1910.] NATURAL SCIENCES OF PHILADELPHIA. 383 



brush often agglutinated into a kind of spur, in addition to which a 

 hirsute sheath may be present. Setae of the middle series (fig. 926) 

 are intermediate in character. Anteriorly on II and III the ventral 

 series is replaced by a dense tuft of several rows of small pin- 

 nate setae (Pi. XXXII, fig. 93) the longer dorsalmost of which 

 have the tips simply prolonged while on the ventral ones they become 

 spirally twisted, and increase in length at the expense of the strictly 

 pinnate region until the most ventral consist chiefly of a spiral of 

 two to two and one-half turns. Posteriorly all neuropodial setae 

 become slender, elongated and more or less spinous, the spines appear- 

 ing at first irregularly and in a restricted region and becoming more 

 regularly biserial and more widely distributed as the setae become 

 longer and more slender (figs. 94 and 95). 



Notopodial setae in the usual two fascicles; the ventral a vertical 

 series of fourteen to eighteen, visible above the felt on the medium- 

 sized type and cotypes (37-48 mm. long); dorsal fascicle arising in 

 two short parallel oblique series of six to eight each, or on elytro- 

 phorous segments sometimes in one series of about fifteen. In each 

 group they increase in size from below dorsally and one or two minute 

 ones may be concealed beneath the felt. Those of the ventral series 

 are bent rather abruptly caudad on to the felt and give an aspect of a 

 series of waves. At the base they are flattened and very stout and 

 taper rather rapidly into the slender ends. Otherwise they are like 

 those of the dorsal fascicle. Setae of the dorsal fascicle penetrate the 

 felt more obliquely, those on elytrophorous segments at a more dorsal 

 level than the others, and are consequently more recumbent on the 

 felt. They curve rather gently dorsad and at the same time taper 

 very gradually into the long slender ends which cross those of the 

 opposite side and on posterior segments often reach the opposite side 

 of the body. All of those setae have a chestnut or pale brown color, 

 are soft, flexible and friable, stout and compressed at the base and 

 taper more or less gently to the tip which is rather abruptly contracted 

 into a hard, pointed, strongly bent hook (Pi. XXXII, fig. 88). 

 They are finely striated longitudinally and the surface of the 

 convex side bears numerous small hard asperities (fig. 89). Pos- 

 teriorly they become more slender and anteriorly much shorter, 

 the former finally terminating in a more open hook and like 

 the lateral felt fibers becoming covered with sticky hairs (PI. 

 XXXII, fig. 96). Felt fibers arise in dense tufts immediately 

 above the dorsal notopodial setae on scale-bearing segments only and 

 spread horizontally in a tangled layer. A smaller tuft arises between 

 25 



