_+Musculus iliotrochantericus anticus+_ (Fig. 3).--Covered laterally by the _m. iliotrochantericus posticus_, this slender muscle has a fleshy origin from the anteroventral edge of the ilium between the origins of the _m. sartorius_ anteriorly and the _m. iliotrochantericus medius_ posteriorly. The _m. iliotrochantericus anticus_ is directed caudoventrally and inserts by a broad, flat tendon on the anterolateral surface of the femur between the heads of the _m. femorotibialis externus_ and _m. femorotibialis medius_ and just distal to the insertion of the _m. iliotrochantericus medius_. Action.--Moves femur forward and rotates it anteriorly. Comparison.--No significant differences noted among the species studied. _+Musculus iliotrochantericus medius+_ (Fig. 3).--Smallest of the three _iliotrochantericus_ muscles, this bandlike muscle has a fleshy origin from the ventral edge of the ilium just posterior to the origin of the _m. iliotrochantericus anticus_. The fibers are directed caudoventrally, and the insertion is tendinous on the anterolateral surface of the femur between the insertion of the other two _iliotrochantericus_ muscles. Action.--Moves femur forward and rotates it anteriorly. Comparison.--No significant differences noted among the species studied. _+Musculus iliacus+_ (Figs. 4, 5).--Arising from a fleshy origin on the ventral edge of the ilium just posterior to the origin of the _m. iliotrochantericus medius_, this small slender muscle passes posteroventrally to its fleshy insertion on the posteromedial surface of the femur just proximal to the origin of the _m. femorotibialis internus_. Action.--Moves femur forward and rotates it posteriorly. Comparison.--No significant differences among the species studied. _+Musculus sartorius+_ (Figs. 1, 4).--A long, straplike muscle, the _sartorius_ forms the anterior edge of the thigh. The origin is fleshy, half from the anterior edge of the ilium and from the median dorsal ridge of this bone and half from the posterior one or two free dorsal vertebrae. The insertion is fleshy along a narrow line on the anteromedial edge of the head of the tibia and on the medial region of the patellar tendon. Action.--Moves thigh forward and upward and extends shank. Comparison.--In _Loxia_ and _Spinus_, only one-third of the origin is from the last free dorsal vertebra. In _Hesperiphona_, _Carpodacus_, _Pinicola_, and _Leucosticte_, only one-fifth of the origin is from this vertebra.