1863.] 
291 
on each side of the second segment a large cuneiform yellow spot pointed 
within and almost meeting on the disk; third segment with a narrow 
yellow fascia interrupted in the middle and slightly indented on each 
side posteriorly * fourth and fifth segments also with a narrow yellow 
fascia not interrupted in the middle, but deeply indented anteriorly on 
each side; anus yellowish, hairy; beneath piceous, immaculate. Length 
5 lines. 
Male. Differs from the female as follows :—Form rather more slen¬ 
der ; the sides of the face, the clypeus, labrum, mandibles except tips, 
orbits of the eyes beneath and the scape of the antennae in front en¬ 
tirely yellow; the flagellum beneath ferruginous; no spot at the sum¬ 
mit of the eyes, a lunular yellow spot on the pleura beneath instead of 
the ferruginous interrupted circle; legs fulvous, except the posterior 
femora within which are black, and the tibiae which are as in the fe¬ 
male. Abdomen more elongate, the yellow spots on the first segment 
above assume the appearance of lunules, being rounded on their ante¬ 
rior margin and obtusely indented on the middle posteriorly and con¬ 
nected on the disk by an indistinct dark ferruginous line, as also are 
the spots on the second segment, the band on the third segment is 
scarcely interrupted; the sixth has a broad yellow fascia, interrupted 
on each side anteriorly, and the anus is black, with the tip bifid j be¬ 
neath blackish-piceous with a yellowish fascia on each segment, which 
is distinct on the disk and subobsolete on each side, where it is 
broadly excavated anteriorly; apical segment with a small yellow spot. 
liOngth 5 lines. 
Hah. Illinois 9 , Connecticut % . Two specimens. Coll. Ent. Soc. 
Phila. and Mr. E. Norton. 
For the 9 , the Society is indebted to Benj. D. Walsh, Esq., of Rock 
Island, Ill. 
9. N. placida n. sp. 
Female. Head black, finely and densely punctured; sides of the 
face and orbits of the eyes obsoletely, yellow; clypeus, except the an¬ 
terior margin, labrum and the base of the mandibles yellowish-ferrugi¬ 
nous. Antennae black above; beneath piceous, tinged with ferrugi¬ 
nous towards the base. Thorax black, densely and finely punctured ; 
two lines on the collar, the tubercles except a black indentation in 
front, a broad line on the scutellum which is subbilobate, a line on the 
A 
