1. putus 



257 



beyond the marginal fold are seen dorsally five distinct posterior ridges 

 (in reality borne by the ventral plates) bearing tufts of strong, equal, 

 white hairs or bristles, the external ridges being twice the length of the 

 three median. Venter : Sexual orifice facing the first intercoxal space ; 

 pregenital plate semilunar, median plate elongate, rather narrow, anal 

 plate rounded in front, its sides sub-parallel, delimiting the median 

 tuft of hairs ; adanal plates with very convex external border ; the anal 

 and adanal plates deeply punctate. Spiracle very large, very near 

 coxa IV, subcircular. Capitulum very small ; base twice as broad as 

 long, broader in front, the posterior border straight, the anterior border 

 excavate ; palps horn-like and curved upwards, tapering to their 

 extremity, article 1 conspicuous dorsally, article 2 beset with stiff 

 bristles, longer than article 3, the articulation between articles 2 and 3 

 very obscure; article 4 projects ventrally from the base of article 3. 

 Hypostome very rudimentary, short, bifid, with faint indications of six 

 teeth, the anterior more external. Legs: coxae contiguous, unarmed, 

 very convex ventrally ; all the articles except the tarsi of legs 1, 2 

 and 3 extremely stout and strong; leg 4 conspicuously thinner and 

 somewhat longer. All the tarsi weak and tapering gradually ; tarsi 2-4 

 with small terminal spur ; pad one-third as long as claws. 



Fig. 254. I. putus i : dorsum, venter and side view ; H, hypostome, spiracle. The apron 

 or flap over the sexual orifice is indicated by the letter F in the middle figure. From 

 specimen (N. 968) found on cliffs at Bhosilly, Gower, Glamorganshire, 1909, by 

 Dr J. W. W. Stephens. (Original, G. H. F. N. del.) 



