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We present new analytical self-similar solutions describing a collapse of amassless scalar field in scalar-tensor theories. The solutions exhibit a typeof critical behavior. The black hole mass for the near critical evolution isanalytically obtained for several scalar-tensor theories and the criticalexponent is calculated. Within the framework of the analytical models weconsider it is found that the black hole mass law for some scalar-tensortheories is of the form $M_{BH}=f(p-p_{cr})(p-p_{cr})^\gamma$ which is slightlydifferent from the general relativistic law $M_{BH}=const (p-p_{cr})^\gamma$.Comment: 9 pages, LaTex; v2 references and a comment adde

SELF-SIMILAR COLLAPSE OF A SCALAR FIELD IN DILATON GRAVITY AND CRITICAL BEHAVIOR