THE CANADIAN ENTOMOLOGIST 



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anterior to cornicles with an impressed dusky dot on each side and a brighter 

 green transverse marking on each side of dorsal median line; also marked with 

 a black dot at base of each cornicle and a transverse dusky band on the dorsum 

 of last abdominal segment. Antenna? black excepting basal two- thirds of III 

 which is whitish. Eyes apparently black. Legs with fore pair whitish excepting 

 at joints and the tarsi which are black; middle and hind pair similarly coloured 

 except the femur is dusky to blackish. Beak pale with tip dusky to black. 

 Cornicles black, and cauda pale greenish to blackish, 



Antennae with relative lengths of segments as in winged form, no sensoria 

 excepting the usual distal ones on segments V and VI, base. Pro thorax bearing 

 a moderate tubercle near the base on each side. Beak reaching a little beyond 

 coxae of the second pair of legs. Cornicles moderately long, curved outwards 

 (fig. 3c) and in live specimens reaching beyond tip of cauda. Cauda conical 

 and typical of the genus. 



Measurements: (Averages) Length of antennal segment III, 0.486; IV, 

 0.230; V, 0.226; VI, base, 0.122; VI, filament, 0.4.52 mm.; cornicles 0. 527 mm.; 

 cauda 0.191 mm. 



Cotypes in the collections of the U. S. and Canadian National Museums, 

 and in the writer's collection. 



Siphonophora achyrantes Monell. 



The type slide (Monell number 125x) of the species described under this 

 name was examined by Monell and the WTiter in February 1914, and it was 



Fig. 29. — "Siphonophora achyranlhes Monl." A. antenna; B, wing; C, cornicle; and D, cauda, of winged 

 viviparous female. Drawn at St. Louis, Mo., Feb., 1914, from type specimen. 



agreed that it was the same as Myzus per sices Sulz. The frontal tubercles and 

 abdominal markings were typical. Other important characters shown in the 

 accompanying drawings (fig. 4) made from the type. 



Macrosiphum ribiellum, n. sp. 



What is here considered as a new species was originally described by the 

 writer as MarcosipJmm cynoshati Oestl.^ Since writing this description the 

 writer has had an opportunity to examine t he type of cynoshati, and finds it 



1. Studies on Aphididae. Annals Ent. Soc. Amer., VoL 2, 1900, p. 38, figs. 



