246 ENTOMOLOGICAL NEWS. [June, 'lO 



parison with an excellent original sketch of the wingless vivi- 

 parous female which Dr. G. Del Guercio has very kindly sent 

 me. It agrees in every respect even unto the relative lengths 

 of the antennal segments, cornicles and style. The antennal 

 tubercles as shown in this sketch are scarcely perceptible, not 

 more than in some of our specimens, in which this character 

 varies, and in the illustrations given by Jackson. The species 

 seems to better belong under the genus Siphocorync, but this 

 is a contestable point owing to the variations in the antennal 

 tubercles. Another peculiar character in which the American 

 and European forms agree, adding proof to the identity of 

 the two, is the wax glands, mentioned and figured by Jack- 

 son. Kaltenbach speaks of these glands as "ein Strich unter 

 dem Thoraxrande weissbestaubt." From these studies I have 

 concluded that Aphis aquations is synonymous with the Euro- 

 pean "semi-aquatic" aphid, R. nymphaeac, 



I herewith give a translation of Kaltenbach's description of 

 this species, as given in his "Monographic der Familien der 

 Pflanzenlause." 



"One finds these plant lice on various water plants in strong 

 populated colonies.; on the white water-lily (Nymphaa lutca, 

 alba} in the flowers; on the water-plantain (Alisrna plantago} 

 on the flower buds and at the top of the stocks ; on the water- 

 gladiole (Butomus wnbellatus') along the stalks and on the 

 leaves; on the pond-weed (Potamogeton natans}in the rolled- 

 up young leaves and on the peduncle of the same. July to 

 September. 



Wingless female : The antennae are blackish brown, the two basal 

 segments brownish, the third pale. The eyes are brownsh red. The 

 beak reaching to the third pair of legs, is thick, greenish, the two 

 terminal segments blackish brown. The head is yellowish brown ; the 

 third segment of the thorax plainly separated, the abdominal segments 

 combined as one. The whole dorsal surface is olive green with darker 

 marbling, however, there is a longitudinal line along the dorsal median 

 which is moderately constant. The cornicles are moderately long (2-3 

 54 of the normal size), at the base yellowish, towards the distal end 

 brown and before the end somewhat thick. The style is narrow, 

 curved, short, scarcely 1-3 the length of the cornicles and, has the 



