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Comprehensive Description

provided by Memoirs of the American Entomological Society
Pegomyia triseta Malloch
Pegomyia calyptrala Stein not Zetterstedt, Berl. Ent. Zeitschr., (1897), xlii, p. 237,
1898. Pegomyia triseta Malloch, Trans. Amer. Ent. Soc, xlvi, p. 177, 1920. Malloch,
Bull. Brooklyn Ent. Soc, xv, p. 123, 1920. Johnson, Occ. Pap. Boston Soc. Nat.
Hist., vii, p. 233, 1925. Pogonomyia triseta Seguy, Gen. Insect., fasc. 205, p. 320, 1937.
The species triseta resembles bicolor, from which it differs by having third antennal segment and scutellum partly yellowish. In both species the apical posterodorsal bristle on hind tibia is strongly developed and in male the processes are typically short and weakly bristled, being rounded and bare on apical region.
Stein (1898) described the species as calyptrata (Zetterstedt), as indicated by the specimens in the Illinois Natural History Survey and Field Museum collections. According to Ringdahl (1938) calyptrata is identical with Stein's species Pegomyia iniqua (1906), a proposal which if accepted would provide a tangible means of evaluating the relationship between triseta and calyptrata. I have regarded the two species as probably distinct, since calyptrata and iniqua evidently possess more the characteristics of winthemi than of bicolor.
Alberta: i cf, Lethbridge, May 6 1923, [C. N. C.].
British Columbia: i 9, Oliver, May 8 1923, (C. B. C. Garrett); 1 9, Royal Oak, July 31 1917, (W. Downes), [C. N. C.].
Illinois: i cf, White Heath, June 24 1916; 1 9, Urbana, August 4 1916, [111. Manitoba: i cf, Aweme, October 4 1923, (N. Criddle), [C. N. C.].
New York: i cf , Ithaca, June 1 1916, [H. C. H.]. Ohio: i 9 , Columbus, June 1 1904, (J. S. Hine), [Ohio State Univ.].
Ontario: i 9, Sudbury, July 13 1889; 1 9, Trenton, August 13 1901, (Evans); 1 o Cornwall, June 27 1925, (F. Ide), [C. N. C.].
Pennsylvania: i d Tinicum Island, April 25 1900, (C. T. Greene), [U. S. N. M.].
South Dakota: i d Custer, July 15 1924; 1 9, Big Stone, August 18 1924, [South Dakota State Col.].
Wisconsin: i d Dane County, July 6 1936, (F. M. Snyder), [Univ. Wise.].
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bibliographic citation
Huckett, H.C. 1941. A Revision of the North American Species Belonging to the Genus Pegomyia (Diptera: Muscidae). Memoirs of the American Entomological Society vol. 10. Philadelphia, USA

Comprehensive Description

provided by Memoirs of the American Entomological Society
Pegomyia pollinosa Ringdahl
Pegomyia (Pegomyia) pollinosa Ringdahl, Ent. Tidskr., lix, hft. 3-4, p. 209, 1938. Pegomyia pollinosa Huckett, Trans. Amer. Ent. Soc, lxv, p. 12, 1939.
The following specimens of pollinosa were submitted, among others belonging to Pegomyia, to Mr. Ringdahl for comparative study. Ringdahl recognized the specimens as being identical with some that he had recently captured near Halsingborg, Sweden, and to which he later gave the name pollinosa. The North American specimens of pollinosa that I have seen differ slightly from the male description of european forms in having the antennae, humeral callosities, thoracic pleura and scutellum yellowish tinged, and abdominal terga lacking the dark transverse incisures. The species pollinosa structurally resembles flavipalpis, from which it differs in the male by having the abdomen largely reddish yellow and marked with a deeper reddish linear dorsocentral stripe, all femora and tibiae entirely yellowish. The female of pollinosa differs from that of flavipalpis by having three anterodorsal bristles on hind tibia, by the lack of a comparatively stronger developed preapical bristle in the median posterior series of fore femur, and by the yellowish tinge possessed by the wings.
Alaska: i d Anchorage, July 19 1921, (J. M. Aldrich), [U. S. N. M.]. Alberta: i d Wabamun, July 1 1931, (E. H. Strickland), [C. N. C.]. New York: i tf, Babylon, Long Island, June 15 1936, (Blanton & Borders); 1 9, Cranberry Lake, July 21 1920, [H. C. H.]. Nova Scotia: i , Truro, July 12 1913, (R. Matheson), [H. C. H.]. Ontario: i d 1 , Ottawa, June 18 1916, (W. T. M. Forbes), [A.'N. S. P.]. Quebec: i 9, Abbotsford, June 15 1936, (G. E. Shewell), [C. N. C.]. South Dakota: i 9, Custer, July 19 1924, [South Dakota State Col.].
license
cc-by-nc-sa-3.0
bibliographic citation
Huckett, H.C. 1941. A Revision of the North American Species Belonging to the Genus Pegomyia (Diptera: Muscidae). Memoirs of the American Entomological Society vol. 10. Philadelphia, USA