234 Annals Entomological Society of America [Vol. Ill, 



Body graduall\' attenuated from near anterior end of caudal third 

 of the length cephalad. more abruptly narrowed or constricted over 

 several segments immediately caudad of the head. Dorsum depressed 

 or sub-complanate, rather more convex cephalad than caudad. Sides 

 sub- vertical. A fine median dorsal keel extending from the anterior 

 margin of the second segment to the caudal end of body. Each side 

 •of the median keel ujKin the dorsum are three conspicuously elevated, 

 sharp edged carinae which extend entirely across the seginent and each 

 of which bears at its caudal end a short clavate seta projecting dorso- 

 caudad; latcrad of the outermost of these dorsal keels is a much thicker 

 keel with wide flat surface which bears a similar seta adjacent to caudal 

 end; between each two of these major carinae is an intemiediate lower 

 carina which bears no seta ; on the side ventrad of the thickened carina 

 above mentioned are two additional, large setigerous carinae and be- 

 tween the thickened carina and the first and between the first and 

 second of these a lower non-setigerous carina; while ventrad of the sec- 

 ond are other lower carinae which become obscure ventrad. Seginents 

 anteriorly transversely furrowed, the -carinae over and cephalad of the 

 furrow lower and weaker but continuous. On the second, third and 

 fourth segments the setae are not borne at caudal ends of the carinae 

 but spring from tubercles contiguous with the carinae at or cephalad 

 of their middles and extend vertically from the surface or nearly so; 

 on the fifth segment are two series of setae, one consisting of setae along 

 caudal margin as on more posterior segments, and the second more 

 cephalad as on the preceding segments, the setae of the two series 

 alternating. 



Cullum or first segment in outline half-moon shaped, the caudal 

 margin being straight and the lateral and anterior margins together 

 evenly convexly rounded or semicircular. Carinae extending only 

 across the posterior half of the segment, the setae being borne at their 

 cephalic ends. A second series of setae toward the cephalic margin. 



Anal plate triangularly narrowed caudad, the posterior margin 

 truncate or weakly wideh' rounded and bearing the usual two long 

 setigerous ])apillae; anteriorly, longitudinally carinate; bearing trans- 

 verse rows of setae of which the most caudal become longer and con- 

 spicuously and finely drawn out apically. 



Anal valves smooth; an obliquely transverse, somewhat curved 

 impression over caudal portion on each side; each valve bearing two 

 pointed setae, one at the caudal edge and one at middle toward the 

 mcsal margin. 



Anal scale transversely somewhat diamond shaped, the meso- 

 caudal and meso-cephalic angles a little rounded; a longitudinal, some- 

 what incurved, impression crossing each side; bearing two pairs of 

 finely pointed setae, one median and between the longitudinal impres- 

 sions and the other near the caudal margin with each seta latcrad of 

 the imjiression of the corresponding side. 



Distal article of first and second legs in the female with a comb- 

 or calamistrum-like series of setae along the ventral surface, the setae 

 being very closely and regularly set. 



