The Ohio Naturalist. 
[Vol. VII, No. 6, 
116 
for often it is impossible to say whether the oviduct is conical 
or flattened. 
The species of Philonieus, so far as known, are all medium 
sized species; the facial gibbosity is small with comparatively 
few bristles; oviduct conical, end lamella with four apical bristles 
on the upper side. Male genitalia, as seen from the side, of 
ordinary size, the side pieces each have a distinct prominence at 
the middle above, then they are narrowed and curve inward 
until they almost touch at the tips. From above these same 
pieces are wide for slightly more than half their length, then dis- 
tinctlv cut out to apex with a distinct open space between them. 
Philonieus albice;>s Meisr. a. tip of female abdomen to show its form and the apical 
spines; b, view of last segment from the end; c, tip of male abdomen as seen from the 
side ; d, same from dorsal view. 
It appears that what Dr. Williston has called Stenoprosopis 
arizonensis should be included in this genus; at least specimens 
that agi'ee in detail with his description are at hand and the 
characters of Philonieus are very plain in both sexes, but it is a 
question whether the oviduct is conical in the females. 
The following key may be used as an aid in separating the 
known Nearctic species: 
1. Legs in most part yellowish. 2. 
At least the femora of all the legs black. 3. 
2. Wings distinctly reddish. 
Wings hyaline. 
3. Legs black except the extreme bases of the tibiae. 
Legs with the tibiae and tarsi largely reddish. 
ntfipennis. 
arizonensis. 
tuxpanganus. 
obscurus. 
Philonieus arizonensis Williston. Gibbosity of the face very 
small, with a few white bristles; front and face white; bristles 
and hairs of the head all white; first segment of the antenna 
black, second more or less yellowish and shorter than the first, 
third black, exclusive of the arista about as long as the other two 
together, arista slender and slightly shorter than the third seg¬ 
ment. Thorax gray pollinose with a middorsal gray stripe, nar¬ 
rowly divided before, and two spots on each side, one before and 
the other behind the transverse suture. These brown markings 
