Beetles Identification Guide

22
Key D DERMESTIDAE
1(0) Antenna without club (see Figs. 193 and 194). Abdomen with 7 visible
abdominal sterna. Male with soft and dehiscent elytra apically (Fig. 193);
female larviform, without hind wings and elytra (Fig. 194). [Length of
body 2.0—3.0 mm; habitus Figs. 200 and 201] ......................................
....................................................................Thylodrias contractus (p.114)
Antenna with club. Abdomen with 5 visible abdominal sterna. Elytra in
both sexes hard and not dehiscent (see Figs. 194—199) ......................2
2(1) Head without ocellus (Fig. 75). Length of body 5.5—12.0 mm ............
............................................................................................. (Dermestes) 3
Head with ocellus dorsally (Figs. 76—78). Length of body usually less
than 5.5 mm ............................................................................................8
3(2) Margin of elytron serrulate apically, apex spiniform (Fig. 97). [Length
of body 5.5—10 mm; habitus Fig. 197] .... Dermestes maculatus (p.109)
Margin of elytron more or less smooth apically, apex rounded (Fig. 98)
.................................................................................................................4
4(3) Metepisternum with small patch of black setae contrasting against
background of white setae. Abdominal sterna with black and white setae
producing distinct pattern (Figs. 79 and 80). First abdominal sternum
with lateral sulcus not extended to posterior margin of segment (Figs. 79
and 80) ....................................................................................................5
Metepisternum without contrasting patch of black setae. Abdominal
sterna with setae not producing clear pattern (Figs. 81—82). First
abdominal sternum with lateral sulcus extended to posterior margin of
segment (Figs. 81 and 82) ......................................................................6
5(4) Lateral part of pronotum almost entirely clothed with white setae. Elytra
without transverse band of white setae at basal third. Male with median
tuft of setae on fourth visible abdominal sternum only. Length of body
6—10 mm ........................................................ Dermestes frischii (p.107)
Lateral part of pronotum clothed with dark brown and golden setae.
Elytra with broad transverse band of white setae at basal third. Male
with median tuft of setae on third and fourth abdominal visible sterna
(Fig. 261). Length of body 10—12 mm Dermestes marmoratus (p.109)
6(4) Elytra covered with pale setae scattered among darker setae; scutellum
with pale setae. Lateral sulcus of first visible abdominal sternum curved
medially on anterior half (Fig. 81). [Length of body 7—9 mm] ............
............................................................................... Dermestes ater (p.106)