474 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvii. 



ing native food plants: Rhamniis calif ornica^ Rhainnus crocea^ Umbel- 

 I'ularia calif ornica^ Heteroineles arbutifolia, Quercus agrfolia^ Querciis 

 densi-fiora^ Clematis Ugustlcifolia^ Opulaster capitatiis^ Lonicera invo- 

 Imcrata, Rhus diversiloha^ Primus ilicifolia^ Arbutus menziesii^ Salix 

 Icevigata., Wasldngtonia nuda, SympJioricarpos racemosus, Ribes gluti- 

 nosum, Ceanothus calif ornicus, Ruhiis v It if alius, Troximmi sp., Sojichus 

 olepaceus. Convolvulus sepinni. Convolvulus arvens is, Aesculus calif ar- 

 nica, Plantago major, Solanum dauglasii, Arctostaphylas manzanita, 

 Arcta8ta])liylas sp. (unnamed species from the Yosemite), Quercus 

 chrysolejns, and Eriadictyon calif arnicuin. 



The author's thanks are due to Prof. V. L. Kellogg, under whose 

 direction the work has been done in the entomological laboratory of 

 Stanford University; also to Superintendent MacLaren, of Golden 

 Gate Park of San Francisco, and to Mr. Adolph Holme, in charge of 

 the conservatory of the park; also to Mr. Edward M. Ehrhorn, hor- 

 ticultural officer of Santa Clara County, and to Mr. George A. Cole- 

 man for specimens; also to Prof. T. D. A. Cockerell for material, 

 helpful suggestion, and valuable criticism, and to Prof. A. L. Quaint- 

 ance, the well-known special student of Aleyrodidse, who has most 

 kindly examined the entire manuscript of this paper. The author 

 desires to make an especial acknowledgment to Miss Mary H. Well- 

 man, of Stanford University, wdio has made all the drawings from 

 nature. 



The cotypes of all the species described in this paper are deposited 

 in the collections of the U. S. National Museum. 



LIFE HISTORY AND HABITS. 



In a number of species thei"e have been six stages verified, namely: 

 Egg, three larval, a pupal, and an adult. In all the species which 

 have been under oljservation, the eggs are laid in a circle or an arc of 

 one, one or more rows deep, and three to twenty-eight eggs have been 

 counted in a place; occasionalh^ they are found in an irregular group, 

 but always close together. Each is laid singly, the female standing 

 with her wings somewhat outstretched and her head at the center of 

 the future circle, her body forming the radius. As the eggs leave the 

 abdomen, she raises the tip of her body above the usual level; after 

 each IS deposited, she swings the posterior part of her bod}^ laterally 

 for a short distance and lays another. This is kept up until oviposi- 

 tion is completed or she is disturbed. Often several females will be 

 seen standing near each other upon a leaf where there are no eggs; 

 they keep moving in a restless manner, and gradually the leaf l>ecomes 

 coated with minute, white granules of wax similar to that which is 

 upon their bodies and wings; where there is but one insect at work 

 the wax is regularly circular in shape, l)ut where there are more it is 

 irregular. Usually the eggs are found upon these places, and are 



