512 



The occurrence of overwintering apterous viviparae above ground on 

 apple or Crataegus is uncommon in this latitude, as the Aphids seem 

 unable to withstand the low temperatures. 



The life-history of E. lanigerum in the Ozarks is the same as that 

 recorded for Maine and for Virginia, except that there are probably 

 more than two generations of apterous viviparae on apple and Craiaegus, 

 since there is a period of 5 months between the appearance of the 

 first spring migrants and the first autumn ones, and of 4 months 

 between the last spring migrants and the first autumn ones. Experi- 

 ments with apple-root forms showed that there may be from 6 to 12 

 generations a year, since the apterous viviparae become active by 

 1st March and continue so until some time in November. 



A marked degree of immunity to E. lanigenim has been acc^uired 

 by the elm, susceptibility to attack seeming to be correlated M-ith 

 backwardness of growth in spring. Crataegus crusgalli also exhibits 

 an inherent immunity, and in addition may have a conditional 

 immunity depending upon the season. 



Experiments in transferring Crataegus Aphids to apple and vice 

 versa led to the conclusion that apterous viviparae from apple can 

 establish themselves on Crataegus, though not so readily as on apple ; 

 and that apterous viviparae from Crataegus can become established 

 on apple, though not so readily as those from apple. 



It was proved by experiments on apple seedlings that the Northern 

 Spy apple is immune to E. lanigerum, and that, Avhen it does become 

 established temporarily, this is due to the fact that the Aphids are 

 exceptionally hardy rather than to the fact that the host is congenial. 



The ^^^de range of variation in the antennae of E. lanigerum as 

 determined by measurements in 29 cases, indicates that E. crataegi, 

 Oestl., is a synonym of E. lanigerum, Hausm. 



Barber (G. W.). On the Life-History of SarcopJiaga eleodis, Aldrich. 

 —Jl Econ. Entom., Concord, N.H., xi, no. 2, April 1918, p. 268. 



The parasitisation of Eleodes ohsoleta by Sarcophaga eleodis in Sep- 

 tember in New Mexico is recorded. The beetle was observed to be 

 persistently followed by the fly as it moved over a distance of about 

 8 ft. On coming to rest the fly settled on its back and larviposited on 

 the posterior tip of the left "uing cover. Shortly after the beetle 

 moved the tip of the abdomen, thus exposing the anus, and in the 

 fraction of a second the larva had become active and disappeared 

 "within the body of the beetle through the anus. 



The infested beetle lived for 13 days, and 2 days later the full-grown 

 larva issued, breaking ofi the head of the host in so doing. The larva 

 entered the pupal stage in the middle of March and the adult fly 

 emerged at the beginning of April. 



Trimble (T. M.). Brown-tail Moths taken on Importations. — Jl Econ. 



Entom.] Concord, N.H., xi, no. 2, April 1918, p. 268. 



The interception of a complete nest of Nygmia phaeorrhoea {Euproctis 

 cJirysorrJwea) (brown-tail moth) on European mountain ash (Sorbus 

 aucuparia) is recorded. In view of the risk of fresh infestation of this 

 dangerous pest, the author urges that Congress should pass a cjuar- 

 antine law to prevent the importation of all nursery stock carrpng 



