201 



Herbert (F. B.). U.S. Bur. Ent. T!he Genus Matsucoccus, with a 

 new Species. (Hemip.-Homop. Coccidae, Subfamily Margaro- 

 dinae). — Proc. Ent. Soc, Washington, B.C., xxiii, no. 1, January 

 1921, pp. 15-22, 1 plate. 



The genus Matsucoccus, erected by Cockerell in 1908 for the reception 

 of Xylococcus matsumurae from pine in Japan, is redescribed ; two 

 other species infesting pines in America are included in it, a key to 

 them being given. M. acalyptus, sp. n., was taken from exposed 

 portions of the needles of the single-leaf pinon [Piniis monophylla) in 

 Southern Idaho. M. matsumurae, Kuw., occurs on the twigs of 

 pine [Pinus thunhergii, P. virginiana and P. rigida) in America, where 

 it is causing considerable damage. There is probably only one 

 generation a year, the larvae hatching in the spring and setthng on the 

 growing twigs, where they soon become apodous. The gall formation 

 is probably due to the bark growing over the insect. 



ilf. fasciculensis, Herbert, recently described from California on 

 pines, has been made the type of a new genus, Americoccus, by 

 MacGillivray. 



Walton (W. R.). How to detect Outbreaks of Insects and save the 

 Grain Crops. — U.S. Dept. Agric, Washington, B.C.. Farmers' 

 Bull. 835, August 1920, 24 pp., 14 figs. [Received 22nd February 

 1921.] 



This is a revised edition of a bulletin already noticed [R.A.E., A, 

 vi, 14]. The same pests are referred to, and the recommendations 

 made are substantially the same. 



Brooks (F. E.). Pear Borer. — U.S. Bept. Agric, Washington, 

 B. C, Bull. 887, 29th September 1920, 8 pp., 3 plates. [Received 

 22nd February 1921.] 



The pear borer, Aegeria pyri, Harris, is a native species rather 

 widely distributed in the eastern United States. The caterpillars 

 commonly attack pear, apple, Sorhus americana (mountain ash), 

 Amelanchier canadensis (juneberry), Crataegus sp. (thorn), and other 

 plants. The burrows occasionally extend from the bark slightly 

 into the sap-wood. Injury may occur at any point above the ground 

 except on the smaller twigs. Places with a rough surface and borders 

 of mechanical wounds or of the mines of other borers are specially 

 liable to attack. 



Larval activity begins early in the spring, and is marked by the 

 presence of fresh, reddish castings. The caterpillar hibernates in the 

 burrow. Some are mature in autumn, and construct cocoons in spring 

 without further feeding. In West Virginia, caterpillars from early- 

 laid eggs usually transform to adults in the following season, thus 

 having a one-year cycle. Those from late-laid eggs spend two winters 

 in the tree. 



The burrows are often opened and the occupants removed by wood- 

 peckers. Perhaps 50 per cent, of the caterpillars and pupae are 

 destroj^ed by parasites, including Microhracon sp., Phaeogcnes ater. 

 Cress., Lissonota sp., Itoplectis annulipes, Brulle, Macroccntrus sp., 

 Ephialtes aequalis, Prov., Tetrastichus sp., and Stilbopoides sesiavora, 

 Roh. 



(2758) Wt.P.3,184 1,500 5/21 Harrow P 



