Arizona elegans and Masticophis lateralis harbored five helminth species each; Chionactis occipitalis and Rhinocheilus lecontei harbored three; Masticophis flagellum harbored two and Phyllorhynchus decurtatus harbored one helmin th species.
Arizona elegans, Chionactis occipitalis, Masticophis flagellum, Phyllorhynchus decurtatus and Rhinocheilus lecontei are sympatric in southern California and are found in dry, relatively open areas supporting chaparral, creosote bush, mesquite and sagebrush (Behler and King 1979).
Tetrathyridia have been previously found in Masticophis flagellum from Texas by Conn and McAllister (1990) and from Crotalus atrox, C.
Physaloptera abjecta was originally described from Masticophis flagellum (= Psammophis flagelliformis) from Pennsylvania by Leidy (1856).
The coachwhip, Masticophis flagellum ranges through the southern half of the United States from coast to coast, south to the tip of Baja California and Queretaro, Mexico from below sea level to around 2350 m (Stebbins 1985).
Table 1 Monthly distribution of stages in the seasonal testicular cycle of Masticophis flagellum from Arizona from examination of 91 adult museum specimens.