334 
ANNUAL REPORT OF NEW-YORK 
APPLE. LIMBS. 
20. Mouldy aphis, Callipterus mucidus, new species. (Homoptera Aphid® ) 
A solitary plant-louse, walking on the leaves or hovering on the 
W'ing in their shade, having its body, legs and antennse coated 
over, more or less, with pruinose matter resembling fine bluish 
white mould. Pale green, whitish anteriorly, legs and antennae 
black, their bases pale; wings clear and glassy with a small dusky 
or black cloud on the tips of the veins; the rib-vein whitish to 
the stigma, and from thence thicker and coal black. Length 0.075. 
21 , Thorn-bush tree-hopper, Thelia Cratagi, Fitch. (Ilomoptera Mern- 
bracidae.) [Plate ii, fig. 5.] 
On apple trees and more common on thorn-bushes, in July and 
August, standing upon the small limbs, and when approached by 
the finger, leaping away with a sudden strong spring and becoming 
lost to the view. A tree-hopper, shaped like a beech nut, 0.34 
long, black varied with chestnut brown, with a large white spot 
on each side, which is prolonged forwards into a band across the 
front, and with a white band also across the hind part of its back, 
the anterior end of its back with a protuberance extending 
upwards perpendicularly. 
In the present treatise I retain the genus Thelia in its original integrity, as 
proposed by Amyot and Serville, including in it those species only which have 
a horn-like protuberance, more long than wide, arising from the fore part of 
the thorax, and compressed and rounded at its summit. The genus as thus 
limited, embraces the bimuculata and acuminata Fab., the belligcra Say, the 
univittata Harris, and the above species. In my Catalogue of the Ilomoptcrous 
insects in the State Cabinet of Natural History, published in 1851, I proposed 
the generic name Telamona for certain other species which could not be referred 
to any of the genera in Amyot and Serville’s work, dilfering from Thelia in 
having a protuberance jutting up from the middle instead of the anterior part of 
the back, this protuberance being more wide than high when the insect is viewed 
in profile, and more or less square in its form. M. Fairmairo in his valuable 
memoir on the Membraciike, in the fourth volume of the second series of the 
Annals of the Entom. Soc. of France, published a few years previous to my 
Catalogue, and giving much the most full and clear exposition of this group 
that has yet appeared, unites these insects to the genus Thelia, and also 
includes the genus Smilia of Amyot and Serville in the same genus, employing 
the name Smilia for an allied group of insects in which the apical cell of the 
fore wings is quadrangular instead of triangular. The Thelia of M. Fairmairo 
thus becomes an extensive genus, embracing insects which present notable dif¬ 
ferences in their external form. I know not why M. Fairmaire founds a portion 
