50 
Psyche 
[March 
Figs. 7-8. Male terminalia of Scolebythus madecassus, ventral aspect. 7. Sub¬ 
genital plate. 8. Genitalia. 
that species, except that the parameres are more elongate. The 
genitalia of Ycaploca evansi as figured by Nagy (1975) appear to 
lack one element in the volsella, but they are otherwise basically 
similar. The genitalia of three genera of Scolebythidae thus appear 
to be very similar and of the basic bethylid type. The lack of socii is 
also a bethylid feature; these structures appear to be present in most 
Scolioidea and most other Aculeata. 
One further point needs to be made. In the original description of 
Scolebythus it was stated that the scutellum has a “pair of widely 
separated, transverse pits”'. In fact, all specimens in the present 
series have a transverse groove at the base of the scutellum. The 
“transverse pits” represent a misinterpretation of the structure of the 
type specimen of madecassus, where the groove appears to be closed 
except laterally. This feature cannot be used to separate Scolebythus 
and Ycaploca, as Nagy (1975) has done, but one must rely on the 
