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178 THE CONDOR VOL. X 6500. Not common enough at any time to ascertain migration dates. Mr. Sulli- van, speaking of one observed July 3, 1904, classes it as probably accidental." $alpinctea 0ba01etua. Rock Wren. Summer resident, common. Wherever suitable breeding grounds are available the Rock Wren. is sure to be found. It is equally abundant about sand-stone ledges in the dry winter range country and along the stone fences in cultivated sections. Arrives about May 1, breeds three weeks or a month later and leaves the County early in October. Mr. Warren re- ports them as common near Grand Junction the first week in October. Catherpes mexicanus c0nspersus. Canyon Wren. The only absolute record at hand is one bird taken at Grand Junction by H. G. Smith March 3, 1906, which is now in the collection at the State Capitol; but there is every reason to believe that this species is more common in Mesa County than in any other county in the State. Mr. Sullivan saw a pair of Wrens May 4, 1904, which he attributed to this species. Prof. Cooke reports them as common around DeBeque early in October, 1906, and several seen at Grand Junction in November, 1895. Thry0manes bewicki leuc0aster. Baird Wren. Prof. Cooke says, "Several seen and one collected November 2, 1895, by A. H. Howell at Grand Junction.'.' This is the only Mesa County record at hand. Tr010dytes aed0n parkmani. Western House Wren. Summer resident, abun- dant. A common bird thruout the County, but much more abundant about 6500 feet than below and thruout the quaking-asp regions is one of the most abundant breeders. Arrives early in May, breeds about the middle of June and as soon as the young are able to fly ascends to 9 or 10,000 feet in search of insect food. Dur- ing the month of August they are more abundant than any other bird on the Grand Mesa. Depart for their winter home late in September. Their choice of a nesting site varies greatly. Nearly every deserted cabin has its pair of Wrens, nesting in the crevices between the logs. Gate-frames, boxes, old woodpecker holes, natural cavities and deserted mud nests of the Cliff Swallow are favorite sites. [Telmatodytespalustris plesius. Interior Marsh Wren. "Occurs in Routt County where it winters in the hot water swamps" (Cooke). Probably occurs in Mesa County as a rather rare summer resident.] Certhia familiaris montana. Rocky Mountain Creeper. Regarding this bird Miss Eggleston says, "Occasional visitor. This bird's visits are uncertain as to time or occasion around Grand Junction. Sometimes in midwinter its cry is heard and a little investigation will locate him creeping up the vines on some of the large buildings or working around the cracks in the bark of the fruit trees. It is not shy and can be watched closely after being located." Sitha carolinensis nelsoni. Rocky Mountain Nuthatch. Resident, not uncom- mon. Much more in evidence in winter than in summer, when it is rather com- mon in the cedars and pinyons from 6000 to 8000 feet. During the summer when they retire to heavy timber in the higher altitudes, they are very unobtrusive and are rarely seen, but it is reasonable to suppose that they are fairly common breeders. There is one bird at the State Capitol collected by Mr. H. G. Smith at Grand Junction, November 17, 1903. Mr. Sullivan only saw it twice in Grand Junction in three years' observations, one of which was the above mentioned bird. [Sitta canadensis. Red-breasted Nuthatch. Cooke gives this bird as resident in the mountains tho not so common as nelsoni or pyg?rnc?a. It is probably of regular tho uncommon occurrence in eastern Mesa County.] [Sitta pygm?ea. Pigmy Nuthatch. An abundant bird thruout the mountain region of the State. It undoubtedly is a rather common resident in Mesa County and has simply been con- fused with S.c. nelsoni by field workers.] Baeolophus inornatus griseus. Gray Titmouse. Prof. Cooke says that several