196 Morphology of the Legs of Hymenopterous Insects. 
In the beautiful mud wasps of the family Pompilide, this appa- 
ratus is much as in the Sphegide, except that the cavity is more 
shallow. The fringe on the spur is peculiarly fine and beautiful. 
The spur is pointed, the point being flat and margined on both sides 
with spines. 
In the Mutillide this organ is specially well shown. The type 
is that of the bees and Vespide, as the blade is membranous and 
without the fringe. The back and both sides of the point, how- 
ever, are covered with a row of spinous hairs. 
In the ants—Formicide—(Fig 5) the cav- 
ity is shallow and the fringe well marked in 
the cavity and on the spur where it is double, 
and while this brush is beautiful, it is not 
widely different from the hairs on the point of the blade, and on 
the remaining Tii of the basal tarsus. 
In Ichneumonide (Fig. 
6), and Braconide we find 
this antenna cleaner, less 
developed, though still 
present. The cavity is 
E hardly more than an in- 
bjao e clined plane, the rise at 
the distal end being very slight. The spur is marked by a 
distinct concavity, and the fringe is present in the cavity and on 
the spur, though the brush in case is made up of coarser hairs 
than are found in bees or wasps. 
In the species of Chrysidæ we find this apparatus more perfect 
than in the Ichneumonidæ. The cavity is deeper, the spur con- 
cave, and both show the comb or fringe well marked. The species 
of this family are unique in that the concave spur is fringed to the 
very point of the blade. 
In the minute Proctotrupidæ the antenna cleaner is even less de- 
veloped than in the Ichneumon flies. The cavity is almost wholly 
obsolete, the spur is only slightly concave, and the hairs forming 
the brush are hardly different from the other hairs of the leg. In 
the Chalcid flies—Chalcididee—the cavity is wholly absent, and the 
only suggestion of this apparatus is in the slightly curved spur. 
The brush is also obsolete. The same is hardly less true of thegall- 
