2 24 DAVENPORT ACADEMY OF SCIENCES. 



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

 about one-third of the diameter of the gall ; its direction is usu- 

 ally in, or somewhat oblique to, that of the veins of the leaf, and 

 when oblique, more nearly parallel with the longitudal axis of the 

 leaf. The lips of these slits are 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 midrib, 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 openingJ^one,^ofj^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 eggs still unhatched ; the new-born 

 larvae were pale greeenish- white, while those more advanced," were 

 of a deeper color and of all shades approaching to orange ; many 

 were already in the pupa state, having short wing-cases. The 

 mother insect moved in a stately manner among her numerous off- 

 spring, apparently proud of her queenly position. 



" On June i8th the galls were in prime condition for examin- 

 ing theMnhabitants ; many were opening at the slit beneath and 

 the winged imagos escaping in great numbers. The following is 

 a descripticn of the species : 



Dactylosphcera hemisphericum, n. sp.? Walsh., Proc. Ent. Soc, I., 

 309. 



"Winged Imago.— Light orange yellow, head, antennae,] legs, and a 

 band around middle of thorax blackish ; abdomen pointed ; wings delicate, 

 hyaline ; antennae (viewed with a single lens) apparently S-jointed. Length 

 of body .04 ; to tip of wing .06 inch. 



''Microscopic wzVw.— Antennas S-joinied, the first two, as usual, short 

 and thick f.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 so evident in all specimens, as sometimes only four are dis- 

 cernable, and sometimes the [microscope [separates the antenna on one 

 side into four joints, and that^ on the other into five. Promuscus slightly 

 hairy, 3-jointed, the middle joint shortest and thickest, and the third 



