26 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 67 



Pergande left the following notes: "Pale yellow and slightly 

 pruinoiis. Apex of antennal joints 3-6 and terminal one-half of the 

 spur blackish; apex of tibiae and tarsi dusky, eyes brown. The 

 nectaries are sometimes very pale brownish, also the legs, with 

 extreme tip of nectaries dusky." 



Biology. — This species alternates between various species of 

 Ribes and such plants as Sonchus, Lactuca, etc. 



On Ribes it occurs on the leaves, usually on the underside, often 

 causing them to curl and cluster. Sometimes it is associated with 

 Myzus ribis (Linnaeus). It is probable that a few individuals remain 

 throughout the year, but most of them have left by the latter part 

 of July. 



On the summer hosts it is very numerous on the leaves, stem, and 

 flower heads. It produces two or more generations, remaining on 

 these plants until late autumn, we having records as late as No- 

 vember 24, and on a potted plant of Sonchus as late as January 24. 



In the autumn it returns to Ribes, where the eggs are laid. The 

 earliest record we have in this country of the sexual forms is October 

 21, and females have been found until late in November. 



The eggs are laid on the twigs of currant and are shining black in 

 color. Van der Goot found nearly mature oviparous females on 

 Deutzia crenata. 



Miss Jackson reports it to be attacked by Empusa (Entomophthora) 

 aphides Hoffman and Empusa {Triplosporium) fresenii Nowakowaki. 

 Theobald found it in the crops of young fowls. 



Food plants. — Ribes species, Sonchus species, Lactuca, Lampsana 

 vulgaris, Viburnum opulus, Cichorium endivum, Picris hieracioides, 

 Taraxicum, milkweed (Swain) , Deutzia crenata (Van der Goot) . 



Distribution. — United States, Europe, India, Japan, Argentina, 

 Brazil, and Porto Rico. 



Type. — Kaltenbach's type of lactucae is undoubtedly lost. Speci- 

 mens which I am considering as typical and which agree with 

 descriptions of other authors are in the United States National 

 Museum. 



AMPHOROPHORA DAVIDSONI, new species 



Figs. 27-32, and 139-141 



Amphorophora rubi (Kaltenbach) Swain (not i-uhi Kaltenbach), Univ. Cal. 

 PuVx, vol. 3, No. 1, 1919, p. 54. 



This species can be separated from closely related ones on Ruhus 

 by its shorter cornicles which are subequal with III, by its dark 

 antennae, the distal segments of wliich become lighter, by its long 

 antennal hairs, and by the larger number of sensoria on III, 34-42. 



Alate viviparous female. — Antennae about equal to the length 

 of the body, III dark, the other segments lighter, hairs very con- 

 spicuous, usually longer than the width of the segment, distal seg- 

 ments imbricated, III with 34-42 sensoria, not in a row. Antennal 



