Noland—Anatomy of Troctes Divinatorius Muell. 
205 
Parasites of Troctes 
In so small an insect, it was rather surprising to find parasites 
so common. As has already been mentioned, gregarines not infre¬ 
quently are found in the mid-intestine. Once a parasitic protozoan 
was recognized in a longitudinal section of the testes. 
The parasite most commonly found is a large nematode worm 
located in the body cavity. The small males and long, coiled 
females were found twisted about in the abdomen, even extending 
into the thorax. Sometimes one female nematode and as many as 
a half dozen of the small males were dissected out of a single 
Troctes. The males are short, less than one twenty-fifth the length 
of the females, whose long bodies are filled with eggs. All the 
specimens of the insect which contained this parasite were gath¬ 
ered from one place—a box which had for several years been kept 
filled with stalks of dried grain to make a breeding place. The 
hosts of the worms were as active as any of the non-parasitized 
individuals, but could usually be detected by their greater size. 
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