. Sanitary entomology; the entomology of disease, hygiene and sanitation. eph-ahis sanguineus (Latreille) Koch by Christophers in India (fig. 78).Lounsbury proved tlie transmission of the disease in South Africa byHaemaphysails leachi (Audouin) Neumann. According to various au-thors Dermacentor reticulatus (Fabricius) Koch carried the disease in 416 SANITARY ENTOMOLOGY France. Ixodes heaagonus Leach (reduvius Audouin), and /. ricinus(Linnaeus) Latreille, are suspected to be carriers. The life cycle in thedog was worked out by Nuttall and Graham-Smith (1904<-7). The cycleof schizogony is pas
. Sanitary entomology; the entomology of disease, hygiene and sanitation. eph-ahis sanguineus (Latreille) Koch by Christophers in India (fig. 78).Lounsbury proved tlie transmission of the disease in South Africa byHaemaphysails leachi (Audouin) Neumann. According to various au-thors Dermacentor reticulatus (Fabricius) Koch carried the disease in 416 SANITARY ENTOMOLOGY France. Ixodes heaagonus Leach (reduvius Audouin), and /. ricinus(Linnaeus) Latreille, are suspected to be carriers. The life cycle in thedog was worked out by Nuttall and Graham-Smith (1904<-7). The cycleof schizogony is passed in the dog. The free pyriform parasite entersa normal red blood corpuscle and becomes rounded in shape. The parasitethrows out pseudopodia and appears as an amoeba. This stage lasts along time, at the end of which the parasite enters upon a quiescent the organism takes a form called the trefoil stage, in which themain mass of the chromatin, much reduced in size, lies at the base ofthe two processes. Two nuclei are formed, finally the cytoplasm divides. LIFE CYCLE OF BABESIACANIS The. Cause Of Canine: MALieNANT Jaundice. Fig. 78.—(Pierce). and two pyriform parasites are found lying side by side in one corpuscle now ruptures and liberates the two parasites. Christophers has worked out the cycle of sporogony in the tick. Whenan adult or nymphal tick bites a dog and takes in blood containing theoval parasites, these develop in the gut into round or oval bodies whichfinally assume the form of a club-shaped bod} which gradually becomesookinete. In the adult these ookinetes wander into the ova, while in thenjmph they simply pass into the embryonic tissues. In either case theybecome rounded and form a zygote which breaks up into sporoblasts,and these again into sporozoites which infect the salivary glands of thenymph and the adult of the second generation. A parent tick having gorged with blood falls to the ground and DISEASES CAUSED OR CARRIED BY MITE
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