1920.] NATURAL SCIENCES OF PHILADELPHIA. 243 



Abdomen with all segments longitudinal, those from one to five 

 regularly increasing from twice to four times as long as wide, sixth 

 segment slightly more than three times as long as wide, seventh seg- 

 ment strongly compressed and three times as long as wide, eighth 

 segment elongate quadrate, one and one-half times as long as wide, 

 ninth segment (anal segment) with median length faintly more than 

 greatest width, lateral margins moderately expanding caudad, caudal 

 margin obtuse-angulate emarginate, median line finely sulcate; 

 distal margin of the fourth dorsal segment transversely tuberculate 

 mesad; supra-anal plate small, placed in the emargination of the anal 

 segment, the margin arcuate; cerci slender, styliform, acuminate, 

 but faintly surpassing the lateral portions of the anal segment; 

 sixth ventral segment produced ventrad into a distinct bidigitate 

 process, which is subdepressed, with the processes well separated by 

 a deep median incision and converging distad; subgenital operculum 

 large and broad, but not surpassing the apex of the abdomen, the 

 distal margin subobtusely rounded, the surface of distal portion 

 wTinkled rugulose, a distinct median carina distad. Prosternum 

 slightly transverse, trigonal. 



Cephalic femora subequal in length to that of the head, pro- 

 notum and mesonotum combined, proximal flexure decided and 

 strongly narrowed, dorso -internal margin strongly and ventro- 

 external margin distinctly lamellate developed and serrato-dentate, 

 dorso-external margin not elevated but with six spaced dentations, 

 genicular lobes spiniform; cephalic tibiae damaged. Median femora 

 subequal in length to the three proximal abdominal segments, 

 very faintly bowed, dorso-internal margin with a high trigonal 

 recurved spiniform lobe at the proximal third, distad of which 

 there are from five to six similar but very much smaller tooth struc- 

 tures, dorso-external margin with four similar small structures 

 on distal two-thirds, ventro-external margin with nineteen similar 

 teeth, ventro-internal margin with eighteen to twenty teeth, ventro- 

 medial! carina with five to six teeth; median tibiae slightly longer 

 than the median femora, all the margins finely serrato-dentate, 

 the dorso-internal mesad with an elongate but rather low lobe end- 

 ing distad in a spine, all the carinae subcristate distad and there 

 with several fine teeth; median metatarsi subequal in length to 

 the remaining tarsal joints, dorsad with a low but distinct median 

 carina. Caudal femora slightly longer than the median femora, 

 of similar character, the margins armed with serrato-dentations 

 of a minor grade, as follows — dorso-external, four to eleven; dorso- 



