297 



Hopping (R.). A Review oi the Genus Monochamits, Serv. 

 (Cerambycidae, Coleoptera). — Canadian Ent., OrilUa, liii, no. 11, 

 November 1921, pp. 252-258, 2 plates. ^Received 7th April 

 1922.] 



A key is gi^'en to tlie North American species of Monochamiis based 

 on extensive examinations made by the author. M. obtusus, Casey, 

 M. oregonensis, Lee, and M. scutellatus, Sav, are considered to be 

 three distinct species. M. monticola, Casey, appears to be the true 

 M. oregonensis, Lee. These beetles are pests of conifers, particularly 

 Pinus spp. 



Work connected with Insect and Fungus Pests and their Control. — 



Kept. Agnc. Depi., St. Vincent, 1920, Barbados, 1922, pp. 12-14. 



The work connected with cotton-stainer {Dvsdercus delanneyi) 

 consisted of the pruning of growing stumps and seedlings of silk- 

 cotton trees {Eriodendron anfraduosum) and John Bull trees {Thespesia 

 populnea), as well as the destruction of perennial cotton. The general 

 opinion was that there were probably more stainers in the Island 

 than at the same time in the previous year, but that the attack, generally 

 speaking, was not eariier than usual. The cause of this increase is 

 attributed to indifferent burying of cotton seed manure, the large 

 amount of cotton debris left in the field, and the increased area under 

 the crop during the previous season. Towards the end of the season 

 the degree of infestation varied considerably. It was thought that 

 stainers carried over the close season on StercuUa caribaea growing 

 in the northern part of the island, but the attacks did not decrease 

 towards the south. The degree of infestation was judged by the 

 amount of internal boll disease on the cotton as well as by the numbers 

 of stainers found. Control should be practised on the estates before 

 the insects leave the field. When cotton plants are being destroyed 

 and after their destruction, heaps of cotton seed or cotton seed meal 

 should be placed in cool and shady places on the borders of the field, 

 and any insects trapped should be destroyed by means of a kerosene 

 or gasoline torch. Fresh traps must be used periodically, as constant 

 use of fire renders the bait unpalatable. 



Other pests include Alabama {Aletia) argillacea, black scale [Saissetia 

 oleae], Aphids, and red spider, but they were not responsible for any 

 material damage. Eriophyes gossypii (leaf-blister mite) was found on 

 secondary growth of old plants during the latter part of the season. 



BTallou] (H. a.). Mealy-bug on Cacao.— J^r/c. News., Barbados, 

 xxi, no. 518, 4th March 1922, p. 74. 



In 1921, a collection was made of mealybugs from cacao and other 

 plants in Grenada. These included : Pseudococcus citri, Risso, on 

 cacao pods, twigs, cushions and stems, and on sugar-apple fruit, 

 marigold stems and leaves of CastiUoa ; Philephedra broadimyi, Ckll. 

 (Broadway's mealybug), on cacao cushions and on soursop fruit ; 

 Pseudococcus nipae, Mask., on leaves of avocado, banana, galba 

 [CalophyUnm calaba], guava, orange and pigeon pea ; P. bromeliae, Bch. 

 (pine-apple mealybug), on cacao cushions, ornamental croton stem, 

 mango leaf, pineapple fruit and sugar-cane ; P. longispinus, Targ., 

 on breadfruit leaf ; Phenacoccns grenadensis, Laing, on aster leaf and 

 stem ; and Icerya montserratensis, Ril. & How., on coconut leaf. 



(6551) , u 



