188 Transactions of the Society. 



54. NoTHRus sEGNis. Herm, PI. V. Fig. 4. 



Notaspis segnis. Herm. 94. 

 Nothrus segnis. Koch, fasc. 30, pi 1. 



„ furcatus „ Nymph, fasc. 30, pi. 3. 



„ ventricosus. „ fasc. 29, pi. 17, 29 adult without 



cast skin ? 



Average length about 



„ breadth „ 



„ length of legs, first pair „ 

 „ „ „ second 



„ „ „ third 



» ,, „ fourth 



Colour yellow brown, legs a little darker, whole surface thickly 

 covered with raised dots. 



Cejjhalothorax flat and broadly conical, deeply notched for 

 insertion of first pair of legs, depressed below the abdomen, central 

 part near abdomen raised, and from the anterior lateral part of 

 this elevation two vague irregular ridges run forward. Stigmata 

 much raised, far apart, and set far forward. Stigmatic hairs very 

 short, sloping forward, ends small and of a short pyriform shape. 

 At each side of the rostrum is a long apophysis projecting forward, 

 the outer edge bearing a blade-like expansion which does not reach 

 the tip ; from the end of the apophysis springs a large hooked spine, 

 those from the two sides meeting or crossing. A pair of much 

 smaller projections, nearer the median line, bear similar spines. The 

 whole of these arrangements are generally so blocked up with dirt 

 that they are difiicult to make out. 



Ahdomen not vaulted either way, but slightly broadest in the 

 middle ; it is between three and four times as long as the cephalotborax 

 and its sides are slightly curved ; the anterior margin is markedly 

 raised, and bears four very small hairs arising from tiny papillae ; it 

 is straight and at right angles to the sides, the hind margin also runs 

 nearly at right angles to the sides, but is slightly concave ; at each 

 hind corner is a triangular projection pointing a little outward, and 

 about half-way from the tip of this, on the inner side, springs a 

 smaller apophysis bearing a spatulate spine. The true form of the 

 posterior margin is however entirely concealed in consequence of 

 the adult carrying the posterior part of the last nymjjbal skin 

 which only however covers a narrow strip of the hind margin of 

 the body, but projects beyond it in a broad, semi-opaque, white 

 band, with an irregularly conical tail at each corner which contains 

 the triangular projection, apophyses, and spine of the real body, as 

 though it were a bag drawn over them, and a narrow strip of the 

 same nymphal skin usually forms a lateral margin to the body. 

 There are three fine, short hairs, like those on the anterior margin 



