THE ORANGE THRIPS. 5 
Abdomen ovoid, tip conical, all spines, excepting a very few at tip, incon- 
spicuous. 
Described from many female specimens collected from orange foliage and 
fruit at Exeter, Tulare County, Cal. 
The males are similar to the females, but smaller and more active, 
with the orange-colored testes prominent. 
THE EGG. 
The egg is a bluish white, bean-shaped object measuring from 0.2 
mm. in length to about 0.075 mm. in width, with a very thin shell. 
THE LARVA. 
First-stage larva. — Length 0.041 mm. ; width of mesothorax 0.011 mm. ; 
general shape fusiform. The antennae, head, and legs are large and unwieldy 
in proportion to the rest of the body. Color translucent white. Antennae, length 
0.015 mm. ; distinctly 4-segmented ; I short, cylindrical ; II more than twice as 
long as I, slightly urn-shaped, longer than wide; III about as long as II, 
obtusely fusiform ; IV about as long as the other joints combined, fusiform, 
very finely drawn out at the distal end. Segments II, III, IV (II very ob- 
scurely) ringed, the distal rings on segment IV appearing as segmental 
divisions. A few fine hairs present on all segments, most numerous on IV but 
not very conspicuous on any of the segments. Head subquadrate ; eyes reddish- 
brown. Abdomen gradually tapering, 10-segmented, first 8 segments subequal; 
IX and X large and more abruptly tapering, hairs inconspicuous. Legs stout, 
femora and tibiae nearly equal in length, tarsi one-jointed, ending in a single 
claw. 
Second-stage larva. — Length 0.9 mm. ; head length 0.1 mm. ; width 0.083 mm. ; 
length of antenna? 0.175 mm. ; width of mesothorax 0.266 mm. ; width of 
abdomen 0.3 mm.; Antennw, I, 2.a ; II, 3^; III, 9^; IV, 45/t; V, 9^; VI, 15/*; 
color orange-yellow. In shape similar to first-stage larva except that the 
abdomen is oval to ovate and generally more robust. Head quadrate, small in 
proportion to body, eyes reddish. Antennae apparently 4-segmented under 2/3 
objective, but under 1/6 objective distinctly 6-segmented, the chitin not extend- 
ing into the fifth and sixth segments ; I short, conical, about as broad as long ; 
II cylindrical, broader than long and slightly longer than I ; III obtusely 
spindle-shaped, about twice as long as broad and about as long as I and II 
combined ; IV obtusely spindle-shaped but blunt on the distal end, about as 
long as III ; V very short and thick, slightly broader than long, about one- 
fifth as long as IV ; VI cylindrical, longer than broad, about one-third as long 
as IV. Abdomen oval to ovate, 10-segmented, the last segment tubular. Legs 
short and stout, hind femora and tibiae about equal, hairs everywhere incon- 
spicuous except a few under 1/6 objective, which are the most prominent on 
last segments of antennae. 
THE PUPA. 
First-stage pupa.— Length 0.56 mm.; width of head 0.15 mm.; width of 
mesothorax 0.18 mm. ; width of abdomen 0.25 mm. ; antenna?, length 0.2 mm. 
Color pale translucent yellow ; antennae, legs, and wing-pads lighter. Shape 
similar to advanced first-stage larva; abdomen elongate ovoid. Antennae pro- 
jecting cephalad, 4-segmented; I short, thick, slightly wider than long; II ob- 
tuse, urn-shaped, about as wide as long; III obtusely spool-shaped, about as 
78562°— Bull. 99, pt 1—11 2 
