NORTH AMERICAN HOMOPTERA. 297 



SEVEI¥TII CONTRIBUTION TO A KNOWI.EnOE OF 

 CERTAIN EITTEE-KNOWN APHIDII>vE.» 



BY CLARENCE M. WEED. 



The observations upon which the present paper is based were made 

 during the Autumn of 1890 at Columbus, Ohio, and the Autumns 

 of 1891 and 1892 at Hanover, N. H. The drawings illustrating this 

 paper were made by Miss Freda Detmers, under my direction, and 

 the photograph for Plate VII was kindly taken for me by Dr. H. 

 H. Lamson. 



Siphocoryne salicis Mouell. 



This species was abundant at Hanover on the leaves and twigs of 

 willow during October and November, 1892. As the leaves fell the 

 sexed forms congregated upon the twigs where the oviparous females 

 deposited their eggs in the crevices about the buds. These eggs are 

 nearly as long as those of MelcDioxanthiLS sallcis, in connection with 

 which they often occur, but they are much more slender. 



Winged Male. — Body 2 mm. long; 0.8 mm. wide; head to tip of folded wings, 

 4 ram.: anteniise, 1.1 mm.; wing expanse, 7 mm. Head blackish; prothorax 

 yellowish or greenish, with a large dusky patch covering most of dorsum ; mesa- 

 and metathorax blackish with a little yellow about base of coxse. Eostrum 

 reaching second coxse, yellowish brown, with a dusky tip. Eyes reddish ; post- 

 ocular tubercles not very prominent. Abdomen yellowish green, often light 

 green, with dusky dots on margins, and large transverse dusky spots on terga 

 of anterior segments; tip of abdomen dusky. Antennae black, third joint lon- 

 gest, a little longer than iv plus v; joints iv, v and basal part of vi subequal ; 

 apical part of vi a little longer than its basal portion, and only about half as 

 long as third joint. Wing membrane a trifle dusky because rather thickly fur- 

 nished with very minute .scale-like objects. Tegulse and wing insertions brown- 

 ish yellow; veins and stigma dusky, especially away from body; cornicles and 

 Cauda blackish, former long and reaching to end of abdomen. A small, acute 

 tubercle on dorsum of penultimate abdominal segment; much less conspicuous 

 than similar tubercle in oviparous female. Legs yellowish brown, with tips of 

 femora and tibite and all of tarsi blackish ; hind pair darker than the others. 



Described from several living specimens on Salix, Nov. 10, 1892 ; 

 some seen in copula with the oviparous form. 



Oviparous Female. — Body 2 mm. long; 1 mm. wide ; antennje 0.7 mm. General 

 color varying from apple green to ochraceous-rufous : oftenest approaching latter, 

 and usually being colored like the buds near which the specimen is stationed, 



* The previous contributions to this series have been published as follows: 

 first, "Psyche," vol. v, pp. 123-134; second, "Psyche," vol. v, pp. 208-210; third. 

 Bulletin Ohio Agricultural Experiment Station, Second Series, vol. i, pp. 148- 

 152; fourth. Bulletin Ohio Agricultural Experiment Station, Technical Series, 

 vol. i, pp. 111-120; fifth, "Insect Life," vol. iii, pp. 285-293; sixth, Bull. 111. 

 St. Lab. Nat. Hist. v. iii, pp. 207-214. 



TEANS. AM. ENT. SOC. XX. (38) NOVEMBER, 1893. 



