22 Journal of the Asiatic Society of Bengal. [N.S., XIX, 
episternum called the parapleuron and lastly the peritreme, 
which is a small plate containing the spiracles. The notum is 
composed of the prescutum, the scutum, the geutellum and the 
post-scutellum forming a linear row. 
The thorax in Dysdercus cingulatus is well marked, 
jointed to the head by a soft neck, which is completely over- 
lapped by the prothorax. Its dorsal surface is large and 
convex, while the ventral is short and flat. 
Prothorax (Fig. 4b) is large, closely attached to the posterior 
part of the head and overlapping the anterior region of the 
mesothorax. 
The pronotum (PR.N.) is trapezoid in shape, 2:04 mm. 
broad in front and 3°2 mm. at the hind end, convex in the 
middle ; its deep red lateral margins being somewhat dilated 
and reflexed. It is a single undifferentiated piece, and accord- 
ing to Martin (15) corresponds to the scuto-scutellum only, the - 
pronotum being devoid of post-scutellum owing to the absence 
of wings in this segment. 
The anterior margin of the notum is white (1°3 x 2°53 mm.) 
which. with similar portions on the pleuron and sternum, forms 
the apical structure (AP. ST.). Behind the latter is the deep 
red pronotal callosity. The rest of the notum is chrome yellow 
and leathery in texture. 
The pleuron (PI.1) is broad above (2°09 mm.) and narrows 
down to meet the sternum. The ventral margin of the pleuron 
is white and overlaps the base of the coxa with the coxal cleft 
(Cox. CL.1) in the middle. In the middle the pleuron bulges 
out to accommodate on its inner wall the expanding muscles of 
the first leg. The posterior margin of the pleuron is white and 
overlaps the anterior margin of the mesopleuron and the Ist 
thoracic spiracle. 
Prosternum (Fig. 2, St.1) is a flat almost rectangular plate 
1mm.long. It iscomparatively narrow in the posterior region, 
where it lodges the coxae. 
Mesothorax is the best developed of the three thoracic 
segments owing to the attachment of the first pair of wings. 
It is comparatively longer dorsally, overlapping a part of the 
metanotum and is delicately connected to the prothorax. 
The mesonotum (Fig. 3c) is a conspicuous piece whose an- 
terior half—greatly deflected and covered by the pronotum—is 
rectangular in shape, with a deep median furrow, and is com- 
posed of the prescutum and scutum. Behind the scuto-scutel- 
lum and separated from it by a wide shallow groove, is the pro- 
minent triangular scutellum (SL). The latter is deep red with 
black margins and is supported laterally by stout chitinous 
ridges—the frenum—which reach the base of the wings. The 
post scutellum (P. SL.2) is a stout, transverse, curved sclerite 
slightly visible externally, being covered by the scuteilum and 



