

Fig. 194. DEVELOPMKXT OF FIl.AK I (H DKA 



A — -Mouth parts of Simutium dnmno»um, fixed in alcohol, cleared in 

 warm clove oil, showing position of larvae of Oiu^hocerca volvulus 

 emerging and in situ, B-E — O. rohttlus (B — Early thoracic form, sec- 

 ond day; C — Thoracic form, seventh day; D--.SliKhtly later thoracic 

 form; E — Proboscis form, ninth day). F — Mature larva of Wurhererui 

 hancrofti escaping from proboscis of Citlex iaiiucnu. G — Larvae of 

 Dirofiiaria repens in AnophfUs (11 days). H — Wyrhfirpria hancrofti 

 larvae two days after entering Aed^a variegatuji. I-Mature larvae of 

 W. hancrofti in thoracic muscle.s and proboscis of itio>^(iuito. J — Em- 

 bryonic development of Loa Ion. K — Detailed drawing r)f Witrhf^rprin 

 hancrofti larva, L — Microfilaria in deeper layers of mnjunctiva in 



rase with disturbance of vision, keratiti.s, and iritis, M — Second larval 

 stage of Onchocerca in the thoracic muscles of Simulum metallicum. 

 uppro.^imately 4H hours after fe.'ding upon infested patient. N — Third 

 larval stage or so-called "sausage form" of Onchorerca on edge of 

 thoracic niusdes of S. or hi arrum several days after feeding upon in- 

 fested case. A-E. after Blacklock. O. B.. 1926. Ann. Trop. Med. v. 

 20 (2). F. after Francis. E., 1919. Hyg. Lab. Bull. 117. G. H, & J. 

 after Fuelleborn. F. Handb. path. Mikr. Jena v. 6. I & K. after 

 Chandler. A. C, 1940 (Figs. Ifiri and IfiO). L-N. after Strong, et al.. 

 19:^4. Contrib. Dept. Trop. Med.. Harvard. VI. 



289 



