WINGLESS REPRODUCTIVE TYPE OF TERMITES 
The nearly mature third-form nymph of P. simplex. 
619 
The nearly 
mature third-form nymph of 5 mm. (fig. 16) has the following 
external characters: head and body white, or the abdomen may 
appear gray like a worker, the chitin of the head thin, the number 
of antennal segments eighteen, the compound eyes are very 
TABLE 2 
Comparison of third form and worker 
P. simplex 
THIRD FORM 
WORKER 
Head: 
Chitinase ic sace: 
SASS, See a 
Antennal segments...... 
Compound eyes......... 
lateraliocellises:n.4 05. 
Brontialvel sander 
Bev, Ao keel Bienen, se cee 
Jiawamiusclesi= sep so. see 
PISO aXe kent ee 5 ee Ne 
Thoracic plates. .... 
Salivary glands....:.... 
Abdomen: 
Hatiy tissues). aebisees. 
Reproductive organs.... 
Hoods aes ee eos 
Body length? : 2.2500. 
White 
Thin 
Medium sized 
18 
Medium sized 
Medium sized 
Small, probably glandu- 
lar 
Medium sized 
Degenerate (adult): 
Wingless 
Large, posterior margins 
not indented 
Large 
Slender 
White, opaque, 
times gray 
Enlarged in older forms 
some- 
Abundant 
Well developed, 
tional 
Wood, and probably also 
fed by workers 
5.5 mm. (young adult) 
func- 
slightly smaller and 
Yellowish 
Thick 
Small 
16 
Small 
Small 
A bilobed ocellus 
Small 
Normal 
Wingless 
Small, posterior margins 
indented 
Slightly smaller 
Swollen or blunt 
Transparent, showing in- 
testinal contents 
Not enlarged in older 
forms 
Very little 
Undeveloped, | non-func- 
tional 
Wood 
5 mm. (adult) 
less pigmented than those of the second- 
form nymph, lateral ocelli are present, the thorax is entirely 
wingless, the thoracic plates are large and the posterior margins 
are convex and not indented in the median line, the abdomen 
is tapering, genital appendices are present on the ninth abdominal 
