. Annual report. 1st-12th, 1867-1878. Geology. 564 GEOLOGICAL SURVEY OF THE TERRITORIES. Sericomyia militarise Walk. (Colorado Mountains); the same insect occurs frequently in Canada and also in the White Mountains. Helophilus bilineatus, Curtis (Twin Lakes), first described from speci- mens brought back by Captain Eoss from his polar cruise. I possess it also from Labrador. Helophilus, n. (South Park, Colorado), which I also received from Fort Resolution, on Mackenzie Eiver, and from other parts of the British possessions. Chrysotoxum derivation, Walk., (Colorado Mountains), described by
. Annual report. 1st-12th, 1867-1878. Geology. 564 GEOLOGICAL SURVEY OF THE TERRITORIES. Sericomyia militarise Walk. (Colorado Mountains); the same insect occurs frequently in Canada and also in the White Mountains. Helophilus bilineatus, Curtis (Twin Lakes), first described from speci- mens brought back by Captain Eoss from his polar cruise. I possess it also from Labrador. Helophilus, n. (South Park, Colorado), which I also received from Fort Resolution, on Mackenzie Eiver, and from other parts of the British possessions. Chrysotoxum derivation, Walk., (Colorado Mountains), described by Mr. Walker, from the British possessions in North America. I have specimens from Alaska. Eristalis, two or three species (specimens principally from Twin Lake Creek), which I could not identify with any species I know. Melithreptus, sp. (Twin Lake Creek), very like M. cylindricus, Say, but apparently different. Syrphus eorollce (Fair Play), vitripennis (?) and one or two others which I could not identify. Syrphus obliquus, Say, was found above the tree-line. Family (Estrid^e. The common horse bot, Gastrus equi (Colorado Mountains). The families Tachinidw, Anthomyidw, Muscidce are represented by a considerable number of specimens, although not so many species. I will notice especially the frequent occurrence of species of Gonia in the mountain-region, and a large Echinomyia from the plains. The common blue bottle fly has been found ascending the mountains above the tree line. As the above-named families have not been worked up in the Eastern States yet, it would be premature to attempt any further identification of the species. The most interesting novelty in the whole collection is a species of the family Blepharoceridce, a family rather anomalous in its structure, of very doubtful position in the system, and counting, as yet, but a few members. Only seven species, distributed among five genera, are known from the whole world.* Four of these species are from Europe; the remain
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