ENTOMOLOGY 567 



pillars spin white cocoons. Presumably the yellow-inhibiting 

 enzyme in the blood of the blue-green host changes the colour 

 of the secretion of the silk glands of the parasite from yellow 

 to white. 



Coleoptera. — Scott {Bull. Ent. Res., 12 [2], 133-4) records 

 a Ptinid beetle, Trigonogenius globulum Sol. breeding in argol, 

 which is the deposit that separates out in barrels of new wine, 

 and contains a high percentage of potassium bitartrate. 

 A. W. R. Roberts {Ann. App. Biol., 8 [3 and 4], 193-215) has a 

 second instalment of his work on wireworms of the genus 

 Agriotes. He deals mainly with Agriotes obscurus, and with 

 more especial reference to the morphology of the mouth-parts 

 and spiracles. A. G. Boving {Proc. Ent. Soc. Washington, 23 

 [3]; 51-62) describes the larva of the Scarabceid beetle, Popilla 

 japonica, in great detail, and provides a useful key to the 

 identification of the larvse of different genera in the subfamily 

 Rutelinse. The same author, in collaboration with J. H. Wade 

 {Journ. Agric. Res., 22 [6], 323-34), deals with the biology and 

 structure of the larva and pupa of the Tenebrionid beetle, 

 Embaphion muricatum. The great care and detail with which 

 these descriptions are drawn up will serve as a model for future 

 work of this kind. A. d'Orchymont {Ann. Soc. Ent. Fr., 89, 

 1-50) discusses the wing-venation in Coleoptera. 



Orthoptera. — F. Carpenter {Ann. Soc. Ent. Belg., 61, 337-43) 

 has a contribution on the structure of the thorax in Orthoptera, 

 Ubarov {Bull. Ent. Res., 12 [2], 135-63) contributes an 

 important article on the genus Locusta, and concludes that, 

 owing to their great variability, only two species can be dis- 

 tinguished, viz. L. migratoria L, and L. pardalina Walk. The 

 latter he regards as being sufficiently different as to require 

 a new genus, Locustana, for its reception. L. migratorioides 

 and L. danica are phases of L. migratoria, and all three are 

 connected by transitional forms, and are even able to undergo 

 a transformation into each other. L. migratorioides and L. 

 migratoria are swarming phases and L. danica is a solitary one. 

 In the same way L. padalina is the swarming destructive phase 

 of that species, and its form solitaria is the solitary harmless 

 phase. The causes of migration of larval and adult swarms of 

 migratoria are discussed, and the conclusion is arrived at that 

 lack of food has nothing to do with larval swarms, which are 

 chiefly guided by the instinct of gregariousness and thermo- 

 tropism. The flying swarms also are not driven to wander 

 by hunger, and do not feed much during migration. 



Protura. — This primitive order of insects was discovered 

 by Silvestri in 1907, and has been largely overlooked on account 

 of the small size of its members. The most recent contribution 

 towards a knowledge of these forms is by H. E. Ewing {Proc. 



