1904.] NATURAL SCIENCES OF PHILADELPHIA. 67 



slightly shorter than the fifth, slightly amplicate, the lateral margins 

 gently rounded; seventh segment compressed, equal to the sixth in 

 length ; eighth and ninth segments together about equal in length to the 

 preceding segment, the ninth with the apical margin rectangulate, the 

 apex with a triangular emargination exposing the rectangulate and 

 carinate apex of the supra-anal plate ; cerci very stout and short, de- 

 pressed, not exceeding the apex of the ninth dorsal segment, subgenital 

 opercule very long, exceeding the tip of the supra-anal plate by the 

 length of the seventh and eighth segments, hastate, carinate, apex 

 rectangulate. Anterior femora three-fourths the length of the meso- 

 notum, basal flexure decided; tibiae equal to the femora in length; 

 metatarsi not quite as long as the remaining tarsal joints. Median 

 femora equal to the first two basal segments of the abdomen in length, 

 anterior and posterior inferior margins as in the male, the inferior 

 median line with five or six spines ; tibiae equal to the femora in length, 

 the structiu"e similar to that of the male but less apparent ; metatarsi 

 but little more than half the length of the remaining tarsal joints. 

 Posterior femora equal to the first two and a half of the third abdominal 

 segments, the margins as in the male, the inferior median line with five 

 or six spines ; tibiae equal to the femora in length and with the structure 

 very similar; metatarsi shorter than the remaining tarsal joints. 



General color (from spirits) dull ochraceous, the nine prominent 

 spines tipped with black; tegmina with the venation dull cream on a 

 blackish ground; wings with the costal and discoidal areas similar to 

 the tegmina, posterior field pearl-white with the nerves purplish- 

 black. 



Measurements. 



6" 9 ■ 



Total length, 78 mm. 134 mm. 



Length of pronotum, 4 " 6.5 " 



Length of mesonotum, 17.5 " 29.5 " 



Length of metanotum (including median seg- 

 ment), 11.5 " 17 " 



I^ength of median segment, 6 " 9.5 " 



Length of tegmina, 10 " 



Length of wings, 10 " 



Length of abdomen, 42 " 82 " 



Length of anterior femora, 14 '' 21.5 '' 



Length of anterior tibiae, 13.7 " 22.5 " 



Length of median femora, ' 12.7 " 18.7 " 



Length of posterior femora, 15.5 " 24.5 " 



Length of subgenital opercule (from extreme 



base), 28.5 " 



