247 



Fig. 16. 



more dai-k browii or black on the al)dominal tergites. During each 

 moiill Ihe wliole liead of the iiymph is doiibled up undcr the lliorax ; 

 jii.sl as it is in Ihe embryo in the egg, when ready to halch. 



The nymphe in ail instars hâve an odd habit oC rnbbing one leg 

 on another, very much as the adnlt loinalc does when thickening 

 the wall of lier ootheca. Likc other bugs, Ihey clean the proboscis 

 by taking it l)etween ihe larsi of the forelegs, and drawing them 

 fi-om the hase to Ihc tip ot the proboscis, a few limes in succession. 



In llie (Ifth instar the clouring is slill much the same, but there is 

 rather more black on the abdomen; the tegmina are larger and 

 cover the anlei'ior part of the abdomen, 

 and ai'c nearly black. 'i'he legs in Ihis 

 instar are pale yellowish brown with 

 l)lack markings, especially on the fe- 

 mora; the I asal segments otthe antennœ 

 are markcd with black and pale yello- 

 wish brown; Ihe terminal segments are 

 wholly pale yellowisli-brown, exce[)t Ibr 

 a small black mai-king at tlie base, 

 near tlie ai-ticulation. The expansion 



dorsally oC the slernal plates of the abdomen is noticeablc in Uns 

 instar. 



Direclly aller the liflh and final moult, Ihe gênerai clour is pale 

 orange, the dorsolateral expansions of the abdomen clourless and 

 semitransparent, and margined lineiy with black. A black médian 

 line on the sternites, and a black triangular marking on each 

 ventral segment on each side, the apex merging in the médian 



black line. Legs very pale, 

 *^^I1 . . 



wilh two small black mar^ 



kings round the femora. 



Tegmina pale orange at the 



base, shading into paler 



yellow. fjyes black. Tlie 



colourof the freshiy moul- 



ted adult is in fact the same 



as thatof the last nymphal 



instar, and the bug does 



^''"" ^"' notattain full adult colou- 



ring for some four liours, the last i)ai'ts to beconic l)lack being the 



coxaî of the fore legs. 



The small, chitinous, bilid |»rocess on the sculellum (fig. 17), 

 hai-d and black in the adult, is, during the last nymphal instar, a 

 soft and tubular invagination of tlie cuticle, and is entirely concealed 

 within the tliorax; as soon as the old skin of the thorax splits, tliis 

 process issuddenly prolruded by blood-pressure, very much as the 



