334 ANNUAL REPORT OF NEW-YORK 



APPLE. LIMBS. 



20. Mouldy APHIS, CalUpterus mucidus, new s-pecies. (IIomopteraAphidae.) 



A solitary plant-louse, walking on the leaves or hovering on the 

 wing in their shade, having its body, legs and antennae 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, JTielia CratcBgi, Fitch. (Ilomoptera Mem- 

 bracidse.) [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 w^hite spot 

 on each side, wliich 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 AKi3'0t 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 himaculata and acuminata Fab., the belligera Say, the 

 univittata Harris, and the above species. In my Catalogue of the Ilomopterous 

 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, diifering 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. Fairmaire in his valuable 

 memoir on the 3IembracidcB, 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 TTielia, 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 T%elia of M. Fairmaire 

 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 



