338 FIFTH RKPORT OF THE ENTOMOLOGICAL COMMISSION. 



4. The muscle-shaped butternut bark-louse. 



Aapidiotua {Mytilaapia) juglandia Fitch. 



Order Hemiptera ; family CocciDiE. 



Fixed to the bark of the twigs, minute pale brownish scales, like those of the apple 

 bark-louse, but smallerand not curved ; preyed upon by a minute chalcid fly. (Fitch.) 



.5. The hemispherical butternut scale-insect. 



Lecanium juglandifex Fitch. 



Adhering to the bark on the under side of the limbs, a hemispherical dull yellow- 

 ish or black scale about 0.22 inch long and 0.18 broad, notched at its hind end, fre- 

 quently showing a paler stripe along its middle and a paler margin and transverse 

 blackish bands. (Fitch.) 



The males, according to Fitch, are long aacl narrow, delicate two- 

 winged flies, measuring 0.05 inch to the tip of the abdomen and a third 

 more to the ends of the wings. They are of a rusty reddish color, the 

 thorax darker and the scutel and head blackish, this last being sepa- 

 rated from the body by a narrow pale-red neck. The antennae are 

 slender and thread-like, half as long as the body and eight-jointed. 

 Two slender white bristles as long as the body are appended to the tip 

 of the abdomen. This description will apply to most of the males of 

 other species of Lecanium. 



AFFECTING THE LEAVES. 



6. The butternut woolly worm. 



Selandria carycv. Norton. 



Order Hymenoptera ; family Tenthredinid^. 



On the under side of the leaves companies of saw-fly larvae covered with long dense 

 snow-white wool standing up in flattened masses entirely concealing the green worm, 

 eating the leaflets from the outer edge inward, often leaving nothing but the midribs. 



These remarkable objects occasionally, though rarely, appear on the 

 butternut in July. The worm presents the appearance (as described in 



our "Guide to the Study of In- 

 sects," from which the following 

 description and figures are taken) 

 of an animated white woolly or cot- 

 tony mass nearly an inch long and 

 two-thirds as high. The head of 

 the larva is rounded, pale whitish, 

 and covered with a snow-white pow- 

 dery secretion, with prominent 

 black eyes. The body is cylindrical, 

 with eight pairs of soft fleshy ab- 

 dominal legs; the segments are 

 transversely wrinkled, pale pea-green, with a powdery secretion low 

 down on the sides, but above and on the back arise long flattened masses 



Fic. 127. This butternut woolly worm and the 

 saini; (U-privc»l of ita coat. — Froia Packard. 



