Tropical horse tick: effects of solvents on oviposition.

When engorged females of Anoceulor niteus (Neumann) were dipped into one of 130 solvents, those compounds containing 8 or carbon atoms gave 90% or suppression associated with a particular molecular weight could be increased or decreased by selecting another class of solvent; c.g., by using an ether, alcohol, epoxide, aldehyde, or ketone to replace an alkane. Isomeric compounds containing branched carbon chains caused less suppression than straight-chain compounds. Only 2 solvents, 2-methylbutane and nitromethane, were completely without effect.