4 INSECTS INJURIOUS TO SUBTROPICAL FRUITS. 
DESCRIPTION AND LIFE HISTORY. 
THE ADULT. 
The adult female of the orange thrips is a small, four- winged, 
orange-yellow insect, which moves very rapidly by running, leaping, 
and flying. The mouthparts, which are suctorial in nature, form a 
sharp cone projecting from the underside of the head. The adult 
male is smaller than the female and much more rapid in its 
movements. 
The original description of the adult female by Moulton a is as 
follows : 
Euthrips citri n. sp. 
Measurements : Head, length 0.75 mm., width 0.15 mm. ; prothorax, length 0.09 
mm., width 0.18 mm. ; mesothorax, width 0.24 mm. ; abdomen, width 0.25 mm. ; 
total body length 0.86 mm. Antennae : I, 12,u ; II, 36^ ; III, 39/i ; IV, 39^ ; V. 30/* ; 
VI, S4fx; VII, 6a*; VIII, 12 M ; total, 0.205 mm. Color, yellow to orange-brown, 
with thorax and segment 2 of antenna? more noticeably orange-brown. 
Head twice as wide as long, retracted considerably into the prothorax, 
broadly rounded in front, with only slight depressions to receive the basal 
joints of the antennae ; two spines on anterior margin, other spines not conspic- 
uous; cheeks almost straight and parallel. Eyes large, occupying almost one- 
half the length of the head, prominent ; pigment deep red to purple ; facets of 
eyes large, eyes pilose. Ocelli subapproximate, margined inwardly with yel- 
low-brown crescents. Mouth-cone short, reaching almost to posterior margin 
of prothorax, broadly rounded and with black spot at tip; maxillary palpi 
3-segmented. Antennce 8-segmented, with segment 2 orange-yellow, other seg- 
ments uniformly light brown ; segmeuts 2, 4, 5, and 6 almost equal in length ; 
style about one-half the length of segment 6. All spines inconspicuous; sense 
cones transparent. 
Prothorax about twice as wide as long, posterior angles broadly rounded ; 
with long brown and outer small spine at each posterior angle, other spines not 
conspicuous. Mesothorax largest and with anterior angles broadly rounded. 
Legs light yellow-brown, with tarsi lighter but dark brown at the tip ; spines 
on legs brown. Wings present and fully developed, forewings broadest near 
base and pointed at tips; with the ring vein and a single longitudinal vein 
which divides at about one-third the length of the wing from the base, the 
anterior part running parallel and approximate to the anterior part of the ring 
vein, and ending abruptly near the tip, the posterior paralleling and approach- 
ing the posterior part of the ring vein and ending about one-half the wing's 
length from the end, each branch with a dark-brown marking immediately at 
its tip. The costa bears a row of about 29 regularly placed spines. Other 
spines placed as follows : A group of 5 near base of median longitudinal vein ; 2 
on either side of where second vein branches from the first, and 3 scattered 
spines about equidistant on each branch vein and in each case one of these 
spines immediately at the end of the vein ; several rather long spines on scale. 
Veins of the forewing unusually strong and conspicuous, somewhat orange 
colored near base but fading to yellow near tip. Membrane of wings trans- 
parent. 
a Loc. cit. 
