Handbook of medical entomology . st variousforms of man-infesting tropical insect pests. * The question of the destruction of the mites in the field is some-times an important one, and under some conditions, is states that much can be accomplished by keeping thegrass, weeds, and useless herbage mowed closely, so as to expose themites to the sun. He believes that in some cases good may be doneby dusting the grass and other plants, after cutting, with flowers ofstdphur or by spraying with dilute kerosene emulsion in whichsulphur has been mixed. More recently (1914) he calls a
Handbook of medical entomology . st variousforms of man-infesting tropical insect pests. * The question of the destruction of the mites in the field is some-times an important one, and under some conditions, is states that much can be accomplished by keeping thegrass, weeds, and useless herbage mowed closely, so as to expose themites to the sun. He believes that in some cases good may be doneby dusting the grass and other plants, after cutting, with flowers ofstdphur or by spraying with dilute kerosene emulsion in whichsulphur has been mixed. More recently (1914) he calls attention tothe value of cattle, and more especially sheep, in destroying the pestsby tramping on them and by keeping the grass and herbage closelycropped. 62 Parasitic Arthropods IXODOIDEA OR TiCKS Until recently, the ticks attracted comparatively little attentionfrom entomologists. Since their importance as carriers of disease has been established, interest in \ylnternal I ^/o?,/ \ hypoitoTe Palp arlicte4Art. 3 Shaft 0Chilice-a. Argus persicus. Capitulum of maleAfter Nuttall and Warburton. the group has been enormouslystimulated and now they ranksecond only to the mosquitoesin the amount of detailed studythat has been devoted to ticks are the largest ofthe Acarina. They are char-acterized by the fact that thehypostome, or tongue (fig. 45)is large and file-like, roughenedby sharp teeth. They possessa breathing pore on each sideof the body, above the thirdor fourth coxae (fig. 456). There are two distinct fami-lies of the Ixodoidea, differinggreatly in structure, life-history and habits. These are the Argasidaeand the Ixodidae. We shall follow Nuttall (1908) in characterizingthese two families and in pointing out their biological differences, andshall discuss briefly the more important species which attack consideration of theticks as carriers of diseasewill be reserved for a laterchapter. Argasidae In the ticks belonging tothe famih Argasidae, thereis comparati
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