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 Hemiuridae 



Parahemiurus merus (Linton) 417 



Paraheiniurus ecuador't, new species 419 



Dinurus harbatus (Cohn) 420 



Dinurus longisinus Looss, 1907 421 



Elytrophallus rnexicanus, new genus, new species .... 421 



Mecoderus oligoplitis, new genus, new species .... 424 



Sterrhurus fusiformis (Liihe) 426 



Lechhochirium microstomum Chandler, 1935 426 



Lecithochirium magnaporum, new species 428 



Lecithochirium muraenae, new species 429 



Derogenes "jaricus (O. F. Miiller) 430 



Theletrum lissosomum, new species 431 



Theletrum gravidum, new species 433 



Aponurus trach'tnoti, new species 434 



Leurodera pacifica, new species 435 



Gonocercella pacifica, new genus, new species .... 437 



Hirudinella clavata (Menzies) 439 



Hirudinella beebei Chandler, 1937 440 



Syncoeliidae 



Paronatrema mantae, new species 440 



Aporocotylidae 



Psetiariuvi tropicum, new species 443 



HOST LIST 445 



SUMMARY AND CONCLUSIONS 451 



LITERATURE CITED 454 



