284 JOURNAL, B02IBAY NATURAL HISTORY SOCIETY, Vol. XII. 



6'^ Posterior inferior tingles not thickened and 



out-turned ; posterior half of terga finely 



punctured or smooth. 



a}^. Colour a deep olive-yellow spotted with 



black ; a large black patch on each side 



of the terga , distida, Poc. 



P*. Colour a deep olive-green or brown, often 



variegated, but without a large lateral 



patch on the terga. 



a^*. Anal tergite and posterior two-thirds of 



the others perfectly smooth and 



polished ; colour deep olive-green, 



mottled nltida, Poc. 



i". Anal tergite punctured throughout or at 

 least above. 

 a^^. Anterior half of the terga densely 

 pubescent in the adult (terga entirely 

 pubesoent in young) Dalyi, Poc. 

 6'°. Terga not pubescent, 

 a^^. Posterior half of terga (excepting 

 the anal) smooth and polished; anal 

 tergite without impression on its 

 anteriorinferior angle. /wwosa, Poc. 

 t'^ Posterior half of terga not polished, 

 dull, punctulate ; anal tergite with 

 a pitlike impression on its anterior 

 inferior angle, Davisoniy Poc. 



Explanation of Plate A. ■ - ' 



Fig. 1 ArthrosphcBra Wroughtoni : iiatural size. 

 , \a „ „ lateral view of second tergite. 



^^ \h „ „ posterior forceps of copnlatory 



organ. 

 Ic „ anterior forceps of copnlatory 



organ. 

 ,j 2 „ Thurstoni : natural size. 



2a ,, ,» lateral view of 2nd tergite. 



21) „ anterior foroepB of copnlatory 



organ. 



