[June 
in color, it differs as follows:—Head entirely black except the outer 
and inner orbit of the eyes above the antennae, a transverse spot on 
the anterior margin of the clypeus, and the sides of labrum at base, 
which are yellow; antennae above blackish with the third, fourth and 
fifth joints yellowish, beneath reddish-yellow with the base and apex 
black. Prothorax not so broadly margined anteriorly with yellow, but 
separated in front of mesothorax by a black line; no yellow spot be¬ 
neath the base of the wings. Mesothorax and scutellum entirely black. 
Metathorax with the posterior angles slightly tipped with yellow. Legs 
yellow with the femora entirely black except the extreme tips. Wings 
rather darker. Abdomen not so broadly banded above with yellow; 
the bands of the first four segments resemble those of the male, that 
on the basal segment being interrupted in the middle; the band on 
the fifth segment is deeply indented on its anterior margin, and with 
a small transverse black spot on each side; apical segment with a large 
yellow spot on each side, confluent with the lateral margin of the seg¬ 
ment; abdomen beneath with two small yellow spots on the disk of the 
second segment, and a.narrow yellow band, more or less interrupted in 
the middle, on the third and fourth segments, and a small yellow 
spot on each side of the fifth segment. 
Variety. (Plate 4, fig. 2.) Differs from the female above described 
as follows:—Sides of clypeus and labrum margined with yellow; the 
transverse yellow spot on the anterior margin of the clypeus larger; a 
yellowish spot on the mandibles near the base. Prothorax with the an¬ 
terior margin entire, but the yellow is produced posteriorly into a point 
on each side of the mesothorax in front; the yellow spot beneath the 
base of the wings is present, as in the male. Mesothorax profoundly 
impressed on each side between the wings; the yellow spot on each 
side near the wing-scale is present, but much larger than in the male. 
Scutellum with a yellowish bilobed spot posteriorly. Metathorax with 
the posterior angles strongly produced and yellow. Legs colored as in 
the male. Wings stained with fuscous towards the apex. Abdomen: 
the second, third and fourth segments have the yellow bands with the 
anterior margin more or less indented in the middle, but on each side, 
instead of being squarely indented, the yellow band encloses a trans¬ 
verse black spot, which is largest and nearest to the disk on the second 
segment; the band on the fifth segment is very broad, deeply and some- 
