486 PROCEEDINGS OF THE ACADEMY OF [DeC. 



0. franciscanus StSl, Frega Eugenes Resa. Ins., p. 273, 1859. Cali- 

 fornia. Seems to be near aridiis Ball. 



0. sementinus Ball, Can. Ent., xxxiv, p. 152, 1902. Colorado. A 

 small robust species. 



0. 'pimn Kirk., Haw. Sugar Plant. Assoc, Bui. iv, p. 62, 1907. Arizona. 



1. Oliarus vicarius Walker. 



This species is very close to 5-1 i neat us Say. I separate it by its 

 slightly larger size, less strongly maculatetl elytra, longer and nar- 

 rower stigma and pellucid wings. The general color is paler, the 

 rostrum is considerabh^ longer, nearly or quite attaining th§ hind edge 

 of the sixth abdominal segment; and the intermediate carinse of the 

 mesonotum become evanescent or join the median carina some dis- 

 tance from the hind margin of the pronotum. I took an example of 

 this species at Atlanta, Georgia, in May, 1899, and have seen one pair 

 taken by Mrs. Slosson at Jacksonville and Omond, Florida. 



2. Oliarus quinquelineatus Say. 



This is our most ab\mdant and widely distri))uted species. I took a 

 fine series at Boulder, Colorado, in July, 1903, and have also taken it 

 about Buffalo, New York, and at Cape May, New Jersey, and Atlanta, 

 Georgia. Prof. Osborn has sent me specimens from Ohio, and I have 

 examined material from other localities as far south as Florida. 

 0. 5-lineatns is proportionateh' broader and shorter than vicarius, with 

 heavier elytral maculations, a blacker and nearly quadrate stigma and a 

 distinctly broader front. The general color is darker, almost a piceous 

 brown on the head and thorax, and the wings are quite deeply infuscated 

 toward their apex. The male genitalia are quite distinct from that of 

 vicarius; the ventral sinus on the genital segment is deeper with the 

 median tooth pale yellowish and slender, reaching to the line of the 

 rounded lateral lobes ; the plates are narrow and abruptly bent and but 

 little widened at apex, and the pygofers are expanded and rounded at 

 apex and considerably longer than the plates, forming a concave dome 

 beyond their tips. In vicarius the median tooth does not attain the 

 line of the lateral lobes of the genital segment; the expanded apex of 

 the plates are broader and more rounded and strongly reflexed, and the 

 pygofers are narrower, flatter at apex, and but little surpass the tip 

 of the plates. 



3. Oliarus aridus Ball. 



A western form of which I have before me only Colorado specimens. 

 It is of about the size of the preceding species and may be distinguished 

 by its broader vertex, the somewhat indefinite pale spots on the apex 

 of the front and the whitish-hyaline elytra with minutely dotted ner- 



