878 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



20. Tortrix sp. 



This i8 iu general form and markings of the body like Tortrix ftimiferana, but the 

 head and prothoracic shield are entirely different. Head flattened, a double dark 

 lateral line, the two connecting with the dark lower edge of the prothoracic shield, 

 which forms a conspicuous lateral line. Head and prothoracic shield copal-brown ; 

 front edge of the clypeus whitish, the white extending around the side of the head 

 above the eyes. Each abdominal segment with four dorsal and three lateral pale- 

 green piliferous warts, which are conspicuous on the reddish-brown body. Supra-anal 

 plate and anal legs dull greenish. Length, 18™™. On leaves of the hemlock August 

 20 to 30. The larva before pupating spins a thin silken cocoon among the leaves. 



21. The hemlock leaf-scale. 

 Aspidiotus ahietis Comstock. 



At Ithaca, N. Y., Professor Comstock 

 found this scale quite common on the lower 

 surface of the leaves of the hemlock. 



Scale of female.— The scale of the female very 

 closely resembles that of Aspidiotus ptni, except 

 that it is usually more nearly circular. This is 

 probably due to the difference in the shape of the 

 leaves which the two species infest. The color 

 of the scale is dark gray, often approaching black, 

 with the margin lighter, and sometimes with a 

 bluish, brownish, or purplish tinge. As with A. 

 jnni, in many specimens of the fully-formed scale 

 the part covering the exuvia is more or less dis- 

 tinct, appearing like a small scale with a light 

 margin superimposed upon a larger scale. Length 

 of scale, 1.3 to 2'"'" (.05 to .08 inch); width about 

 nine-tenths of the length. 



Female.— The last segment of the female pre- 

 sents the following characters : The groups of 

 The mesal and second lobes are well developed; their 

 distal extremities are rounded ; the third lobe of each side is small and acutely 

 pointed. The plates are rather short and irregularly fringed ; there are two between 

 the mesal lobes; two between each mesal and second lobe ; three between each second 

 and third lobe, and usually three laterad of each third lobe. The spines of the dorsal 

 surface are as follows : One laterad of each mesal lobe; one upon each second and 

 third lobe, and one laterad of the most lateral plate. Each ventral spine, with the 

 exception of the first, which is wanting, is situated laterad of the corresponding dor- 

 sal spine. 



Scale of male.— The scale of the male is as wide as that of the female and a little 

 longer. It resembles that of the female in color. 



Male.— The male is of bright orange color, with the thoracic band very dark 

 brown, nearly black. Described from many specimens of each sex. (Comstock.) 



I have found this species not infrequently on the leaves of the hem- 

 lock at Brunswick, Maine, in May. Fig. 298 is from camera drawings. 



Besides the foregoing, the following geometrids were common on the 

 hemlock August 14, p. 867, Nos. 15, 16, 17, 18, 19, 20. 



Also the following: 

 22. Farogyia parallela. 



Fig. 298.- Hemlock leaf-acale 

 enlarged. Packard del. 



spinnerets are wanting. 



