ECONOMIC ZOOT.OGY ENTOM<)T.()(;^■. 559 



The large larch sawfly (Nematus erichsoni), 1{. S. MACuoiKiAi.L {Jour. Lid. 

 \<ir. \L<ni(U,ii\. l.l {V.)(ir>). SO. 7. pp. 3S5-39Ji, pi. /).— Awordiii.u to the author's 

 (ihscrvatidiis this insect iiiiikes its most persistent attafl<s uixm trees 20 to 70 

 Ncars old. Imt may injure nuich younger trees. Little can he accomplished in 

 liiriitin.i,' tile adult insect, hut the larv;io may he destroyed hy .jarring or hy spray- 

 ing with hellehore or arsenicals. Some help is also received from hirds and 

 I'llier natural enemies ol" the iiest. 



The maple leaf -stem borer or sawfly, W. K. Ukitton (IJiit. Xcics, 11 

 il!)Oi;). \». .0, jip. 313-321. pi. 1. fig. 1). — An insect attack upon the petioles of 

 the leaves of the sugar mai)le has been observed in some localities in ronnecticut 

 for llie ]tast 7 years. The larva' of this pest develop from an egg laid at the base 

 of the leaf and burrow through the petiole, which tiiially I)reaks off, causing the 

 leaves to be shed in May or June. The insect h.ns heen identified as Priophorus 

 occneaulh. a species of sawfly. 



A few jiarasites have heen reared from specimens of the s.awfly. No good 

 resvilts can he e.\])ected in controlling this pest hy application of insecticides to 

 the tree. It is suggested, however, that since the larva- fall from the tree a^nd 

 enter the ground ahout June 15. a large proportion of them might he destroyed 

 by s]irayiug the soil at this time with kerosene emulsion. 



Constriction of twigs by the bag worm and incident evidence of growth 

 pressure, II. vox Schkexk (J/o. Bot. Gard. A>iii. I\i)t.. 17 (IDOIJ). pp. 1.33- 

 /.s7, ]>1.^. 9. figs. 'i). — It was noted that bag worms in attaching the band which 

 holds the bag around the small twigs of arbor vita' caused a swelling at the 

 point where the band was applied and the subsequent death of the terminal 

 portion of the twig. An anatomical study was made of the changes set up in 

 the tissue of the twigs as a result of the attachment of the bag worms. A brief 

 hihliography of the suh.ject is api)ended to the article. 



The recently introduced dung fly parasite, J. Kotinsky (Hdiraii. Forester 

 and Agr.. 3 (IDOd), So. 10, pp. 319-321). — A number of specimens of EiicoUa 

 iiiiptttieiis have been introduced and successfully colonized in Hawaii. This 

 parasite attacks inse<'ts which live in dung. It is hoped that they will be of 

 s(une benefit in controlling the horn tly. 



The British woodlice, \V. M. Webb and C. SillEiM (London: Duckworth <& 

 Co.. 19<iG. pp. X+')'i. />/■>>■. 2'). figs. .j9). — A monographic account is given of this 

 group of Crustacea which are commonly known in the United States as sow 

 bugs. The various species are described in detail and a bibliography of the 

 subject is presented. Mention is also made of the economic relations of such 

 species as are known to attack cultivated plauts. 



Ants, F. Knauer (.Imcm//. Leipsic: B. G. Teuhner, 1906, pp. 156, figs. 

 61). — This is a general treatise on the biolog.v of ants and contains a discussion 

 of the various forms found in ant colonies, care of the brood, construction of 

 nests, and symbiosis of ants with other species of ants, unrelated insects, .•md 

 plants. 



The ant, K. Esciiericii (Die Ameise. Brnnsicick: F. Vieiccg d Son, 1906, 

 lip. 232, figs. 68). — In presenting a general account of ant biology the author 

 makes a study of the geographical distribution and classification of ants, follow- 

 ing this with a discussion of their morphology, anatomy, polymorphism, methods 

 of reproduction, construction of nests, feeding habits, symbiotic relations, and 

 intelligence. 



Harvest mites, or " chiggers," F. H. Chittenden (f/. S. Dept. Agr., Bur. 

 I'ut. ('ire. 77. pp. 6. figs. 3). — The pests commonly known as "chiggers" are the 

 larval forms of harvest mites and are found on bushes, trees, and grass from 

 which they infest man, burrowing in the skin and causing more or less serious 

 inllanmiatiou. The remedies suggested by the author are hot baths with salt 



