409 



WiLDERMUTH (V. L.). California Green Lacewing Fly. — Jl. Agric. 

 Research, Washington, D.C., vi, no. 14, 3rd July 1916, pp. 515-525, 

 ■7 figs., 5 tables. 



Chrysopa cuUfornica, Coq. (green lacewing fly) occurs in Texas, 

 Arizona, New Mexico, Nevada, Lower California, and probably in 

 Utah, The larvae are predaceous on various insects, including : — 

 Bryohia pratensis, Garm. (clover mite), Tetranychus mytilaspidis, Riley 

 (two-spotted mite), T. telarms, L. (red spider), Empoasca mali, Le B. 

 (apple leaf-hopper), Typhlocyba conies, Say (grape leaf-hopper), Psylla 

 pyricola, Foerst. (pear psylla), Hyalopterus arundinis, F. (mealy plum 

 aphis). Aphis gossypii, ' Glov. (melon aphis), A. persicae-niger. 

 Smith (black peach aphis), Macrosijo/mm citrifoUi, Ashm. (citrus aphis), 

 Pseudococcus citri, Risso (mealy bug), Eulecanium pruinosum, 

 Coq. (frosted scale), Chrysomphalus aurantii. Mask, (red scale), Lepido- 

 saphes bechii, Newm. (purple scale), Euthrips tritici. Fitch (wheat 

 thrips), Notophallus viridis. Banks (barley mite) and Toxopfera 

 graminum, Rond. (wheat aphis). Adults appear in southern Arizona 

 from February to May, and again in October and November. Pairing 

 takes place soon after emergence ; egg-laying begins on the following 

 day and may continue for three or four days. No feeding has been 

 observed in the adult stage. The incubation period of the egg varies 

 from 6 to 12 days, the average being eight. The duration of the larval 

 stage varies from 11 to 22 days, with an average of 16 days, and ,t^e 

 number of full-grown Aphids eaten during this period is from 74 to 160, 

 under laboratory conditions. In the field, a larva probably consumes 

 from 300 to 400 young and full-grown Aphids in the course of its 

 development. Pupation takes place in a cocoon attached to a leaf ; 

 the cocoons occur singly or in groups. The duration of this stage 

 averages 16 days in March and 20 days in November. In the Salt 

 River Valley of Arizona, the period between the end of October and 

 the middle of February is passed in the pupal or adult stage. In the 

 same latitude there are at least six generations annually. Natural 

 enemies of C. calif ornica are robber flies (Asilids), certain Rhynchota, 

 Contopus richardsomi (wood pewee) and Chordeiles virginianus (night- 

 hawk). Several parasites occur in California, but these have not been 

 observed in Arizona. 



RoRiG (G.). Achtet auf die Kartoflfelkafer ! [Warning against the 

 potato-beetle.] — Deutsche Landwirtschftl . Presse, Ber\ln, xliii, 

 no. 44, 31st May 1916, p. 376, 1 fig. ,,,,,!,„ 



The German Ministry of Agriculture has issued a circular, dated 

 5th April 1916, drawing the attention of the authorities to the necessity 

 for carefully watching the potato-fields in order that the appearance 

 of Leptinotarsa (Chrysomela) decemlineafa (Colorado potato beetle) 

 may be instantly noted and immediate measures taken. An infestation 

 of the potato fields would be doubly unfortunate in view of the increas- 

 ing importance of potatoes as a national food. 



(C311) Wt.Pl/106, 1,500. 10.16. B.&F.Ltd. Gp.11/3. 



