58 



The larvae of the latter principally attack the caterpillars when 

 crossing from one cane to another. 



Remedial measures recommended against L. exempta have already 

 been noticed [R.A.E., A, iii, 359]. Action should be taken directly 

 the larvae are observed. 



Work in Connexion with Insect and Fungus Pests and their Control. — 



Rept. Agric. DepL, Antigua, 1919-20, Barbados, 1921, pp. 11-12. 



The larvae of the Antigua brown hard-back beetle, Lachnosterna, 

 were again abundant in the cane and maize fields. This pest appears 

 to have a life-cycle of about one year, a shorter period than that of 

 the majority of similar larvae in other parts of the world. There 

 seems to be a definite relationship between the appearance of sugar- 

 cane plants attacked by root disease {Marasmius sacchari) and those 

 infested with Lachnosterna. The total losses, which are attributed to 

 the latter by planters, would be reduced by such cultivation and 

 drainage as would eradicate or reduce the root disease. Pigs may 

 be useful in checking Lachnosterna. The Scoliid parasite, Tiphia 

 parallela, is fairly common in the fields, but only three beetle larvae 

 out of 2,500 collected were found parasitised. 



The weevil borer, Metamasitis [Sphenophortis) sericetts, and the 

 moth borer, Diatraea saccharalis, occurred in most cane-fields, but 

 did little or no harm. Diaprepes (Exophthalmus) esitriens was also 

 fairly common, but this weevil is not considered harmful. 



MoRDviLKO (A. K.). SnaKOBbieinn (Aphidoidea). I. [Aphids attacking 

 Graminaceous Plants. T] — |/l3BeCTMfl fleTporpaflCKOM OOnaCTHOM 



CiaHmiM SamnTbi PacieHMM ot BpeflmeneM. [Bull. Pctrograd Div. 



Sta. Protect. Plants from Pests], Petrograd, iii, no. 3, 1921, 

 72 pp., 19 figs. [Received 19th November 1921.] 



This is the first part of a paper in which mention will be made of 

 all Aphids attacking Graminaceous plants, with special consideration 

 of those injurious to cultivated varieties. The general structure, 

 characteristics and bionomics of Aphids, as well as their relation to 

 ants, are described. The present instalment also includes keys* to the 

 subfamilies and tribes, and to the genera and species belonging to 

 the subfamilies Aphidinae and Pemphiginae that attack Gramina- 

 ceous plants. 



The species referred to in these keys include Rhopalosiphiim davisi,. 

 sp. n. {R. howardi, Davis), on the leaves of Elynms canadensis, E. 

 virginicus and Dactylis glomerata in the summer, in North America ; 

 Hayhnrstia, gen. n. (erected for a single species), H. dactylidis, Hay- 

 hurst, on Dactylis glomerata, in North America ; Brachycolus slavae, 

 sp. n., from North Russia, on leaves of Dactylis glomerata ; Toxoptera 

 jaroslavi, sp. n., on Calamogrostis, in the Pskov district ; A. maidis,. 

 Fitch [avenae, Kalt., nee F., nee Mordv.) ; Siphonaphis padi {avenae, 

 auct., nee F.) ; 5. padi americana, subsp. n. {Siphocoryne avenae, 

 Perg., and other American authors) ; Geoktapia areshensis, gen. et 

 sp. n., on numerous Graminaceous plants, in Eastern Transcaucasia ; 

 Aresha shelkovnikovi , sp. n., on roots of rice, in the Elisavetpol district ; 

 Sipha glyceriae, Kalt. (schoutedeni, Del Guer.) ; Sipha {Chaitophorus) 

 fiava, Forbes, on leaves of Panicum sanguinale and other Graminaceous 



* [A translation of portion of these Keys will be published in an early part of the 

 Bulletin of Entomological Research. — Ed.] 



