12 BULLETIX 1016, U. S. DEPARTMENT OF AGRICULTURE. 
which is brown, 0.062 mm. in length ; metanotum pale except a narrow dark 
line on either side of the meson, 0.047 mm. in length. The coriaceous area on 
the thorax is broken on the meson and causes it to appear as though crossed 
by a pale line. 
Abdomen about the width of the thorax, though sometimes somewhat wider, 
the widest part being in the region of the fourth segment. Segments 1 and 2 
pale yellowish white, this color sometimes invading part of the third segment; 
remaining segments light red, darkening somewhat in older individuals. There 
is a minute, dark spot on the meson near the caudal margin of the fourth seg- 
ment and a similar one on the caudal margin on the meson of the fifth segment. 
In some specimens these spots are absent during the first instar. Tip of ab- 
domen black. 
Length, 0.889 mm. 
SECOND INSTAR. 
Fig. 2, 1. 
Head brown ; width, 0.314 mm. ; eyes, antennae, and beak as in first instar. 
Thorax, 0.513 mm. in width ; legs pale as in previous instar ; pronotum re- 
sembling previous instar ; mesonotum coriaceous over almost its entire surface ; 
metanotum with two brown coriaceous patches, one on either side of the meson, 
resembling large exclamation points ; otherwise the segment is pale. 
Abdomen, 0.502 mm. in width, widest in region of fourth segment. Seg- 
ments 1 and 2 pale; remaining segments darker red than in preceding instar. 
The dark spots on the fourth and fifth segments are somewhat larger than in 
the preceding instar, but have not taken on any definite shape. Tip of the abdo- 
men black, as also the area around the anal opening. 
Length, 1.287 mm. * 
THIRD INSTAR. 
Fig. 2, c. 
Head dark brown ; width, 0.399 mm. ; eyes very dark red ; proboscis amber 
except at tip, which is almost black ; segments 3 and 4 of antennae black, 1 and 
2 amber, segment 4 twice, as long as 2 and 3 and over three times as long as 1 ; 
points of articulation pale, somewhat translucent. 
Thorax, 0.518 mm. in Width; legs amber, somewhat dusky on the femora; 
pronotum, mesonotum, and metanotum dark brown and coriaceous over the 
whole surface; wing pads discernible on the caudal border of the mesonotum 
near the outer edges, in the form of a slight extension or outgrowth of the 
coriaceous covering in this region. 
Abdomen, 0.596 mm. in width, widest in region of fourth segment. Segments 
1 and 2 pale whitish, remaining segments a dull red, with mottlings of a darker 
color here and there. The two spots on the abdomen assuming a definite shape 
somewhat resembling a flaxseed in outline, one spot on the caudal margin on 
the meson of the fourth segment and the other on the meson of the fifth seg- 
ment extending partly over the suture of the fifth and six segments. Tip of 
abdomen black. 
Length, 1.648 mm. 
FOURTH INSTAR. 
Fig. 2, d. 
Head, eyes, antennae, and proboscis the same color as in the preceding instar ; 
width of head, 0.465 mm. 
Thorax, 0.654 mm. in width; legs same in color as in preceding instar; me- 
sonotum very narrow, only about half as long as the pronotum and only a 
