Mr. R. S. Bagnall on new Thtjitanoptera. 405 



differs in the structure of the lateral al)doinii)al j)rocesses, as 

 may be seen by the accoinpaiiyiu"^ table and rough figures. 



rncess 

 (111 

 ^ ineut 



/. spectrum, ^ . 



A • 4. Approximate leiis-th 



Approximate 'Jl u • *i 



-^^ - - of spine or bristle 



leiiffth of 

 process. 



compared with 

 length of process. 



5 times as long as Spiiie 



breadth at apex. 0*3 as long. 

 4"5 ,, ,, Spine 



about 0'-4') as long. 

 4 ,, „ Slender spine 



0'8 as long. 



3 ,, „ Bristle 



3-0 as long, 

 3-5 „ „ Bristle 



2'5 as long. 



4 „ „ Spine 



about 0"o as long. 

 5"G „ „ Spine 



about 0-35 as long. 



I. lacertina, J 



Length of 

 process. 



Length of 



spine or 



bristle. 



As long as breadth Spine 



at apex. 20 as long. 



About 2'0 as long. Bristle-spine 



3-0 a.s long. 

 About 1"5 as long. Bristle 



6'0 as long. 

 As long. Bristle 



6'0 as long. 

 Slijrhtly longer Bristle 



than. G"0 as long. 



About 2"0 as long. Bristle 



4*0 as long. 

 Spine 

 About 2'5 as long, about as long. 



Fior, L 



Tis. 2, 



Fig. 1. — Idolothrips marginata, Hal., c?. 

 Fig. 2. — Idolothrips lacertina, Hal., J . 



Left lateral processes of second (a), third (b\ and eighth (c) 

 abdominal segments. 



