The larvae of this parasite develop in the Malpighian tubules of the insect; at a certain stage they cast their cuticle and make their way into the space - part of the haemocoel - found in the labium.
The excretory (malpighian) tubes are few in number, either four or six.
Lameere's classification is founded on the number of abdominal sterna, the nervuration of the wings, the number of malpighian tubules (whether four or six) and other structural characters.
There are four malpighian tubules.
There are four malpighian tubes, and all five tarsal segments are usually recognizable.