ECONOMIC ZOOLOGY ENTOMOLOGY. 557 



ntcs alo'idcs, and the larvjT? of Clilronomus niitnphwce n. sp., in tlio leaves of the 

 water lily. 



Observations on the life history and habits of Thereva nobilitata and 

 other species, W. E. Collinge (Jour. Econ. Biol., ^ {1909), No. 1, pp. .1^-18, 

 pi. 1). — Technical descriptions are given of the life stages of T. nobilitata. 



The larvie are said to prefer compact but sandy soils, in which they move 

 •about very actively. In wet and sticky soil they make use of the burrows 

 formed by earthworms, and it was noticed that under these conditions they 

 invariably formed a small chamber off one of the burrows. In one case one 

 was observed feeding upon a small earthworm. Specimens were collected at 

 the roots of currant trees and in various nurseries. 



Contributions toward a monograph of the Scolytid beetles. I, The genus 

 Dendroctonus, A. D. Hopkins {U. 8. Dcpt. Agr., Bur. Eat. Bui. 17, tech. ser., 

 pt. 1, pp. 164, pJs. 8, figs. 95). — This contribution embodies the results of exten- 

 sive, systematic investigations of the genus Dendroctonus carried on by the 

 author during the past 17 years. The anatomical details of the imago, larva, 

 and pupa, which are considered at length, are accompanied by numerous draw- 

 ings. Synopses are given of the morphological and physiological characters of 

 the adults, pupae, and larvfe ; also of the secondary sexual and gallery characters. 

 Tables showing the distribution, host trees and the relation of species to host 

 trees are included. Twenty-four species are recognized, of which seven are 

 here described as new to science. Drawings of the egg galleries and larvte 

 mines and maps showing the distribution of the species accompany the account. 

 A complete bibliography is appended. 



The bark beetles (Scolytidse) of the Iser Mountains, K. Neuwingee (Mitt. 

 Yer. Xaturfr. Rcichcnherg, 3S (1908), pp. 7-12). — Twenty-two species of bai'k 

 beetles collected in the Iser Mountains are listed, with their food plants. 



A new braconid of the genus Elasmosoma, T. D. A. Cockerell (Proc. Ent. 

 Soe. Wash., 10 (1908), No. 3-4, pp. 168, 169). — Elasmosoma vigilans from 

 Boulder, Colo., and evidently parasitic on Formica subpolita, is described as 

 new. 



Development of parasitic hymenoptera, F. Silvestri (Bol. Lab. Zool. Gen. e 

 Agr. R. Scuola Sup. Agr. Portici, 3 (1908), pp. 29-83, pis. 2, figs. 62; abs. in 

 Jour. Roy. Micros. Soc. [London], 1909, No. 2, p. 182). — Part 1 of this article 

 has been previously noted (E. S. R., 19, p. 57). The author here gives an 

 account of the development of Agcniaspis fuscicollis, Encyrtus aphidivorus, and 

 Oophthora semblidis. 



Quack grass, a host of the Hessian fly, P. Hayhurst (Jour. Econ. Ent., 

 2 (1909), No. 3, pp. 231-234). — ^The author reports the discovery of the Hessian 

 fly breeding in quack or couch grass (Agropyron repens) in an isolated field at 

 Forest Hills, Mass., on November 8. 1908. He considers it improbable that the 

 attack was accidental from neighboring gi-ain fields. 



The Tok-tokje (Psammodes sp.) as a grain pest, C. W. Mally (Agr. Jour. 

 Cape Good Hope, 34 (1909), No. 4, pp. 4I6-4I8, fig. 1). — Brief notes are pre- 

 sented on Psammodes reicheri, the larvae of which have been discovered injuring 

 the base of stems of wheat. It is said to attack wheat, oats, barley, and corn. 



Fertilization of clover, L. R. Waldron (North Dakota Sta., Rpt. Dickinson 

 Substa. 1908, pp. 7, 8). — The agency of bumblebees in the fertilization of 

 clover was studietl with and without the bees and with a miscellaneous lot of 

 insects collected in a clover field. The insects were in the cages 48 hours. 



