540 
ANNUAL HEPOItT OF NEW-YORK 
During their larva state the insects of this order are very 
nimble, skipping and throwing themselves to a distance by strik¬ 
ing their abdomen suddenly against the surface upon which they 
are placed. In their pupa state they are much more slow and 
sluggish in their motions, and become quite active again when 
they reach their perfect state. 
The pupa are like the perfect insects in size and shape, except 
that their wings are short or rudimentary. At first they are 
merely oval scales, situated upon each side of the two last 
segments of the thorax. Subsequently they become more de¬ 
veloped so that they reach to the middle of the abdomen or 
slightly beyond, but they are still incapable of being used for 
Hying. The species under consideration, when in its pupa state, 
is of the same yellow color as when a larva, but the abdomen, at 
least towards its base, is paler than the thorax. 
Tho perfect insect (figure c) is but four hundredths of an inch (0.04) in length 
Its length is indicated by the short lino ne»f 
the left forward leg in the cut. It is thus a 
fourth smaller than Thrips ccrealium , and 
instead of being black like that species, this 
retains the yellow color which it has when a 
larva, the head and thorax (which includes 
the three large segments next to the head, 
from each of which a pair of legs arises, as 
shown in the figure) being of a deep orange 
yellow, or like the yolid of an egg, whilst the 
abdomen is paler, and the legs are yellowish 
white. The antenna; (the apical joints of which 
are represented more enlarged at/) are whi¬ 
tish, tinged towards their tips with dusky. 
The fringes of the wings are also dusky. The fore legs are shorter but no thicker 
than the others. All the other details of its structure are so distinctly represented 
i n the figure, that a particular description is unnecessary. 
The species which I have noticed as the most common upon 
wheat in Washington county, New-York, may be named the 
Three-banded Tiirips (Coleothrips trifusciata). It is clearly dis¬ 
tinct from the three European species included iu this genus, 
though nearly related to the C. fasciata, Lin. It is nearly double 
the size of the wheat Thrips, being 0.07 in length, and is so dis¬ 
tinctly marked that even our preserved specimens can be readily 
discriminated. It is of a black color, polished and shining, with 
the third joint of its antennae white, and its wings black or dark 
