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22
BULLETIN OF THE UNIVERSITY OF NEBRASKA STATE MUSEUM
emarginate anteriorly at middle (Figs. 43-44).
Dorsal color reddish brown . . . Oiceoptoma
A. Prothoracic tergite deeply emargiate
anteriorly (Fig. 43). Thoracic and ab-
dominal tergites 1-8 with lateral margins
pale, pale areas with small, dark, spots
or oblique lines (Fig. 43) . . . . . . . . .
. . . . . . O. novaboracense (Forster)
A’. Prothoracic tergite shallowly emarginate
anteriorly (Fig. 44). Meso- and
metathoracic tergites as well as abdominal
tergites 1-8 with pale areas limited
to posterolateral angles (Fig. 44) . . . .
. . . . . . . . . . . . O. inaequale (Fabr.)
3’. Second segment of antenna with 1 or
more plates on sensory area (Figs. 41-42).
Prothoracic tergite not emarginate anteriorly
(Fig. 45). Dorsal color dark brown . . . . . 4
4. Second and third segments of antenna
subequal in length. Urogomphi distinctly
2-segmented (Fig. 36) . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . Necrophila americana (l.)
4’. Third segment of antenna distinctly
longer than second segment. Urogomphi
apparently with 1 segment (Figs. 38-39) . . 5
5. Second segment of antenna with 1 plate
on sensory area (Fig. 41). Last segment of
maxillary palpus about twice as long as
wide . . . . Aclypea bituberosa (leConte)
5’. Second segment of antenna with numerous
plates (Fig. 42). Last segment of
maxillary palpus about 3 times as long as
wide . . . . . Heterosilpha ramosa (Say)
Fi g s. 40-42. Second antennal segment of larval Silphinae:
40, Oiceoptoma novaboracense; 41, Aclypea bituberosa;
42, Necrophila americana or Heterosilpha ramosa
(Fig. 41 after Anderson and Peck 1985).
Fi g s. 43-45. Prothoracic and abdominal tergites of larvae
of 43, Oiceoptoma novaboracense; 44, O. inaequale;
45, Necrophila americana.
Genus AclypeA
The genus Aclypea has about 22 species
(Hatch 1928). They are Holarctic in
distribution. Only two species are found
in the United States.
Aclypea bituberosa (LeConte) (Fig.
46) is included in this work because there
are some old references indicating its
presence in Nebraska. This species does
not occur in Nebraska. I believe that the
earlier citations of its occurrence here were
a result of misidentification where Silpha
opaca (later thought to be bituberosa) was
confused with Oiceoptoma inaequale or
Heterosilpha ramosa.