

 all reticulate ; fourth conical, reticulate, the minute tubercles 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 

 setigerous, reticulated areas. Buccal cone as in figure 16. Body 

 segments related in length as 3:4:5:6:^:c;:4:3:2; apical seg- 

 ment reduced and turned under ; the number of large tubercles on each 

 successive segment is, respectively, 6, S, 8, 8, 8, 8, 8, 6, 2 ; on the 

 fourth abdominal segment the two paramedian tubercles coalesce, 

 while four are ventral ; on the penultimate segment all six coalesce 

 and on the apical segment the two tubercles are ventral. Each 

 tubercle, though but slightly elevated, is defined by its chitinous retic- 

 ulation and by two to four stiff serrulate setae of two forms (fig.^iy). 

 The minute cuticular tubercles are not hemispherical as in other 

 species of the genus, but are conical (fig. 17) and frequently clustered. 

 Legs short and stout, with stout curving setie ; tibia; with a subapical 

 pair of appendages (fig. 18), pyriform in outline; claws (fig. 18) 

 alike, apically curving, prominently unidentate at the base of the inner 

 margin. Length, 1.4 mm. 



As in N. gigajitea^ there are two forms, probably the sexes ; a 

 narrower kind (fig. 2) with abdomen gradually dilating, with average 

 breadth to length as i : 2.8, and a broader form, oval-cylindrical, in 

 which breadth : length ^1:2. 



Type. — Cat. No. 5435, U. S. Nat. Museum. 



Described from thirty-five types, Sitka, June, 1899 (No. 71). 



Nea7iura orriata docs not closely resemble any described species 

 but recalls in its ocular characters an East Ijidian species, N. fortis 

 Oudm. (Oudemans, 1S90, p. 91 ; Schaffer, 1898, p. 399). 



