40 INSECTS INJURIOUS TO FORESTS. 
During this final molt the females of nymphs of both the first and 
second forms normally lose the genital appendices; that is. the 
genital appendices are present in nymphs of both sexes before this 
molt, but afterwards only in mature winged males and supplementary 
kings, developed from nymphs of the second form; these appendices 
can be readily seen on the cast skins. In egg laying complementary 
queens of Termopsis angusticoUis (with no indication of wing pads), 
genital appendices were present, though absent hi true queens. 
On April 25, 1912, at Falls Church, Ya., molting nymphs (flavipes) 
of the second form were found. The progressive development of 
over 100 nymphs was noted, and apparently the molting is similar to 
that of nymphs of the first form. Before the quiescent stage is 
reached, the nymphs assume a straw-colored hue. Various stages of 
molting nymphs were observed through April 28. After the molt, 
the head and prothoracic segments darken, especially on the borders. 
The abdominal segments also darken. Sometimes there are gravish- 
black, longitudinal, pigmented markings on the head. Some of the 
nymphs have very short wing pads, mere buds, while in others the wing 
pads are more elongate, the pair on the metathorax reaching down to 
and slightly overlapping the (apparent) second abdominal tergite. 
This difference can be seen in supplementary or neoteinic reproductive 
forms and illustrates the fact that the growth of nymphs of the first 
form is arrested in various stages of development, as does (?) the 
presence of genital appendices in complementary queens of Termopsis. 
Sometimes, due to unfavorable moisture conditions, there is an 
abnormal development of nymphs of the first form. Individuals 
may be observed with partial pigmentation to the chitinized parts, 
acquired before the quiescent stage or before the wings are unfolded; 
that is, the wings may be in various stages of development, from the 
opaque-colored, elongate whig pads to partially unfolded, or unfolded 
but still crumpled, wings. There is great individual variation in 
the manner of molting. Adults with mature body pigmentation but 
with distorted, poorly developed wings, or even with opaque wing 
pads, have been observed emerging from the parent colony at swarm- 
ing time. A swarm 6 of flavi pes occurred at Falls Church, Ya., on 
May 8, 1912, and another on April 25, 1913, while in the case of 
virginicus the swarm occurred on June 1, 1913. 
This quiescent stage, or u Euhestadium," has been described by 
Hagen. c He states (in regard to the final molt of nymphs of the 
first form) that the skin bursts on the prothorax: and in order to 
a Grassi and Sandias. Op. cit., p. 306. 
& It is from 7 to 10 days after the last sexed adults in colonies have acquired wings 
and mature pigmentation that the swarm occurs. 
c Hagan, H. A. Monographie der Termiten. Linnaea Entomologica, v. 12, 
p. 337-338, 1858. - . : 
