What is Agnates?

Legal Definition
In the sense of the Roman law were those whose propinquity was connected by males only; in the relation of cognates, one or more females were interposed.

2. By the Scotch lanv, agnates are all those who ar related by the father, even though females intervene; cognates are those who are related by the mother. Ersk. L. Scot. B. 1, t. 7, s. 4.
-- Bouviers Law Dictionary
Legal Definition
In the law of descents. Relations by the father. This word is used in the Scotch law, and by some writers as an English word, corresponding with the Latin agnati, (q. v.) Ersk. Inst. b. 1, tit. 7, ยง 4.
-- Black's Law Dictionary