2, On the Anatomy and Bionomics of the Red Cotton 
Bug, Dysdercus cingulatus (Fabr.). 
By Hem S1neu, M.Sc. (Punjab), Assistant Sitnine of 
Entomology, Punjab Agricultural College, Lyallpur 
a) may 
CoNTENTS. Page 
Introduction 6 a st 15 
aaa _ General Account fs zie es 17 
oo al a a a ne 18 
"He ad a we a 18 
‘Enorax - .. Sv i Sod 3 21 
Abdomen ‘2 re a on 25 
II. Anatomy-Internal ws ee + ne 2 
Digestive ct ees ae $3 ie at 28 
Salivary glan * <“ 29 
Putas or es Endoskeleton.. me 3 31 
Reproductive System es 31 
Nervous System - 33 
Respiratory System ee . 
Stink Glands ae 2 35 
ircul y os a a - 35 
HI. ee and Life-History . ‘ ve 35 
rature referred to in the 
vist ‘of terms — in ihe shee and their explane- 
on 
isenesils employed i in the diagrams se es 40 
INTRODUCTION. 
The material for study was collected at Lahore and Pusa 
during the months of March to August of 1919 and 1920. Speci- 
mens were chloroformed or killed by immersing in 90% alcohol. 
For studying the external features, 70% alcohol her used 
as a preservative. It had no effect on the red pigment of the 
individual, nor was there much crumbling and fara of 
the different sclerites. Organs and tissues were cleared by 
treatment with 5% KOH for24-30 hours. Boiling in 10% KOH 
for a few minutes as suggested by some se eiakie Souk was not 
found to be satisfactory, since this process produced artificial 
lines and sutures on the tissues. Glacial acetic acid was em- 
ployed to get rid of the excess of the KOH. Then the organ 
was either mounted in weak glycerine or a permanent prepara- 
tion of this was made in canada balsam. If the sclerites had 
been made too transparent, a small quantity of picric acid was 
added to clove oil, to give a yellow stain. The forewings had 
to be dechlorified in order to show their veins distinctly. 
‘0 get satisfactory sections, of the head capsule, Awati’s 
procedure (1), with some modification was adopted :— 
