282 [Senate 
black band surrounding the head, and interrrupted only below at the 
mouth, thus resembling a horse shoe in their figure. The face 
is pale yellow. In its centre, and contiguous to each other, are two 
pale yellow tubercles or spherical eminences, more or less conspicu¬ 
ous, on which the antennae are inserted, and which are by some re¬ 
garded as forming a joint of these organs, in addition to the number 
commonly stated. The anlenn(E are of a deep brown or black color, 
less intense than the eyes. They are of about the same length as 
the body, and composed of twelve joints. Each joint (Plate, fig. h ) 
is commonly oblong, with a marked contraction in its middle, a shape 
which is sometimes designated as “ coarctiform,” and is surrounded 
with a whirl or row of hairs near its base, and another near its apex.* 
The joints are ordinarily about thrice as long as they are broad, their 
diameter being but little less than that of the legs. They are connected 
together by a slender thread intervening between each joint, and about 
a fourth as long as the joints themselves. The two palpi are pale 
yellow, and clothed with shortish hairs: each is composed of four oval 
joints; the one terminal being longer, but of the same diameter with 
the preceding. 
The thorax is of a pale yellow color; its upper side commonly 
tinged with fulvous brown, which sometimes, though rarely, forms 
three vittae or longitudinal spots forward to the middle. It is of an 
ovale form, its greatest breadth being immediately back of the wing 
sockets. Its vertical diameter much exceeds the transverse, as is 
common in most species of Tipulidce, the breast jutting down far 
below the level of the head and abdomen. The poisers are oval, 
honey-yellow, their pedicels with a strong notch in the middle of 
their anterior sides. 
The abdomen throughout is of an orange color, more inclining to 
red than to yellow. Its broadest part scarcely equals the thorax in 
•Not unfrequently, however, singular anomalies occur in these joints. Thus in 
some the contraction will be so considerable as to cause the segment to appear like 
two globular joints slightly but distinctly separate from each other; whilst other seg¬ 
ments of the same series are abbreviated and dilated, the usual contraction thus becom¬ 
ing obsolete, and the joint taking on a short cylindrical form. It would thus seem as 
though we, in the female, met with twenty-four joints of the male attennaj in a 
modified or imperfectly developed condition; that what appears as a single oblong 
coarctiform joint, is in reality two joints united. This would give but a single whirl 
of hairs to each joint, as is common in most of the species of this genus. 
