44G BKITISH OHlBATIDiE. 



hind margin by about half the length of the tarsi ; the 

 proximal ends of the tibiae are considerably narrowed, 

 giving the leg an effect of increasing in thickness both 

 forward and backward from this point (see figs. 13, 

 14). 



Abdomen a shortish oval, nearly elliptical. The 

 posterior end the broader ; the antero-lateral angles 

 are very slightly thickened and produced, giving the 

 effect of the progaster being a little truncated ; it is 

 very much arched. The whole dorsal surface is covered 

 with thicldy scattered raised dots, which in prepared 

 specimens seem to be on the surface layer of the 

 cuticle only, and to stand above depressions in the 

 reticulation of the deeper layers. These dots average 

 about 100 to the millimetre, and when a piece of the 

 cuticle is examined with a high power it will be seen 

 that the ridges of the deeper reticulation between the 

 dots are pierced by a single series of extremely fine 

 punctures. On each side of the abdomen, at the ex- 

 treme edge, and a little behind the middle, is a con- 

 spicuous chitinous projection which is thickest where it 

 joins the abdomen, then gradually narrows slightly 

 until close to the tip, where it suddenly widens a little, 

 like the neck of a wine-bottle. This projection is 

 tubular, and communicates internally with a mem- 

 branous sack, the expulsory vesicle (PI. F, fig. 15). 

 There are two longitudinal rows of strong setiform, 

 almost rod-like, hairs on the notogaster, and a border 

 of similar hairs nearer the margin, and one or two 

 extra pairs at the posterior end. The arrangement of 

 the notogastral hairs is such that they may be said to 

 be placed in transverse rows, as Nicolet says, if this 

 mode of description be preferred. The whole ventral 

 surface is coarsely dotted. The dorsal plate is con- 

 siderably sufiBexed on to the ventral side. The genital 

 and anal plates are large, nearly close together ; the 

 genital almost round, the anal oblong, larger and 

 slightly wider than the genital. 



