14 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 92 



^4. Muscidus rcmotor II antennae (fig. 4). — This short muscle 

 arises partly on the head carapace where it fuses with the basipodite 

 and partly on the upper edge of the membranous pouch below the 

 basipodite. It passes backward to its insertion on the posterior part of 

 the sickel-shaped rod mentioned above. The membranous pouch is 

 pulled backward and downward by its contraction. 



?5. Muscidus prodnctor iscJiiopoditis II antennae (fig. 4). — This 

 muscle arises on the proximal median portion of the basipodite and is 

 attached to the outer proximal border of the ischiopodite, which it 

 moves outward and downward. 



Fig. 4. — The second antenna. 



SS, musculus promoter II antennae ; 34, musculus remotor II antennae ; 

 35, musculus productor ischiopoditis II antennae; 36, musculus reductor 

 ischiopoditis II antennae; J7, musculus productor meropoditis II antennae; 

 38, musculus reductor meropoditis II antennae; J9, musculus productor flagellaris 

 II antennae; 40. musculus reductor flagellaris II antennae. 



Cxpd, coxopodite ; Bspd^ basipodite ; Iscpd, ischiopodite ; Mrpd, meropodite ; 

 Fig, flagellum. 



j(5. Muscidus reductor ischiopoditis II antennae (fig. 4). — A little 

 heavier than the preceding, this muscle arises near it on the inner 

 proximal wall of the basipodite, and is inserted on the inner proximal 

 margin of the ischiopodite, which is pulled strongly inward toward the 

 center by its action. 



J/. Muscidus productor meropoditis II antennae (fig. 4). — This 

 muscle arises on the outer proximal wall of the ischiopodite and is 

 inserted on the outer proximal margin of the meropodite, on which 

 it exerts an outward and downward pull. 



^8. Muscidus reductor meropoditis II antennae (fig. 4). — Like the 

 preceding in size and shape, this muscle originates on the inner proxi- 

 mal wall of the ischiopodite and goes to its insertion on the inner proxi- 

 mal edge of the meropodite, which receives a pull toward the center 

 from it. 



