Fig. 182. DEVELOPMENT OF THE STRONGYLINA 



A-C — Syngamus tracheaii^. (A — Ensheathed second stage larva; B — 

 Third stage larval female; C — Ensheathed young fourth stage larval 

 male). D-F — Syngamus ierei (D — Third stage larva; E — .\nterior end 

 of third stage larva; F — Tail of third stage larva). G — Haemonchus 

 contortus on blade of grass. H-N — OUulanus ti'icuspis (H — First stage 

 larva; I — Second stage larva; J — Tail between first and second stage: 

 K — Third stage (infective) larva; L — Fourth stage female; M — Fourth 



stage male; N — Gravid female). 0-U — Dictyocaulus arnfieldi (0-^Egg 

 from the feces; P-Q — First stage; R — Second stage; S — Third stage; T 

 — Fourth stage male; U — Fourth stage female). A-C, after Ortlepp. 

 1923, J. Helm. v. 11. D-F, after Buckley, 1934, J. Helm. v. 72. G, 

 after Ransom, 1906, U. S. Bur. An. Ind. Circ. 93. H-N, after Cameron, 

 1927, J. Helm. v. f>. O-II. after Wetzel and Enigk, 1938, Arch. Wiss. 

 u. prakt. Tierheilk. 73(2). 



274 



