26 Bulletin American Museum of Natural History [Vol. XLI1 



Mandibles approximately symmetrical with broad bases, their tips with several 

 finger-like processes; lacinia inobilis broad and toothed distally; two small inner 

 teeth; molar area oval with its surface covered with numerous spinules and four 

 small teeth in front of them. 



Maxillae with palpifer joint-like and seeming to form the first segment of the 

 palpus; a large terminal lobe present, which clasps the stipes on the ventral side and 

 is divided distally into two lobes fringed with seta?; the inner lobe with a row of setse 

 on its inner margin; stipes slightly wider and longer than the palpifer, which bears 

 four inner setse; palpus tapering and with the second segment slender and longer 

 than the first; terminal segment very small and somewhat flask-shaped. 



Labium with palpi barely exceeding the labrum, short; submentum reduced, 

 transverse; men turn broad, cordiform; palpiger transverse, indistinct; palpus short, 

 coverging, distally provided with seta? and expanded with a flare-like margin; articu- 

 lating membranes well developed; ligula slightly exceeding the first segment of the 

 palpus, bowl-shaped and with large rounded papillae at its tip. 



Pro thorax with sides and angles rounded, of the same width as the head. Pro- 

 scutum well developed and entirely chitinized; sagittal line present; anterior and 

 posterior margins with a transverse row of setse; a median transverse row of setae 

 and a prominent lateral seta on each side near the middle. Mesothorax slightly 

 narrower but the same length as the prothorax. Mesoscutum well developed and 

 entirely chitinized; sagittal line present; the posterior margin with a transverse row 

 of seta?, a transverse row on its anterior half and a medio-lateral seta on each side. 

 The metathorax the same except that it is a little narrower. Sterna not noticeably 

 chitinized. 



Legs long, about one-half longer than the thorax is wide; coxae transverse with a 

 slight dorsal groove; femora a little shorter than the tibiae; tarsi claw-like, more 

 than one-fourth the latter in length, with no inner setae but each with two incon- 

 spicuous outer ones. 



Abdomen with ten distinct segments and narrowed caudally. The first eight 

 tergites similar and each covered by a dorsal plate, 1 the anterior margin of which is 

 straight while the posterior is rounded; a transverse row of six setae at each posterior 

 margin and a prominent lateral seta on each side arising from a small tubercle. 

 Spiracles situated just inside and anterior of the lateral seta. Pleural groove distinct. 

 Each segment with a ventral plate 1 less chitinized anteriorly and possessing a trans- 

 verse row of six setae near the posterior margin besides several others just anterior. 

 Ninth segment similar to the preceding ones except that it is slightly longer, four 

 inner dorsal setae are lost, both lateral setae are more posterior, and the median pair 

 of ventral setae at the posterior margin are set a little more anterior. A pair of two- 

 segmented, divergent cerci arise from the posterior margin of the tergite, their points 

 of insertion distant from each other. First segment of cercus tapering, longer than 

 the anal or tenth segment, chitinized, and bearing two dorsal setae near its base, 

 three setae about one-third the length of the segment from the distal end, 2 and a 

 terminal ventral one. Second segment small, slender, cylindrical, only slightly 

 chitinized, its tip flattened, membranous and bearing a terminal seta. 



1 The dorsal plate represents the scutum fused with the epimerites while the ventral plate represents 

 the sternites fused with the episternites (d'Orehymont). 



2 Tiie first segment appears to be subdivided but closer examination disproves it. 



