August, '11] GILLETTE: APHIDID.E 385 



Albany, N. Y., July 1. I aKso have specimens from Maryland sent 

 me by Prof. W. G. Johnson. The specimens were taken by him from 

 garden pea, Pisum sativum. This is a very abundant species in Col- 

 orado on both eastern and western slopes where we have taken it 

 from the garden pea, Lathyrus odoratus, alfalfa, Medicago saliva; 

 and sweet clover, Melilotus alba. The examples taken from these 

 plants seem identical with specimens sent in by Professor Cockerell that 

 were taken from pea vines in Sussex, Eng., July 4, 1909. This species 

 has remarkably slender cornicles; the antenna is ringed with black 

 at the distal ends of joints 3, 4 and 5, and in the apterous viviparous 

 female there are from two to five small sensoria near the base of the 

 third joint. See figures 22, 22a, 23 and 24. The drawings are from 

 the European specimens. 



Macrosiphum amhrosice Thos. — Taken at Lawrence, Kans., only. 

 This is a very abundant louse about Fort Collins every year and espe- 

 cially on Ambrosia trifida. We have also taken it on Rudbeckia, and 

 Iva xanthifolia. See figures 25 and 25a. 



Macrosiphum sanborni Gillette. — Taken on chrysanthemums grow- 

 ing out of doors at Hood River, Ore, This louse is common and often 

 quite destructive to chrysanthemums in greenhouses in Colorado. 

 Figures 26 and 26a. 



Plate 16. The following figures of antennae, cornicles and tibiae of Aphididae 

 are from the winged viviparous forms unless otherwise designated: 1 and la, Rhopa- 

 losiphum rhois; 2 and 2a, Amphorophora rubi; 3, third antennal joint of apterous 

 female of same; 4 and 4a, Myzus cerasi; 5 and 5a, Myzus ribis; 6 and 6a, Myzus rosa- 

 rum; 7 and 7a, hind tibia and cornicle of oviparous female of same; 8 and 8a, Phoro- 

 don humuli; 9 and 9a Macrosiphum tanaceti; 10 and 10a, Mac. tulipce; 11 and 11a, 

 Mac. rudheckiae; 12, third joint of antenna of apterous form; 13 and 13a, Mac. sonchi; 

 14 and 14a, Mac. erigeronensis ; 15, the third joint of antenna of apterous form ; 16 

 and 16a, Mac. rosa^; 17, third antennal joint of apterous form; 18 and 18a, Mac. 

 solidaginis; 19 and 19a, Mac. liriodendri; 20, male; 21, hind tibia of oviparous female 

 of the precedmg; 22 and 22a, Mac. pisi; 23 and 24, antenna and cornicle of ovipar- 

 ous female of the preceding; 25 and 25a, Mac. ambrosia:; 26 and 26a, Mac. sanborni. 



The amplification is indicated with each figure. Original, M. A. Palmer, 

 Delineator. 



