The incidence of nailbiting in 62 sociopath subjects was compared with that in 62 nonsociopath matched controls utilizing the Cornell Medical Index Health Questionnaire. Results indicated that the incidence of nailbiting in primary sociopaths (48 per cent) was significantly greater (p<.01) than the incidence of nailbiting in the control group (24 per cent). Implications of these findings are discussed in terms of the significance of nailbiting in sociopaths, particularly the relationship of nailbiting and anxiety in primary sociopathy