1917] 



McCulloch: Crithidia euryophthalmi 



77 



(2) Intestine 



Infection here somewhat com- 

 parable to that of the mid-stomach 

 of EurynphtJialmus convivus. Spore 

 forms are seldom found here. 



(3) Eectum 



Heavy infection usually present 

 in adults. Spore forms not com- 

 mon. The stages found here are 

 comparable to those of the pyloric 

 expansion of Euryophtlialvius. 



(B) Myonemes 



Usually present in a definite 

 number and position on the body. 



(C) Parabasal body 



Noticeably bilobed along an- 

 terior edge in nearly all of the 

 crithidial stages. 



(D) Parabasal rhizoplast 



Fan-shaped mass made up of 

 numerous, colorless, thread-like 

 fibers. 



No infection has been found in 

 the intestine. 



Spores only have been found in 

 the normal preparations of the rec- 

 tum. Two preparations only from 

 fifty insects showed infection. 



Not readily found and probably 

 occur in no definite position on the 

 body. 



Seldom shows any indication of 

 the bilobed appearance. 



Outline of fan-shaped parabasal 

 rhizoplast clearly defined but no 

 internal structure has been dis- 

 cerned. 



( E ) Blepharoplast 



Some forms show an enlarge- 

 ment at the base of the flagelluo^. 

 This stains lightly and can not be 

 defined as a definite basal granule 

 or blepharoplast. 



(F) Nucleus ■ 



The nucleus not commonly found 

 with a chromatin encrusted mem- 

 brane and a central karyosome. 

 The chromatin is frequently broken 

 up into several granules. 



(G) Degeneration 



Shown by numerous chromidia 

 in cytoplasm, broken up chromatin 

 granules and vacuolated cytoplasm. 



Little evidence to show that 

 there is normally any enlargement 

 which could be regarded as 

 blepharoplast from a purely struc- 

 tural standpoint. 



Nucleus as a rule shows a chro- 

 matin encrusted membrane with a 

 central karyosome. 



Shown chiefly by vacuolated 

 cytoplasm. Entire nucleus may 

 be diffused, but the chromatin is 

 most frequently in the form of 

 a central granule. Chromidia are 

 not numerous. 



(H) Spore forms 



Few preparations show spore 

 forms. 



Almost all of the preparations 

 show a few or many spore forms. 



