192 
Psyche 
[September 
mera are not visible behind the hind margins of the mesosternum. 
The sides of the mesosternum are flattened and meet the adjacent 
flattened portion of the mesepisterna at a slight angle, only a fine 
groove separating them. There is no fringe of setae along this groove. 
Another feature that appears to be unique in the family is the 
presence of a zone of tiny spines on the bases of the tibial spurs, 
encircling the spurs. These are present in all of the species of Ischyro- 
palpus examined in slide preparations. All other Anthicidae examined 
have the spurs without spines or have the spines arranged in two 
longitudinal rows on the surface nearest the tarsus. 
Some other external features are apparently quite stable, although 
not limited to the genus. The tactile setae are short and inconspicuous 
and the elytral punctures are not arranged in rows. The genus 
Anthicus , s. str., is similar in both these features, although some 
species have both tactile and normal setae long. 
The cf aedeagus is distinctive. The tegmen has the parameres 
separate and sometimes very complex; these are asymmetrical in some 
species. The apodeme (basal piece) is unusually broad, especially near 
the attachment of the parameres. The penis is relatively simple, but 
has an unusually long apodeme, which may extend beyond the end 
of the apodeme of the tegmen in repose. The penis probably slides 
freely in the tegmen, because it is sometimes found far extended in 
dissected specimens. The internal sac is extremely complex and com- 
pletely unlike this structure in any other genus examined. The entire 
apical area has transverse ridges or thickenings and there is a pair of 
plates about half-way along the sac. These have not been seen in any 
other genus. The plates are absent in the known males of the Eryngii- 
Group described below, but present in all other members of the 
genus examined. 
The Eryngii-Group also is different in the external feature most 
easily seen in the rest of the members of the genus. This is the shape 
of the last segment of the maxillary palpi, which is in the form of a 
roughly isosceles triangle with the apex at the point of attachment. 
Many species have this segment extremely broad. But a few, notably 
I. sericeus Bonadona, have the sides of the triangle unequal and the 
apex rather narrow. The members of the Eryngii-Group have the 
segment narrowly securiform. 
The typical species, not including the Eryngii-Group, have a rather 
distinctive facies. The prothorax is quite deeply constricted laterally 
in the basal third, with the sides rounded from there to the collar. 
The disc is not grooved at the level of the constriction. The large 
species that made up most of the genus Ischyropalpus as previously 
