138 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



Kob. as uudoubtedly a synonym, the extradiscal line is nearly straight 

 near and on the costa; and there can be seen the same dark brown 

 streaks in the brown subapical patch, which are so marked and dis- 

 tinctive in the female. I can recognize this patch, with the points sent 

 outward from it, in Grote and Robinson's excellent colored figure, as 

 well as in one of my specimens. The females of P. leucophcea (and 

 clintonii), of which I have a small one from Florida, are at once dis- 

 tinguished irom those of P. achatina by the outer line ending more 

 obliquely on the costa. Just beyond this line and extending towards 

 the apex are three dark brown longitudinal patches, with the spaces 

 between filled up with brown, the whole forming a large, conspicuous 

 dark brown patch, with ragged edges or points extending towards the 

 outer margin of the wing. I have a male of P. clintonii which has 

 been compared with one in Mr. Thaxter's collection, named for him by 

 Mr. Grote; also one so labeled given me by Mrs. C. H. Fernald; also 

 one so named raised by Mrs. A. T. Slosson from a larva found at Fran- 

 conia, N. H., feeding on Hamamelis the second week in June. It re- 

 mained, she kindly informs me, nineteen days in the cocoon, the moth 

 appearing from June 27 to 30. It seems probable to me that P. hasi- 

 Jiava Pack., P. obliquata G. and R., and P. cinnamomea G. and R. are 

 synonyms of P. clintonii. and that the latter is the same as P. leucophcea 

 of Abbot and Smith. Unfortunately we do not know the appearance 

 of the larva of this species except from Abbot's drawings, as it has not 

 since his time been described and figured. 



191. The European gipsy moth. 



Ocneria dispar (Linu.). 



Plate xxxvil. 



This insect, originally introduced from Europe through an accident 

 by Mr. L. Trouvelot while living in Medford, Mass., about the year 1868 

 or 1869, has become acclimated, and during the summer of 1889 caused 

 " very great alarm," being " very destructive" to fruit and shade trees, 

 including the " linden, elm, birch, beech, oak, poplar, willow, hornbeam, 

 ash, hazel-nut, larch, fir," etc. It is a destructive insect in Europe. 

 The information here given is taken from an illustrated pamphlet pub- 

 lished in 1889 by Prof. C. H. Fernald, entomologist of the Hatch Ex- 

 periment Station at Amherst, Mass., who recommends showering the 

 trees with Paris green in water (1 lb. to 150 gallons) soon after the 

 hatching of the eggs in spring. 



^jrgfs.— Globular, about T^j-inch in diameter, salmon colored, smooth, and laid often 

 to the number of 400 or 500, early in July, on the under side of the branches or on 

 the trunks, or on fences and on the sides of buildings. They do not hatch until the 

 following spring. 



Larva. — Length. 1.75 inches. Body very dark brown, or black, finely reticulated 

 with pale yellow. There is a pale yellow line along the middle of the back, and a 

 similar one along each side. On the first six segments behind the head there is a 

 bluish tubercle armed with several black spines on each side of the dorsal line, and 

 on the remaining segments these tubercles are dark crimson red. On the middle of 



