The original number of tribes, as has been stated, is unknown. It was increased by the acquisition of territory. Possibly the annalists found an obscure trace of the admission of the sixteenth rural tribe—the Claudia—in 504. To that year Livy assigns the coming of Attius Clausus with his host of clients, who were formed into the Claudian tribe.[308] Wissowa[309] suggests that the immigration of the Claudian gens, the date of which did not appear in the original tradition,[310] was arbitrarily assigned to the year in which was recorded the admission of the tribe. This conjecture is supported by the situation of the Claudia, which would place it among the latest of the twenty. With more confidence we may assign the admission of the seventeenth rural tribe—the twenty-first in the entire list—to 495.[311] It must have been the Clustumina.[312] We are certain that there were only twenty-one till 387, when four new tribes were formed, bringing the number up to twenty-five.[313] The twenty-sixth and twenty-seventh were admitted in 358,[314] the twenty-eighth and twenty-ninth in 332,[315] the thirtieth and thirty-first in 318,[316] the thirty-second and thirty-third in 300[317], the thirty-fourth and thirty-fifth in 241.[318] To the year 90 that number is known to have remained unchanged, and the evidence of a temporary increase during the Social War is obscure. On this point Appian[319] states that “the Romans did not enroll the newly admitted citizens in the existing thirty-five tribes for fear that, being more numerous, they might outvote the old citizens in the comitia; but by dividing them into ten parts (?) they made new tribes, in which the new citizens voted last.” This view of an increase in number is confirmed by a statement of Sisenna[320] as to the creation of two new tribes at about that time. Velleius[321] however informs us that the new citizens were enrolled in eight tribes. In the object of the arrangement he agrees with Appian. Next he mentions the promise of Cinna to enroll the Italians in all the tribes. From the connection we should naturally infer that in the opinion of Velleius the new citizens were enrolled before Cinna in eight old tribes; and yet it is difficult to understand how the assembly could be persuaded to visit any group of rural tribes with this disgrace and political disability.[322] As the authority of Sisenna, if not that of Appian, compels us to accept the fact of new tribes, it is better to interpret Velleius in that light.[323] We may suppose then that the eight tribes which he mentions were provided for by the Julian law of 90; and we must accept the statement of Sisenna that in 89 the Calpurnian law “ex senati consulto” created two other new tribes, in which were to be enrolled the citizens admitted under this law. Thus we could account for the ten (?) new tribes mentioned by Appian. As regards the Lucanians and the Samnites, who held out obstinately against Rome, the same