1062 EXPERIMENT STATION RECORD. 



were dried by both processes and all San Jose scale were found dead 

 at the end of the experiment. 



A new coccicl on birch, H. G. Hubbard and T. Pergande (pp. 13-26). — 

 The article contains an exhaustive technical description of the anatom- 

 ical characters and of the different developmental stages of Xylococcus 

 bet nice. 



The peach lecanium, T. Pergande (pp. 2G-29). — This insect, which has 

 been considered identical with the European Lecanium persicw, is shown 

 to be a new species and is described as L. nigrofasciatum. 



The work against Icerya purchasi in Portugal, with an account of the 

 introduction from America of Novius cardinalis, L. 0. Howard (pp. 

 30-35). — The article gives an account of the successful introduction of 

 the well-known ladybird into Portugal, where it has already cleaned 

 many badly infested orchards. 



Twig primers and allied species, F. H. Chittenden (pp. 35-43). — The 

 habits and life history of Elaphidion villosum are given in detail. The 

 article contains also brief notes on E. inerme, E. subpubescens, E. mucro- 

 natum, E. tectum, E. cinereum, E. irroratum,E. unicolor, and E.imbelle. 



A destructive borer enemy of birch trees, with notes on related species, 

 F. H. Chittenden (pp. 44-51). — The author relates an attack of Agrilus 

 anxius upon the European white birch and other species of birch in the 

 city of Buffalo. Correspondents from that city are of the opinion that 

 unless the ravages of this beetle can be stopped all birch trees in the 

 city will be destroyed. A careful description is given of the different 

 stages of the insect and an account of the literature referring to this 

 species. 



As means of control the author suggests wrapping the birch trees 

 with paper or covering them with whitewash, or the use of hydraulic 

 cement and skimmed milk of the consistency of thick paint. The author 

 says, " Preventives used should be applied to the trees just before the 

 issuance of the beetles, which may be in some localities at least as early 

 as the latter days of May. If paper wrappings are used, they can be 

 removed as soon as the danger season is past, which will be within two 

 or three months of the time of the first appearance of the beetles." 



A new nomenclature for the broods of the periodical cicada, C. L. Mar- 

 latt (pp. 52-58). — In this paper the author proposes a new numbering 

 of the broods of the periodical cicada, so as to show more clearly the 

 relationship of the different broods to one another and their sequence 

 in time of appearance. The 17-year races are placed first, and the 

 broods are numbered from I to XVII, inclusive. These are followed by 

 the 13-year races, of which the broods are numbered from XVIII to 

 XXX. Some of these numbers have as yet no broods assigned to them. 

 The grounds upon which this new numbering is based may perhaps 

 best be stated in the author's own words: "As a rule, the relationship 

 of the broods in point of distribution agrees with their kinship as 

 indicated by their sequence in time of appearance. The relationship 

 indicated by the latter, viz, their sequence in time, is doubtless untrust- 



