CLASSIFICATION 15 
but including a subpupa stage. Mouth parts suctorial.  Pro- 
thorax long. Tarsus terminating in a bladder-lke organ. - 
Fic. 20. 
A B 
Libellula pulchella. A, last nymphal skin; B, imago. Slightly reduced. 
Wings present, rudimentary or absent, the two pairs narrow, 
equal, similar, with few or no veins and fringed with long 
hairs. Abdomen with ten segments. Minute insects. Ex- 
Euthrips tritict. Length, 1.2 mm. 
ample, Euthrips (Fig. 21). About one hundred and fifty 
species have been described. 
