280 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 
56. Mytilaspis pomorum Bouch6 T 
The following account is from Professor Riley's notes : 
February :\, 1879, on the Department grounds, a small purple-leaved elm badly 
infested by a scale insect, resembling very closely the oyster-tshell bark louse of the 
Apple tree, and which may be that insect. Upon examination it was ascertained 
that the scales contained nothing but eggs and dead females. The eggs are very 
coarsely facetted and perfectly white. This scale insect was also found on the elm in 
Professor Kilty's yard, June 11, 1883. Some twigs that he brought were badly 
infested with it. All the old scales were dead and the young ones were casting their 
last skin. The male scales contained either larv;e in their last stage or pupa*. The 
pupa} are considerably elongated, pale purple, with the anterior median line of abdo- 
men whitish ; eyes dark purple, members colorless. Males issued on the 14th and 
15th. Color of prothorax and abdomen pale purple ; the lateral lobes of mesothorax, 
the anterior margin and the posterior band of metathorax yellowish ; the middle 
field of mesothorax and metathorax purplish; band between wings brownish; eyes 
black ; antenna* and legs purplish with yellowish tinge ; style yellowish. Wings 
slightly brownish. 
57. ELM BARK LOUSE. 
(Lecanium sp.) 
Order Hemiptera ; family Coccid.e. 
The following account is taken from Mr. Forbes' third report : 
On the twigs of the white elm, at Normal, we found, this last season, a large brown 
bark louse, very similar in size, shape, and general appearance to the maple Pulvi- 
naria previous to the appearance of the cottony egg-mass beneath the body of the 
female, but differing especially in the fact that the eggs were not inclosed in the 
waxy filamentous masses or nests characteristic of Pulvinaria. 
As we obtained only the adult female, we had not the material for determining or 
describing the species The matured scales are nearly circular, 5 mm in diameter, 
vaulted, emarginate before and behind, the upper surface more or less shining, dark 
brown, irregularly pitted on the central area (where, however, it is nearly smooth), 
and deeply and irregularly punctured on the sides; below the punctures irregularly 
rugose. The eggs are oval .099 mm in length by .048 mm in transverse diameter. 
Beneath females obtained July 2 were eggs in various stages of development, young 
which had just hatched, and those which had just passed the first molt. 
58. Haj)ithu8 agitator Uhler. 
Order Orthoptera; family Gryllid^e. 
Concerning this insect Professor Riley remarks : 
The eggs from which this insect was bred were found by Miss Murtfeldt, of Kirk- 
wood, Mo. They were thrust between the bark from the sides of the cracks, and on 
some occasions were found in great numbers. The female appears to prefer the corky 
bark of the elm and hackberry iu preference to that of other trees in which to 
deposit her eggs, though they are also frequently found running about on the trunks 
and branches of other trees, in the bark of which they also may deposit. The young 
become fully fledged by the latter part of August, aud egg-laying commences about 
the middle of September and continues until cold weather sets iu. The larva', as 
well as the mature insects, are chiefly arboreal as well as nocturnal in their habits 
and like their allies, OZcanthns and Orocharis, are lovers of dense foliage. (Un- 
published notes.) 
