108 WATT 
Sometimes with indistinct secondary costae between primary costae. There is no 
trace of striae. Punctation of upper surface irregular, of same type as pronotum, 
but punctures smaller or larger than those of pronotum, depending on the species. 
Macropunctures usually bearing short, fine hairs visible at 100 X magnification, 
sometimes at 25 x magnification. Microscopic granules often present on hind 
slopes and lateral slopes, sometimes on disc. Microsculpture weak to strong. 
Epipleura relatively broad, deflexed at roughly 45°C, punctation always unlike that 
of upper surface, punctures usually much smaller, granules sometimes present. 
Mesonotum. Scutum well sclerotised, crescent-shaped, very transverse about five 
times wider than long. Median longitudinal impression and posterior suture 
(between scutum and scutellum) distinctly impressed. Dorsal surface closely 
punctured, each puncture bearing a fine, short seta. Transverse struts present 
ventrally. Prescutum (if present) completely membranous and indistinguishable. 
Scutellum broadly shield-shaped, distinctly raised posteriorly above level of scutum 
— this raised portion is approximately triangular, and is the visible part described 
in specific descriptions. Axillary cord extending slightly further laterally than 
scutum. 
Metanotum. Wings functionless, vestigial, not exceeding about 4 mm in length. 
The bases of 2 veins only (presumably R and Cu) are distinguishable. A study of 
the wing venation of the fully winged Pterohelaeus might be of assistance in 
interpreting the vestigial venation of Mimopeus. 
Metanotum shows considerable reduction compared with that of fully winged 
tenebrionids, as is general in flightless forms. Very short and transverse, over five 
times wider than long. Scutellum broadens considerably anteriorly. All sclerotised 
bars, struts etc. reduced or absent except for those between scutum and scutellum, 
which are greatly extended laterally. 
Abdominal tergites and pleurites. All pleurites membranous. All tergites membra- 
nous except tergite 7, tergite 8, and in the male, tergite 9 (=proctiger of ovipositor 
in female). Tergite 7 is roughly the same shape in both male and female. The apex 
of tergite 8 is rounded in the female, but subtruncate in the male. Tergites 7 and 8 
are covered densely with fine setae in both male and female. 
Mouthparts (Figs.9-14). Labrum approximately as in Fig.13, truncate or emargin- 
ate anteriorly, dorsal surface bearing setiferous punctures near anterior margin, 
anterior setae moderately stout, others short and fine, all projecting forwards. 
Surface covered with very fine, irregular microsculpture. Epipharyngeal surface 
(Fig.14) densely setose anteriorly, these setae stout and directed towards mid-line, 
except those on anterior margin which extend straight forward. Setae absent from 
latero-posterior and posterior surfaces. Median area bears large punctures, on each 
side of which is an area of minute denticles directed towards it. Tormae as in 
Figs.13 and 14, and joined by transverse bar, not extensively fused with 
epipharynx. 
Mandibles (Figs.9, 10) stout, asymmetrical. Scissorial and molar parts heavily 
sclerotised, black even in cleared KOH preparations. Outer dorso-lateral and 
ventrolateral edges sharply carinate. Scrobe between carinae bearing a few very 
fine and short setae. Apices of both mandibles bifid. Scissorial edge of right 
