26 PRELIMINARY LIST 



Colorado as well on plains and if'oot-hills as in mountains. Near Denver and 

 also in Clear Creek Canon, August 6th (Uhler, 5). Summit of Arapahoe Peak, 

 13,000 feet, July 14th (Packard- -see Uhler, 5), Custer county, midalpine 

 (Cockerell, 10). Colo. (Gillette— see Osborn, 1). 



Fort Collins, February 19th to April 16th; Spring Canon, 

 March 12th (Gillette). 



Peritrechus fraterinis Uhl. 



Ula, Custer county, November 12th (Cockerell, 10), 



Rhyparochronms Aoralis Uhler n. sp. 



"Long-elliptical, rusty fulvous, opaque, minutely sericeous pubescent. Head piceous 

 paler or rufo-fulvous at tip, subconic, nodding, smooth, shorter than the pronotum, 

 minutely scabrous, strongly convex above, with the throat pale rufo-fulvous; antennae 

 stout, about as long as the pronotum and corium united, dull fulvous, pale pubescent, 

 with the fourth joint and apex of the third blackish piceous, the basal joint extending a 

 ■ little beyond the tip of the head, second much longer, the third about one-half longer but 

 a little shorter than tlje second, the fourth about equal to the second; rostrum reaching 

 upon the middle coxae, slender, pale fulvous, with the apical joint black. Pronotum sub- 

 quadrangular, a very little wider at base than at tip, fulvous or rufo-fulvous, dull testa- 

 ceous and punctate with black on the basal one-third, the lateral margins a little reflexed, 

 black, slightly convexed next the apical angle, the submargin ivory white, expanding 

 posteriorly where it abuts against a tumid black humeral spot, the inner boundary of 

 this stripe and the anterior submargin finely punctate with black, disk not distinctly 

 punctate, behind this is a feebly raised whitish line. Scutellum very long and acute 

 fulvous, transversely indented on the middle, finely punctate before the middle and 

 corsely punctate with black towards the tip, the middle line more or less black. Corium 

 whitish testaceous, with about nine slender blaf^k oblique lines (including the clavus) 

 which are mostly composed of impressed punctures, the costal border and a transverse 

 spot upon a wide black area, which also covers the cuneus, dull white, exterior reflexed 

 edge of costal border dark brown; membrane smoke brown, with a short white spot next 

 the tip of cuneus, and a double fainter one at tip. Legs pale fulvous, pale on middle of 

 tibiae and base of tarsi. apicf'S of tibiae and tarsi piceous. Pectus dark rust brown, paler 

 anteriorly, the segments on the posterior border and a spot above eacli of the coxae 

 pale yellow. Venter dull black, bordered above with testaceous or fulvous. 



Length to tip of venter, 6-t5..5 mm. Width of pronotum, L75-2 mm. This seems to be a 

 common species in Colorado, Montana, California, etc." 



Abundant at Fort Collins, throughout the season, under 

 stones, etc., usually in company with Formica neoclara Em. 

 (Baker). 



Rhyparochroiuiis (Dorachosa) illuiuinatiis Dist, 



Dixon's Canon, February 28th, under a stone (Baker). 



J^reniocoris ferns Say. 



Custer county, midalpine (Cockerell, IC). Colo. (Gillette— see Osborn, 1). 



Dolores, June 16th (Gillette) . 



J^reiuocoris tropicus Dist. 



Fort Collins, March 26th; foot-hills live miles west of Fort 

 Collins, March 15th and 16th (Gillette). 



