APHIDIDJ5. 
Ins. 235 
Kesslkr, H. F. Neue Beobachtungen und Eutdeckimgen an den auf 
Ulmus campestris, L., vorkommendeu Apliideu-Arten. Ber. Ver. 
Cassel, xxvi.-xxvii. pp. 67-90, pis. ii. [C/. also Z. ges. Nat. (3) v. 
pp. 494 & 495. 
Relates to Tetraneura alha and ulmi, and Schizoneura ulmi. 
Lichtenstein, J. Chasse et collection des Pucerous. Tijdschr. Ent. 
xxiii. pp. 152-154. 
. Transitory or provisional Insect-Forms. Ent. M. M. xvi. pp. 
224-226. 
Relates chiefly to the Femphigince of Pistacia terehinihus. 
. Les Pucerons du Terebinthe. Feuill. Nat. x. pp. 85-88. 
Several species of Pemphigus, some new, are described in detail, as 
infesting this tree. 
. Observations critiques sur les pucerons des ormeaux et les pucerons 
du Terebinthe. L. c. pp. 124-126. 
Includes a table of 6 galls (one new) infesting the elm. 
Low, F. Zur naheren Kenntniss der begattungsfahigen soxuirten Indi- 
viduen der Pemphiginen. Verh. z.-b. Wien, xxx. pp. 615-620. 
The wingless brood, born from the winged autumn brood, moult four 
times, and increase in size, although they can take no nourishment, for 
want of a proboscis, and this increase is accompanied with both external 
and internal modifications. 
The Femphigince of the poplar, elm, &c., which leave their galls as 
winged insects in summer, subsequently return to the trees under a second 
winged form, as different from the first as if it belonged to another 
genus ; e.g., the first winged form has 6-jointed, and the second 5-jointed, 
antennas. Lichtenstein, SB. z.-b. Wien, xxx. pp. 13 & 14. 
When the winged Aphides are descending to the roots of trees, the 
ants clip their wings, and guide them down ; but when the winged brood 
leaves the earth for the trees, the ants open a path for them. Lichten- 
stein, Bull. Soc. Ent. Fr. (5) x. pp. ciii.-cv. 
There are two groups of Aphides, one annual, passing the winter in 
the egg state, and the other perennial, lying torpid through the winter, 
and capable of resisting any amount of cold ; but the first class are by 
far the most numerous. Lichtenstein, C. R. xc. pp. 80 & 81, and Ann. 
N. H. (5) V. pp. 344 & 345. 
Pemphigus bursarius, L. : life-history, habits, dimorphous forms, &c. 
(including P. Jilaginis, Boyer) ; some forms differ even in the number 
oO joints of the automiao ; id. C. R. xc. pp. 804 & 805, xci. pp. 339 & 340 ; 
OR. Ent. Belg. xxiii. pp. clxii.-clxiv., S. E. Z. xli. pp. 218-222 & 473- 
476, and Ann. N. H. (6) v. pp. 433 & 434, vi. pp. 404 & 405. P. ulmi, 
Licht., = P. pallidus, Hal., = Tetraneura alha, Ratz., but is a true Pem- 
phigus, Lichtenstein, Bull. Soc. Ent. Fr. (5) x. p. Ixxxi.; if = Eriosoma 
pallidus, Hal., nee Derbes, he proposes to rename it P. derhesi, 1. c. 
