40 SJÖSTEDTS KILIMANDJARO-MERU BXPEDTTION. 20: 3. 



like those of the outer ring; the pores are however situated behind the hairs in the 

 anterior half and in front of them in the posterior half. 



Finally there are in the centre of the shield 6 pairs of smajl hairs arranged 

 in two longitudinal rows of two and tvvo together. 



Ventral side (PL 3, fig. 11.) 



Tritosternum (PI. 3, fig. 8) of a peculiar shape. The basal part of the triink 

 is three times as broad as the rest and projects in two short, lateral teeth. The 

 trank, which ia two-jointed, the terminal Joint being only '/b of the basal one, nar- 

 rows slightly in the midde and widens again in the distal third. There is only one 

 median flattened slip, inserted in a deep, cup-shaped pore at the top of the trunk. 

 The slip, the proximal half of which is twice as broad as the distal one, branches 

 off into two minute lateral slips in the niiddle. 



Jngular shields (PI. 3, fig. 15). 



As far as I am aware of, no jugnlar shields have been found hitherto in the 

 Uro}Mdince. This depends on the fact that they, being entirely concealed beneath 

 the highly developed coxse of the first pair of legs, have been overlooked by the 

 aiithors. 



If we dissect carefullj' the rostrum and the first pair of legs, we find, on each 

 side of the tritosternum and covered completely, as well as the tritosternum, by the 

 coxse I, a hyalin, chitinous plate, which is attached only with its hind edge to the 

 soft portion of the cuticle between the coxse and the rostrum. The plates resemble 

 indeed in shape very much the mandibles of an insect, for instance those of a ter- 

 mite worker. They are flat and nearly triangulär in outline, with broad basis, and 

 get gradually thinner towards the median edge. The basal and lateral portion of 

 the plate is softer and thicker. The lateral edge is rounded; the median edge is 

 very thin and sharp and bears on the ventral side 4 — 5 small, perpendicular tubercles. 

 The edge itself has two largo teeth ; the anterior one has 2 — 3 very small teeth at the 

 tip: the anterior edge of the posterior one is straight, with small teeth placed at regulär 

 intcrvals ; behind this there is a rounded lobe, behind which the edge is slightlj' 

 concave. To judge from the position of these plates, there cannot, in spite of their 

 peculiar shape, be any doubt about their identity with the jugular shields of other. 

 Parasitidee. '. Otherwise they are structnres not met with, except in the Uropodince. 



Their shape suggests that they serve the purpose of effecting, together with 

 the coxae and the trochanter of the first pair of legs, a thorough closing as to 

 Protect the rostrum. 



The sternal shield (PI. 3, fig. 11) covers the whole space between the coxse 

 II, III and IV and the anterior half of the belly, and is finely punctured. 



The anterior edge is slightly concave, with a blunt median projection; the 

 antero-lateral corners project as far as to the middle of the anterior margin of coxa^ 



' This question I intend to iiivestigate furtlier, wlieii doscribing tlie collection of Uro^jodlnce wliirh 

 1 have brought home from Natal aud Zululaiid. 



