. The Canadian entomologist. Insects; Entomology. Fig. 30.—Macrosiphum ribiellum. —A. cornicle of apterous viviparous female; B, antennal hair; C, antennal segments III and IV of winged viviparous female; D, antennal segments III and IV of apterous viviparous female. lactucce filament of VI is only very slightly (1/7 to 1/6) longer. Rhopalosiphum brittenii Theob. has large swollen cornicles like lactucce which at once separates this species. Myzus ribis L. bears numerous sensoria on IV and V, and has very slender cylindrical cornicles which easily separate it from Macro, ribiellum. Myzus
. The Canadian entomologist. Insects; Entomology. Fig. 30.—Macrosiphum ribiellum. —A. cornicle of apterous viviparous female; B, antennal hair; C, antennal segments III and IV of winged viviparous female; D, antennal segments III and IV of apterous viviparous female. lactucce filament of VI is only very slightly (1/7 to 1/6) longer. Rhopalosiphum brittenii Theob. has large swollen cornicles like lactucce which at once separates this species. Myzus ribis L. bears numerous sensoria on IV and V, and has very slender cylindrical cornicles which easily separate it from Macro, ribiellum. Myzus whitei Theob. is separated by the occurrence of a number of sensoria on IV and V, but resembles ribiellum in the character of the cornicles. Myzus dispar Patch also resembles ribiellum in the character of the cornicles, but dispar differs by having antennal segment VI filament twice the length of seg- ment III. We have not seen Rhop. ribesina v. d. G., but the cornicles are said to be distinctly club-shaped and the antennae to bear sensoria (10-15) on antennal segment IV. Myzus cynosbati Oestl. and M. houghtonensis Troop have more sensoria on segment IV and the cornicles are short, cylindrical and typical of many species of the genus Myzus. Aphis (Myzus) neomexicanus Ckll. is characterized by antennae much shorter than body, cylindrical cornicles which do not reach tip of abdomen, and by black markings on abdomen of winged female. Myzus ribifolU Davidson is readily separated by the cornicles which are typically 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 Entomological Society of Canada (1863-1871); Entomological Society of Canada (1951- ); Entomological Society of Ontario. Ottawa [etc. ] Entomological Society of Canada [etc. ]
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