550 EXPERIMENT STATION RECORD. 



have been found to contribute to the food of the two species of dragonflies in 

 both nymphal and adult stages, are given. A brief account is also given of the 

 life history of P. flavescens. 



A study of the food habits of the Hawaiian dragonflies, A. Warren {Col. 

 Haicaii Bid. 3 (1915), pp. ^.5. figs. 55). — This is a more extended report of 

 investigations by the author than that noted above. 



" It was found that the two species of dragonflies studietl have a fairly wide 

 food range among the insects of Hawaii. Only four of the twelve possible 

 natural orders of insects are unrepresented in Hawaii. Of the orders present 

 no representatives of the earwig, termites, lace-wing, and grasshopper families 

 were discovered in the food eaten by the dragonflies. This insect might, how- 

 ever, draw on any flying group of insects for its food supply, and there is no 

 doubt that if these researches are continued insects of the excepted groups will 

 be found to be occasionally included. 



" In addition to the insect diet, which is shown graphically in the charts, it 

 will be seen that the nymphs feed rather extensively upon other aquatic animals, 

 those identified being Protozoa, Annulata, Mollusca, Crustacea, tadpoles, ami 

 fish." 



Hoplothrips corticis: A problem in nomenclature, J. D. Hood (Entomolo- 

 gist, 48 (1915), No. 62It, pp. 102-107) .—ThQ author shows that the name T/in>.s 

 corticis, applietl by De Geer in 1773, is valid and points out the changes in 

 nomenclature that must follow. A catalogue which lists all the known species 

 belonging to the several genera alTectetl by the changes in nomenclature is 

 appended. 



Insects of Florida, H. O. Barber (HuI. Awrr. .)[us. \at. //(.<(^. 33 (1914k pp. 

 495-535, fig. 1). — This paper, which deals with the Hemlptera occurring in 

 Florida, gives descriptions of eight new species. 



The pond lily aphid as a plum pest, Edith M. Patch (Science, n. ser., 42 

 (1915), No. 1074' P- 164). — The author has determine<l that plum migrants 

 (alate viviparous forms) of Rhopnlosiphum ntiinplKrw readily accept water 

 plantain (Alisma plantngo-aqitatica), arrowhead (Sagittnria lotifolia). and 

 cat-tail flag (Typhn hitifoUn). and that their progeny are perfectly content with 

 the habitat. Thus it api^'ars tliat the life cycle of /?. i\iimph(r(r includes a 

 residence upon the plum, migrating thence to water plants for the summer 

 and returning to the plum in the fall for the deposition of the overwintering 

 eggs. 



It is said to be one of the most troublesome of the plum aphidids occurring in 

 Maine, inhabiting as it does the shoots and ventral surface of the leaves, but 

 exhibiting a tendency to feed upon the young fruit itself as well as tapping the 

 fruit stems. 



Pink and green aphid of potato (Macrosiphum solanifolii), Edith M. 

 Patch (Maine Sta. Bui. 242 (1915). pp. 20.^-223. figs. 3).— It is iwinted out by 

 the author that when an aphidid which in addition to two favorite food plants 

 accepts others not botnnically related, as is the case with the pink and green 

 aphidid of potato, the problem of control is considerably complicate*! by a new 

 element for every different food plant. The food plants of M. solanifolii re- 

 corde<l by the aiithor include no less than 20 siiecles. representing 10 families. 



This species is found in the spring upon rose bushes, feeding on the succu- 

 lent growth and especially abundant near the flower buds. Migration may take 

 place through wingless as well as winged individuals, usually occurring in 

 Maine from the first to the middle of .July, when a very few scattere*l indi- 

 viduals may be seen upon the potato. Upon the potato they .seem to find the 

 conditions ideal for growth and increase enormously, often covering the tender 



