. The Canadian entomologist. Insects; Entomology. €anat( mutomotmii$t. Vol. XLIII. LONDON, xMARCH, 1911 No. 5 GEOMETRID NOTKS ON THE GENUS HYDRIOMENA, HUB. BY L. W. SWETT, BOSTON, MASS. As 1 was uiuible to identify material in this group, and realizing ihat the species were badly mixed, I decided to try to straighten them out. First, I was puzzled by the marki igs, I could find little constancy and every style of variation ; secondly, in similarly marked species evtry variety of colour occurred, which made the specimens so different looking that I did not dire call them the same. Starting
. The Canadian entomologist. Insects; Entomology. €anat( mutomotmii$t. Vol. XLIII. LONDON, xMARCH, 1911 No. 5 GEOMETRID NOTKS ON THE GENUS HYDRIOMENA, HUB. BY L. W. SWETT, BOSTON, MASS. As 1 was uiuible to identify material in this group, and realizing ihat the species were badly mixed, I decided to try to straighten them out. First, I was puzzled by the marki igs, I could find little constancy and every style of variation ; secondly, in similarly marked species evtry variety of colour occurred, which made the specimens so different looking that I did not dire call them the same. Starting wich the first species of Hydriomena in Dyar's List, namely, Hydriomena S07-didata Fab., I was struck with the variability of colouring and markings, and realized that I mu>t depend on something more constant than markings to separate such an unwieldy mass of specimens. The genitalia, an important character, I unible to study much, as most of the material at my disposal was loaned, so tliat I could not proceed very far, but I noiiced that the palpi cf certain species seemed to be of approximately the same relative length, i)vving for variation in size of specimens. This srt me on the light 'i, as I found that by grouping certain species with palpi of the same length f could follow the variations in colour, and that there seemed to be a regular colour scheme in variable species, so that by knowing the colour of the type ?]3ecimen I could predict the variations to a ceita n extent tliat ought to (jccur under the species. The colour scheme suggested itself to me from a French author's work on another group, and I found I cou'd apply it here. Hydriom(7ia sordidata Fab., or more \)XQ)\)^x\y furcat i Thunberg, Diss. Lis. Suec , pt. i, Dec. \\, 1784, has priority over sordidata Fab., Ent. Syst., HI, pt. 2, p. 1S5, 1794, which my kind frien<', Mr. Louis Prout, first points out in the Entomologists' Record (London). Vol. 9, p. 84-87, April, 1S97. Hydriomena sordida
Size: 1648px × 1517px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubje, booksubjectentomology
