Ctenothrips bridwelli Franklin

Ctenothrips bridwelli Franklin, 1907: 248.

Ctenothrips frosti Moulton, 1929, Syn.n.

(Figs 13, 27, 50, 53)

Originally described from Dover, New Hampshire, this species has been recorded from many other States in USA, including NY, VT, MA, IL, MD, CT, TN, also Alberta and Québec, Canada (Blanton 1939; Crawford 1939; Diffie et al. 2008; Light & Macconaill 2011). An extensive collection, including full and short-winged individuals within populations, was studied (Appendix 1), and the following variations observed: ocellar setae pair III shorter than or as long as postocular setae (Fig. 13), or even much longer and almost as long as the pronotal posteroangular setae; ocellar setae pair III arising anterior to hind ocelli, between hind ocelli, or just near posterior margin of hind ocelli; tergite VIII median setae in front of campaniform sensilla, or posteromedian to campaniform sensilla; antennal segments III–V completely yellow varying to segments IV–V shaded on distal half.

The holotype of frosti was studied, which is a short-winged female in bad condition (Fig. 54). We concluded that it does not differ significantly from other short-winged specimens of bridwelli. The completely dark tibiae of bridwelli is the only reliable distinction between this species and the European distinctus. A few specimens from Tennessee have been studied with yellowish brown tibiae, but these specimens may not have been fully mature.

Material examined: CANADA, Alberta, Edmonton, 12 females, 4 males from Lilium leaves, 11.ix.1979 (B.S. Heming); Québec, Gatineau Pk., 4 females, 4 males from Epipactis helleborine, 28.viii.2009; 1 female from Trillium grandiflorum, 24.vi.2008 (M. Light). USA, Connecticut, Bridgeport, 3 micropterous females from leaves, 24.vii.1913 (H.M. Russell); Illinois, Muncie, 4 females from green-dragon leaves, 25.vii.1908 (C.A. Hart); Urbana, 1 female from Trillium recurvatum, 11.v.1907 (C.A. Hart); Vermont, Northfield, 2 females from Caulophyllum thalictroides, 31.vi.1992 (M. Skinner); Massachusetts, Sherborn, holotype female of frosti, 24.iii.1928 (C.A. Frost); 1 female from Skunk cabbage, 23.iv.1955 (Chapin); New York, 2 females, 1 male from Lilium, 2.viii.1939 (E.P. Imle); 1 female from Polygonatum, 6.viii.1930 (J.D. Hood); 2 females from Podophyllum, 30.v.1924 (J.D. Hood); 1 male, 14.x.1930 (E.A. Maynard); 1 female, 27.v.1938 (J.C. Bradley); Washington, 5 females from Trillium, 6.iv.1913 (J.D. Hood); Tennessee, 5 females from Trillium (Ainslie), 1 female, xi.2001.