. An annotated list of the Diptera (flies) of Oregon. Diptera. 252 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Sm. 299. Rhabdopselaphus sigma (Coq.) Dee, VI-17 (Cole). 300. Toxophora maxima Coq. Hood River, VI-13 to IX-4 (Cole). Family ASILID^. Fig. 22. Cyrtopogon thompsoni Cole, n. sp. Drawing of holotype. The robber-flies vary in size from one-third of an inch to two inches in length. A few are bright colored, but the majority of the species are sober gray with black markings. The head is short, the eyes widely separated in both sexes and bulging out; the body is more or less bristly in all th
. An annotated list of the Diptera (flies) of Oregon. Diptera. 252 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Sm. 299. Rhabdopselaphus sigma (Coq.) Dee, VI-17 (Cole). 300. Toxophora maxima Coq. Hood River, VI-13 to IX-4 (Cole). Family ASILID^. Fig. 22. Cyrtopogon thompsoni Cole, n. sp. Drawing of holotype. The robber-flies vary in size from one-third of an inch to two inches in length. A few are bright colored, but the majority of the species are sober gray with black markings. The head is short, the eyes widely separated in both sexes and bulging out; the body is more or less bristly in all the species. These flies are very savage and catch much of their prey in mid-air, even killing other asilids. Wasps, moths and even large grasshoppers are pounced upon, the choice of the victims depending upon the size of the brigand. Certain genera seem to prey on certain orders of insects. The larvae are generally beneficial, as probably all prey upon other insect larvae, either in the ground or in rotten Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Cole, Frank R. (Frank Raymond); Lovett, Arthur Lester, 1885-. [San Francisco]
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Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectdiptera, bookyear1921
