ii6 The Ohio Naturalist. [Vol. VII, No. 6, 



for often it is impossible to say whether the oviduct is conical 

 or flattened. 



The species of Philonicus, 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- 

 tinctly cut out to apex with a distinct open space between them. 



Pliiloiiicus albice IS Meij;'. a. tip of female alMlomeii to sliow it.s form and tlieaiiical 

 .sijincs: b, view of last segment from the end: c, ti|i of male abdomen as seen from ilie 

 side : d, same from dorsal view. 



It appears that Vvdiat Dr. Williston has called Stcnoprosopis 

 arizonensis should be included in this genus; at least specimens 

 that agree in detail with his description are at hand and the 

 characters of Philonicus are very plain in both sexes, but it is <i 

 question whether the oviduct is conical in the females. 



The following kev 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 lUack. .3. 



2. Wings distinctly reddish. rufipcnnis. 

 Wings hyaline. arizo}icusis. 



3. Legs black except the extreme bases of the til)iic. tiixpanganns. 

 Legs with the tiV)i;e and tarsi largely reddish. obscuriis. 



Philonicus arizonensis Williston. Gibbosity of the face vcrv 

 small, Willi a few white bristles; front and face white; bristles 

 and hairs of the head all white; Hrst 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 ])ollinose with a niiddorsal gray strijjc, nar- 

 rowly divided before, and two spots on each side, one bel'ore and 

 the other behind the transverse suttirc. These brown markings 



