819 
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No. 145.] 
sides with numerous fine short hairs, with aslight vacancy between them at each of the 
joints. The feelers are yellow on their lower sides; there is a paler yellow spot be¬ 
tween the bases of the antennae and a deeper yellow transverse stripe at the base of 
the head both above and beneath. The thorax has a yellow stripe on each sideof ite 
middle, a transverse one at its base which is slightly interrupted in the middle, and a 
short broader one on each side under the wings; its base on the underside is white. 
The abdomen commonly has two slender yellow bands above, at the apex of the 
second and fourth segments, and a white line on each side of the tuft of hairs at its 
tip. The forward hips are yellow on their anterior face, the four others at their tips. 
The shanks are yellow at their tips, the hind ones have a yellow ring on their middle 
interrupted on the inner side, the other four have a large yellow spot on their ante¬ 
rior sides; their spines are white, their upper sides black at least on the basal half. 
The fore feet have a white ring at the apex of each joint and a broad white stripe 
upon the inner side; the middle and hind feet have a slender white line on their inner 
sides, which is often nearly obliterated, showing only a few white scales at the apex 
of each joint. The wings are transparent and glass-like with a slight tinge of smoky 
yellow; their veins, margins and fringe is steel-blue. The fore wings have a steel- 
blue band beyond the middle upon their transverse anastamosing veinlet, a slender 
yellow line upon their outer or anterior margin both above and below, and a similar 
line on the inner edge of their inner margin, the hind wings also have a similar line 
on the inner edge of their outer margin. 
The following varieties occur in this sex: 
a. The pale yellow spot between the bases of the antenn* wanting. 
b. The same spot enlarged and extending backwards to the neck. 
c. The abdomen without white stripes upon the sides of the tail. 
i. The abdomen without any yellow bands. 
e. The abdomen with but one band, that upon the apex of the second segment 
wanting. 
f. Three yellow bands, one on the apex of the fifth segment. Common. 
g. Four bands, one on the apex of each segment from the second to the fifth in¬ 
clusive, that upon the third segment often imperfect. 
The female differs from the male so much that it would not be supposed to pertain 
to the same species. The abdomen is of a long oval form instead of being slender 
and cylindrical, and is twice as broad across the middle as that of the male. This 
sex is of a glossy steel blue color with a purplish reflection in places and blackish upon 
the face, and upon the middle of the abdomen is a broad band of a bright glossy 
orange yellow color occupying the whole of the fourth and fifth segments* except 
upon the middle of the underside, where,at least on thefourth segment some orange 
scales often occur interspersed with the steel blue ones. The antenna; have nofiinge 
along their inner sides. The fore wings are opake and of the same steel blue color as 
the body, their tips and fringes being of a purplish tint both above and beneath. The 
hind wings are transparent broadly margined upon both sides and marked at the base 
with steel blue, the glass-like portion being crossed by five robust veins, and com¬ 
monly there are traces of a straw yellow stripe on the outer margin towards the tip. 
* Say desoribee the abdomen as having only tho fifth segment of an orange color, but in 
every apeciiaon whioh X have seen the fourth segment also is of this color. 
