280 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 

 56. Mytilaspis pomorum Bouch6 ? 



The following account is from Professor Eiley's notes : 



February 3, 1871), on the Department grounds, a small purple-leaved elm badly 

 infested by a scale insect, resembling very closely the oyster-shell 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 Riley's yard, June 11, 188:5. Some twigs that he brought were badlj' 

 infested with it. All the old scales were dead and the young ones were casting their 

 last skin. The male scales contained either larviB in their last stage or pupae. The 

 pupae 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 ; antennae and legs purplish with yellowish tinge ; style yellowish. Wings 

 slightly brownish. 



57. ELM BARK LOUSE. 



(_Lecanium sp.) 

 Order Hemiptera ; family Coccid^. 

 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™™ 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"»> in length by .048""™ 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. Hapithus agitator Uhler. 



Order Orthoptera; family Gryllid^. 



Concerning this insect Professor Eiley 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 in 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, and egg-laying commences about 

 the middle of September and continues until cold weather sets in. The larvae, as 

 well as the mature insects, are chiefly arboreal as well as nocturnal in their habits 

 and like their allies, (Ecanthus and Orocharis, are lovers of dense foliage. (Un- 

 published notes. ) 



