228 Annals Entomological Society of America _[Vol. VII, 
There were no serious results in this species from the glue 
thrown out from the cornicles of the large species of lice but this 
was probably only accidental and not because of any specific 
resistent character. Once, a small larva, apparently in the 
second instar, was observed to seize a full grown apterous 
Macrosiphum ambrosiae which appeared to be three times the 
size of itself. It first caught it by the right hind foot. The 
louse struggled, dragging the larva about for a minute or two 
and extruded glue from the left cornicle. The larva then 
managed to get hold just behind the right cornicle and pro- 
ceeded to feed on the louse, though dragged about somewhat. 
by the latter. Two and a half hours later it was found still 
feeding on the louse, which was still living, but had extruded 
no glue from the right cornicle on which side the larva was 
holding it. Unless for some reason the right cornicle contained 
no glue, this action of the louse seems to be explained only by 
awkwardness or stupidity. Indeed, the cases were extremely 
few when the louse seemed to make any well directed effort to 
smear its enemy. 
Perhaps next in order might be classed several forms of 
Adalia Muls., namely, melanopleura Lec., annectans Crotch, 
coloradensis Casey, and humeralis Say. As these four forms 
interbreed freely and seem to be identical in life history it 
seems best to treat of them here as one species, which indeed 
they undoubtedly are. In the descriptions of the adults, however,. 
they must be treated separately. In the larval and pupal 
stages they seem to be identical in appearance but in the adult 
state are strikingly different. 
For full description of adults of these forms, see Annals of 
. the Entomological Society of America, Volume 4, page 283. 
figg: Fig. J, Plate XIX*. 
Pale to deep amber yellow in color as in the foregoing species. 
Length about 1 mm.; width about .56 mm. 
Larva: Fig. I, Plate X1X*. 
First instar: Head and pronotum shining black, rest of body dull 
black or dark grayish with a median row of paler spots from pronotum 
to tip of abdomen; 2nd instar, the same except lateral and medio- 
lateral pale whitish spots on lst abdominal segment and a median pair 
of whitish spots on 4th abdominal segment; pronotum bordered all 
around with whitish and with median pale line; 3rd and 4th instars; 
color often blackish gray or blue; median and anterior portion of head 
*Annals E. S. A. Vol IV, Sept. 1911. 
