48 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 10 



segment, on which are inserted levator and depressor muscles arising 

 on the carapace laterad of the eyes (H). Between the cheliceral 

 bases a strong sclerotic bar (A, /) in the anterior body wall connects 

 the epistome with the anterior edge of the carapace. 



The pedipalp coxae are elongate dorsoventrally (fig. i6 D, IICx), 

 as are the coxae of the legs (B). They are implanted in the mem- 

 branous anterior wall of the body laterad of the chelicerae, and their 

 upper ends, which reach almost to the level of the dorsal edges of 

 the cheliceral bases (B, Chi), are weakly articulated on the anterior 

 margin of the carapace. Mesally the dorsal walls of the pedipalp 

 coxae are united with the lateral margins of the epistome (Epst), 

 and along the line of union on each side (ecs) is inflected a broad, 

 platelike epistomo-coxal apodeme (figs. i6C, 17 C, ecAp). There 

 is no median epistomal apodeme in Leiobunum. The musculature of 

 the pedipalp coxa is the same as that of a leg in that it comprises 

 dorsal muscles arising on the carapace (fig. 16 E, /), and ventral 

 muscles {2, j) arising on the corresponding anterior arm of the 

 endosternum (Endst). Each group of muscles includes mesal and 

 lateral fibers representing the promotors and remotors of a leg. One 

 of the ventral muscles of the pedipalp (j), being inserted on the base 

 of the coxal endite, gives this flexible lobe an independent movement. 

 The long muscles of the pedipalp trochanter (4) take their origins on 

 the coxal lamella of the epistomo-coxal apodeme. 



The endites of the pedipalps are broad, soft lobes, each with a pair 

 of small lobules projecting anteriorly from its base (fig. 16 B, F). 

 The flat mesal surfaces of these endites (E) are in apposition before 

 the mouth (B, IIEndt). Each contains in its posterior part a slender, 

 curved, deeply sunken groove (E, c) that runs up into the mouth. 

 The groove is known as a "pseudotrachea" because of its finely ribbed 

 walls, which give it the appearance of a trachea open along the outer 

 side. The endites of the first legs (G, iL) are thick, soft, padlike 

 lobes (B, H, IIIEndt) lying below the level of the mouth (H, Mth). 

 Ventrally they come together under the pedipalp lobes where their 

 extended margins overlap to form a gutterlike channel leading back 

 toward the pharyngeal entrance (B). The small endites of the second 

 legs (G, 2L) project beneath the pedipalp sternum (B, H, IVEndt), 

 and are too far removed from the mouth to have any direct relation 

 to feeding, but they probably have a sensory function. According to 

 Police (1927) each of the four endites associated with the mouth 

 contains a pyriform, sacklike gland, the glands of the pedipalps 

 opening on the dorsal margins of the mesal surfaces of the endites, 



