362 



made in the field in the winter and spring of 1919-20. Comparative 

 notes are given on the genera of the subfamily Micracinae, and keys 

 are given to these genera, and also to the North American species of 

 Micracis, Thysanoes, and Pseudothysanoes, gen. n. Revised descriptions 

 and comparative notes are given of the genera dealt with, and the new 

 subgenera Micracisoides and Psendomicracis are erected. 



The new species described are Micracis biorbis, from hickory ; 

 M. bicornus and M. harnedi, from dead hickory ; M. langsfoni, from 

 the wood of honey locust, hackberry, slippery elm and mulberry ; 

 M. meridianus, from the wood of red-bud ; M. popidi, which is 

 described by J. M. Swaine, in shoots of poplar ; M. swainei, from 

 dead willow ; Thysanoes lobdelli, from oak and maple ; T. berschemiae, 

 from the wood of Berschemia scandens ; Pseudothysanoes drakei, 

 gen. et sp. n., from bark of basswood ; P. lecontei, from oak twigs ; 

 Cryptocleptes dislocatus, gen. et sp. n., from hickory bark and limbs 

 and twigs of pecan ; and Erineosiniis sqiiamosus, gen. et sp. n., from 

 the inner bark of osage orange {Madura pomifera). 



Blackman (M. W.). Descriptions o! Eight new Bark Beetles (Ipidae) 



from Mississippi. — Mississippi Agric. Expt. Sta., Agric. Coll., 

 Miss., Tech. Bull. 10, May 1921, 16 pp., 2 plates. [Received 

 9th May 1922.] 



The new species described are : — Phthorophloeus dentifrons, in dead 

 limbs and twigs of hackberry {Celtis missis sippiensis) ; P. mississippiensis, 

 from the bark of dying wild plum [Prunus angustifolia) ; Phloeosimis 

 enixns, from the bark of Juniperus virginiana ; Pseudopityophthorus 

 gracilis, from the bark of dead limbs of water oak {Quercus nigra) 

 and of Quercus sp. ; Pityophthorus scriptor, from the bark of sumac 

 {Rhus hirta) ; P. natalis, from beneath the bark of dead limbs of red- 

 bud {Cercis canadensis) ; P. liqtiidambarus, from beneath the bark 

 of limbs of sweet gum {Liquidambar styraciflua) ; and Pityogenes 

 meridianus from burrows in loblolly pine {Pinus taeda) and shortleaf 

 pine (P. echinata). 



Lloyd (LL). Red Spiders on Cucumbers and Tomatoes. — 7th Ann. 

 Kept. 1921, Exptt. & Res. Sta., Cheshunt, Herts, 1922, pp. 41-52. 

 [Received 9th May 1922.] 



A detailed account is given of the life-history and habits of the red 

 spider, Tetrajiychus telarins, as affecting cucumbers and tomatos 

 grown tinder glass in England. The remedial measures suggested 

 include cutting out cucumber plants in the middle of the season when 

 their vigour has gone and planting tomatos in their place ; the mites 

 frequently die off on the tomatos in these circumstances. A great deal 

 can be done to prevent attack by keeping down weeds on the nursery 

 and in the neighbouring hedges ; Convolvidus in particular is a preferred 

 plant. Plant pots should be dipped for a moment into boiling water 

 before being used. Large numbers of the mites can be destroyed by 

 pinching out with the fingers the affected parts as they appear on the 

 foliage. The sprays that are recommended against the mites both on 

 the plants and in the greenhouse have already been described [R.A.E., 

 A, ix, 321, 528]. 



