£hrips> 
447 
Genus XII. — Ibrips. 
1*N this race of infetfcs the rollrum is fo obfcure, from its 
minutenefs, as to be fcarce perceptible: The antenna; are 
filiform and as long as the thorax ; the body is ot equal 
thicknefs through the whole length, and (lender ; the 
four wings are extended along the back, narrow in pro- 
portion to their length, and eroded at fome diiiaace from 
the bale ; the abdomen is bent upwards, and the feet 
commonly have two articulations. Only five fpecies are 
enumerated under this genus by IAnnxus *■ 
The auimals of this family arc fo minute, that they 
are not objects of difcullion, unlefs viewed with a mi- 
crofeope; to the naked eye they appear rather like atoms 
than living animals. They refide commonly upon 
flowers, and under the bark of trees, and it is there alio 
that their larvte are found, which only differ irom them 
by their wanting wings and elytra. The thrips jurifpe* 
xina, is one of the largeft of this diminutive race ; the 
thorax and abdomen are black, the elytra white. In 
autumn it is found in numbers among flowers, and on 
the juniper. Linnceus, for a long time, was uncertain now 
to arrange it, from not difeovering more than one pair 
of wings f . M. de Geer firft obferved that it had four 
exceedingly narrow ones, with which it (lies but little,, 
but runs quickly f. 
2 
* Syftema Naturje# Ord. II. Gen. ia. 
\ Fauna Swec* i A<£tcs dc Stockholm* p« 1744 ? 
