1904.] NATURAL SCIEXCES OF PHILADELPHIA. 81 



first to sixth segments distinctly longitudinal; seventh dorsal segment 

 not more than two-thirds the length of the sixth; eighth segment 

 tectate, shghtly shorter than the seventh, lateral portions with the 

 posterior angles sim.ple and not developed into distinct spines; ninth 

 segment slightly shorter than the eighth, fornicate, apically truncate 

 and with a transverse costa, median carina narroAV and distinct; cerci 

 about ecjual in length to the ninth dorsal segment, and inserted near 

 the apex of the latter, slender, hardly curved ; subgenital opercule not 

 quite reaching the apical margin of the eighth dorsal segment, apex 

 broad, truncate. Limbs very slender. Anterior femora but slightly 

 shorter than the mesonotum and metanotum together, basal flexure 

 slight; tibiae slightly longer than the femora, very slender; metatarsi 

 nearly three times the length of the remaining joints of the tarsi. 

 Median femora slightly exceeding the pronotum and mesonotum in 

 length, slightly bowed, tibiae slightly longer than the femora, meta- 

 tarsi about half again as long as the remaining tarsal joints. Posterior 

 femora ec{ual to the five basal abdominal segments in length, slightly 

 bowed ; tibise exceeding the femora by about the length of the first 

 abdominal segment; metatarsi considerably over twice as long as the 

 remaining tarsal joints. 



? . — Size rather small; form moderately slender; surface generally 

 subsericeous, rather granulose on the mesonotum. Head elongate, 

 depressed, very slightly compressed posteriorly, posterior margin with 

 a distinct narrow median depression ; eyes subglobose ; antenna) almost 

 equal to the head and pronotum in length, basal joint as in the male, 

 the second joint rather stout. Pronotum similar to that of the male. 

 Mesonotum slightly more than four times the length of the pronotum, 

 very slightly and very gradually enlarging posteriorly ; median carina 

 anteriorly distinct, but very narrow, and becomes obsolete posteriorly. 

 Metanotum (with median segment) two-thirds the length of the meso- 

 notum; median carina as in the mesonotum; median segment very 

 short, decidedly transverse. Abdomen ecpial to the head and thorax 

 in length, median carina distinct and becoming quite prominent pos- 

 teriorly, where the segments are decidedly tectate; first to sixth seg- 

 ments longitudinal, the length increasing from the base; seventh seg- 

 ment longitudinal, the apical portion considerably expanded; eighth 

 segment somewhat transverse, carina not very distinct; ninth segment 

 moderately produced, strongly carinate, apical margin with a median 

 triangular emargination, which exposes the acuminate apex of the supra- 

 anal plate; cerci acuminate, extending beyond the ninth dorsal seg- 

 ment by about two-thirds the length of the latter; subgenital opercule 

 G 



