H^MAPHYSAI^IS. 



Bearer of protozoon of paludism in dog in S. Africa. Dorsal shield much 

 longer than broad, teeth on lower surface of dart in five rows on each side. 

 H. Leporis palustris, infests the hare. 



H. Leachi. This deserves record as the bearer of the proto- 

 zoon of paludism of the dog in S. Africa. It has the dorsal 

 shield much longer than broad, (female), the dorsal surface of the 

 palpus at least as broad as long (male), and the teeth on the lower 

 surface of the dart (hypostome) in five rows on each side. 



H. Leporis Palustris. Swamp-hare H. is an American species 

 which attacks these wild rodents, but is not reported as a pest of 

 the larger animals. It has the palpi longer than broad in both 

 sexes, and the denticles on the lower surface of the dart (hypos- 

 tome) in two rows on each side. 



DERMACENTOR. 



Dermacentor Reticulatus : retrossal hooklet on dorsal aspect of second 

 palpal article. Body flat, narrowed toward the head, scutum white or irri- 

 descent rose or green. Punctations and hair pores give a netted aspect, 

 young female, male. Geographical distribution : Europe, Asia, America 

 (California, N. Mexico, Texas). Hosts : man, ox, horse, deer, sheep, rhi- 

 noceros. D. Variegatus : scutum deeper brown, thinner covering of silver 

 rust. Probably variety of reticulatus. D. Electus. Body almost hairless, 

 stigmata punctate. Characters, male, female. Distribution : United States, 

 Atlantic and Pacific slopes. Hosts : Dog, man, horse, rabbit, antelope, 

 panther, etc. 



D. Reticulatus. Net Dermacentor. This is distinguished 

 from other species of Dermacentor by the presence of a retro- 

 grade process on the dorsal aspect of the second palpal article. 



Young Female. Body flat ; oval, more narrowed toward head ; 5 

 mm. long, by 2.5 mm. broad ; reddish brown behind scutum ; dorsal 

 shield, (scutum) milk or silver white or irridescent rose or green 

 extends back to opposite legs III, with elliptical outline, notched 

 in front for head (capitulum). Eyes pale brown, a little in front 

 of the middle of the lateral margin. Two marginal grooves from 

 behind the eyes backward ; three grooves from the scutum back- 



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