  In this paper, the historical infrared (JHK) data compiled from the published
literature are presented in electronic form for 40 radio selected BL Lacertae
objects (RBLs) for the first time. Largest variations are found and compared
with the largest optical variation. Relations between color index and magnitude
and between color-color indices are discussed individually. For the
color-magnitude relation, some objects (0048-097, 0735+178, 0851+202, 1215+303,
1219+285, 1749+096, and perhaps 0219+428, 0537-441, 1514-241) show that color
index increases with magnitude indicating that the spectrum flattens when the
source brightens while some other objects (0754+100, 1147+245, 1418+546, and
1727+502) perhaps show an opposite behaviour, while remaining objects do not
show any clear tendency; For color-color relation, it is found common that
(J-K) is closely correlated with (J-H) while (J-H) is not correlated with
(H-K).
