AMERICAN HOMOrTERA. 387 



These galls open beneath with a slit, the length of which is about 

 one-third of the diameter of the gall ; its direction is usually in, or 

 somewhat oblique to, that of the veins of the leaf, and when oblique, 

 more nearly parallel with the longitudinal axis of the leaf The lips 

 of these slits arc pinched so tightly together as to project out and their 

 margins are either smooth or slightly hairy. Sometimes a leaf contains 

 but a single gall, others two or more. The galls may be scattered 

 irregularly on the leaf, or placed in one or two rows along and near 

 the mid-rib, and one or two dozen may be found in a single row, placed 

 so closely together as. to be contiguous. 



Upon opening one of these galls, I found the mother insect and her 

 eggs, the latter in great abundance, one hundred or more, studded all 

 over the concave surface ; but very few eggs had then (June 7th) 

 hatched. But on opening one of the largest galls, which seemed to be 

 in a much more advanced state, I found the mother insect in the midst 

 of a very numerous brood of newly hatched larvae, and also many ego-s 

 still unhatchedj the new-born larvoe were pale greenish-white, while 

 those more advanced were of a deeper color and of all shades approach- 

 ing to orange; many were already in the pupa state, having short wing- 

 cases. The mother insect moved in a stately manner among her nu- 

 merous offspring, apparently proud of her queenly position. 



On June 18th, the galls ware in prime condition for examinino- the 

 inhabitants; many were opening at the slit beneath and the wino-ed 

 imagos escaping in great numbers. The following is a description of the 

 species. * 



Dactylosphsera hemisphericum, n. sp? 



? Phylloxera caryoc-fjlobuU, Walsh, Proc. Ent. Soc. i, .309. 



Winged Imago. — Light orange yellow, head, autennce, legs, and a baud around 

 middle of thorax blackish; abdomen pointed; wings delicate, hyaline; an- 

 tennae (viewed with a simple lens, apparently 3-jointed. Length of body .04; 

 to tip of wings ,00 inch. 



Microscopic view. — Antennre 5-jointed, the first two, as usual, short and thick : 

 third longer; fourth slender, shorter than third; fifth clavate, longer than 

 third and fourth and about as thick as the third ; these joints do not appear s« 

 evident in all specimens, as sometimes only four are discernable, and some- 

 times the microscope separates the antenna on one side into four joints, and 

 that on the other into five. Piomuscus slightly hairy, 3-jointed, the middle 



*The description of this and the following species were taken from living 

 specimens. In making microscopical examinations, especially of the feet I 

 find it best to place the living insect upon the glass slide, for, when it is anes- 

 thised it rests with the claws contracted under the foot and they cannot, there- 

 fore, be seen; whereas, when the insect is in motion, the claws and digituli 

 are clearly observable. 



