250 NATURAL HISTORY BULLETIN. 



P. hepaticuS Er. Colorado Springs, Bowditch; Rico (in doubt), Hayward. 



P. palliaTus Grav. Colorado, Horn. 



P. quisouiliarius Gyll. Durango; La Junta. Both of these records are 

 from Mr. Hayward who expresses some doubt as to the determinations 

 of his Philonthi. Allowance must be made for this doubt in the case of 

 the other species of this genus credited to him. 



P. Theveneti Horn. Williams River Valley. 



P. debilis Grav. Garland; Veta Pass, 9,400 feet. 



P. varians Payk. Buena Vista; Pike's Peak, 10,000 to 11,000 feet; Moose 

 Mountain, above timber; Georgetown; Fort Collins. 



P. longicornis Steph. Summit County, Cockerell. 



P. discoid EUS Grav. Gunnison; Montrose. Both records are from Mr. 

 Hayward. 



P. FUSIFORMIS Melsh. Colorado, Horn; Buena Vista. 



P. occidentals Horn. Saguache Creek, above Rock Cliff, Saguache 

 County, Cockerell; Colorado Springs; Durango and mountains south- 

 west of Montrose, Hayward. 



P. FERREiPENNis Horn. West Cliff, name in doubt. 



P. brunneus Grav. Dixon Canon, March. 



P. sordidus Grav. Colorado, Horn. 



P. CEPHALOTES Grav. Colorado Springs, Wickham. 



P. INVERSUS Horn. Garland, Horn. 



P. viriliS Horn. Canon City. A species closely allied or identical was 

 taken by me at Ouray, Georgetown, and in the Leavenworth Valley, up 

 to about 11,000 feet. 



P. nigritulus Grav. Garland; Veta Pass, 9,200 feet. 



P. microphthalmia Horn. Canon City; Ouray, with Formica obscuripes. A 

 species, probably the same, was taken at Georgetown, Leadville, Buena 

 Vista and in the Leavenworth Valley. 



P. instabills Horn. Colorado Springs; Buena Vista; Leadville. 



P. LECONTEt Horn. Colorado, Horn; Cochetopa Pass, Hayward. 



P. aurulentus Horn. Salida; Buena Vista, on marsh land; Fort Collins. 



Actobius senilis Horn. Colorado, Horn. 



A. pusio Horn. Garland, Horn. 



A. p.EDEROIDES Lee. Colorado Springs; Spring Canon. 



Bisnius procerulus Grav. Colorado, Horn. 



Xaxtholinus cephalus Say. Veta Pass, 9,400 feet. 



X. obsidianus Melsh. Fort Collins. 



X. EMMESUS Grav. West Cliff. 



X. OBSCURUS Er. Vicinity of Fort Collins, April and May; Colorado 

 Springs; Buena Vista; Alamosa; West Cliff. 



X. hamaTus Say. Fort Collins; Trinidad. 



Dianous niTidulus Lee. Garland. 



Stenus punctiger Case}-. Garland, Casey. 



S. colon Say. West Cliff (in doubt), Cockerell. 



S. renifer Lee. Colorado Springs, June; Pleasant Valley, March, Gil- 

 lette. 



S. perplexus Casey. Williams River Valley, Bowditch. 



