109 



himself experimentally by swallowing the young worms taken from 

 a Blaps. Twenty days later he was seized with severe pains which 

 increased on pressure; diarrhea followed, with ringing in the ears, 

 fatigue, and somnolence. Seventeen days later the characteristic 

 eggs were found in his stools, and twelve days later the symptoms 

 became so severe that he took 8 grams of extract of male fern; one 

 to two hours later he passed 53 of the parasites. For two days the 



Fig. 56. 



Fig. 55. 



Fig. 52. Fig. 53. 



Fig. 57. 



Fig. 54. 



Fig. 58. 



Via.52.—aigantOThynchusmonmformis,tema.\e. X2. (After Grassi&Calandrucoio, 1888,p.523,flg.l.) 



Fig 53 —a. mmiliformis, male. x2. (After Grassi & Calandruocio, 1888, p. 523, flg. 2.) 



FiG.54.— Eostellumof O. monUiformis. Greatly enlarged. (After Grassi & Caiandruooio, 1888, 



"^ Fig 55 -Hooks from same. Greatly enlarged. (After Grassi & Calandruocio, 1888, p. 523, flg. 4. ) 

 FiG.56.-Eggs of G. moniliformis, with embryo. Greatly enlarged. (After Grassi & Calandrucoio, 



1888 D 523 fis. 5. ) 

 Fig 57 — Eggvery greatly enlarged. (After Grassi & Calandruocio, 1888, p. 524, fig. 6.) 

 Fig' 58- V young larva of O. moniliformis in a Blaps; the rostellum is invaginated and the larva Is 

 urromded by a thick inner jelly-like and thin outer cuticular covering. Enlarged. (After Grassi & 



Calandrucoio, 1888, p. 524, fig. 7.) 



