

was not paralleled by an increase in egg residues. From feces both coumaphos 
and the oxygen analog, mono- and diethyl phosphoric acids, and diethyl phos- 
phorothioic acid were isolated. There was evidence also that some coumaphos 
was completely degraded to phosphoric acid and subsequently incorporated 
into natural phosphorus containing metabolites (376, 377). 
The cattle tick Boophilus microplus (Canestrini) was exposed to labeled 
coumaphos. Using liquid-liquid separation and paper chromatography, a number 
of compounds were found. Ultraviolet and infrared spectroscopy and chroma- 
tography were used to show the presence of unchanged coumaphos, the oxygen 
analog, ethyl phosphate, ethyl phosphorothioate, orthophosphate, desethyl 
analogs, and an unknown metabolite (1243). 
101 
