THE RED-BANDED THRIPS. 21 
CLASSIFICATION. 
When first described this insect was put in the genus Physophus 
and remained there until 1908, when Franklin placed it in the genus 
Heliothrips because of its structure. H. Karny a , in a revision of the 
genus Heliothrips, made this species the type for a new subgenus, 
Selenothrips. However, for the present, the writer prefers to refer it 
to the genus Heliothrips in its old sense. This species is readily 
placed in this genus by reason of the downward curved ovipositor, 
the reticulated structure of the body, and the 8-segmented antennae 
with segment 8 longer than 7, and the spines on the wings pointed. 
DESCRIPTION. 
THE ADULT. 
(PL V, fig. 1.) 
As an adult this insect can be separated from others associating 
with it by the characters given above and by the black body, dark 
wings, the reddish band, evident in the first three segments of the 
abdomen, and the red color of the anal segment. The adult female 
(Pi. V, fig. 1) is about one twenty-fourth of an inch long (1.1174 mm.) 
and quite stout. The color is dark brown or black. 6 The male is 
much smaller and is apparently not very commonly collected. When 
the adults first emerge, the colors of the body are light, but in a short 
time these darken and the mature colors appear. 
THE EGG. 
The egg was not observed by the writer, but was described by F. W. 
Urich, 24 as follows : 
As dissected out of the female the egg is kidney-shaped, 0.255 mm. long and 
0.105 mm. wide, with a very thin shell and transparent. 
The eggs are inserted by the female into the tissues of the mango or 
avocado leaves and in the case of the cacao, as observed by Urich, in 
the leaves and pods of the bean as well. 
THE FIRST-STAGE LARVA. 
The following description was made while the larva was less than 
a day old and before it had begun to feed: 
Length about 0.25 mm. and nearly six times as long as wide. General shape fusi- 
form; head, antennae, and legs very large in proportion. Head quadrate, rounded in 
front, light yellow in color; ocelli absent, eyes red, antennae seven -join ted, hyaline; 
legs and body hyaline; segments 1 and 2 of abdomen crossed by a bright red band, 
anal segment red; end of abdomen with four long hairs about four times as long as 
segment 10. 
a Ent. Rundschau, Jahrg. 28, pp. 179-181, December, 1911. 
& For full description of this species see Franklin's paper, is pp. 719-72X 
57371°— Bull. 99—12 2 
