THE INTESTINAL FLAGELLATES OF INSECTS 255 



in the bibliography appended to this chapter. Some of the better 

 known hosts and flagellates are as follows : 



Host Flagellate 



[ Embadomonas agilis ^ 



1. TRiCHOPTERA larvsc — I Eutrickomastix (Trichoynustix) 



(Limnophilus rhombicus, [ trichopterce 



" Havicornis, 



Anabolia, Stenophylax, 

 Sericostomu.) 



Eutrichomastix (Trichomastix) sp. ? 

 Tetratrichomastix parisii 

 Monocercomonas sp. ? 



2. DiPTERA larvae — I Polymastix sp. ? 



(Tipnla sp.?) ] Hexamitus sp.? 



Embadomonas agilis 

 Embadomonas alexeieiH 

 Rhicomastix gracilis 



.3. COLEOPTERA — 



Passalus sp. ? (adult) Eutrichomastix (Trichomastix) 



passali. 



Melolontka vulgaris (larva) 



/ Polymastix m-elolonthce 



\ Monocercomonas melolonthce 



^ , • •. f Monocercomonas cetonice 

 Cetonia sp.? \ t>„i i:^r.^-> 



^P \ Polymastix sp 



^ ^ • • /I \ / Polymastix sp.? 



Oryctes nasicorms (larva) | Monocercomonas sp. ? 



r -1 / Lophomonas (several species) 



4. ORTHOPTERA, family BLATTID^- ' ■ \ ^ ^,,ocercomonas orthopterorum 



This list was rather hastily compiled, and is probably incomplete, 

 but a number of problems are suggested. Melolontka, Cetonia, and 

 Oryctes are all representatives of the beetle family scarab^id^ 

 found in regions other than North America. What flagellates are 

 found, if any, in our American scarabaeids? May not other families 

 of beetles include hosts of flagellates of the genera Monocercom- 

 onas and Polymastix? Then, also, the question of specificity and 

 host-specificity of the flagellate comes up here again as in the 

 TRYPANOSOMiD^. Comparative cytological studies on the flagellates 

 of different hosts and cross-infection experiments may be in order. 



The writer has examined and made a few slides of flagellates 

 from the large gut of tipulid larvae taken from a small stream near 

 Lake Roland, Baltimore. Most of the flagellates described by 

 Mackinnon except Rhizomastix were observed. There is now an 



