1905.] 



NATURAL SCIENCES OF PHILADELPHIA. 



797 



length about two-thirds of the remaining 

 portion of the metanotum. Abdomen con- 

 siderably longer than the remaining portion 

 of the body, with a distinct longitudinal 

 median carina and a pair of supplementary 

 lateral carinse, which latter on the caudal 

 margins of the first and second proximal 

 segments are developed with distinct boss- 

 like tubercles, the general surface tubercles 

 of the abdomen are mostly resolved into 

 longitudinal series; fifth segment with the 

 caudal section bearing two erect foliaceous 

 lobes similar to those found on the head, 

 but with the margins more regular and 

 not crenulate; first, second and third seg- 

 ments increasing distad in length, fourth, 

 fifth and sixth subequal in length, seventh 

 slightly more than half the length of the 

 sixth, eighth very short, ninth about equal 

 to the seventh in length and with the 

 caudal margin with a very broad shallow 

 median emargination ; subgenital opercule 

 reaching to the caudal margin of the eighth 

 dorsal segment, produced, the apex semicir- 

 cularly emarginate, carinate ventrad. Ce- 

 phalic femora slightly shorter than the pro- 

 notum and mesonotum, strongly depressed, 

 proximal flexure distinct; cephalic tibiae 

 slightly longer than the femora, carinate, in 

 section irregularly pentagonal ; cephalic tarsi 

 with the first proximal joint (metatarsus) 

 slightly longer than the remaining tarsal 

 joints. Median femora slightly shorter than 

 the mesonotum, slightly arcuate, subquad- 

 rate in section, with the ventral carinse 

 supplied at about the proximal third with 

 subtrigonal foliaceous lobes; median tibiae 

 very slightly longer than the femora; me- 

 dian tarsi with the proximal joint very 

 slightly longer than the second, third and 

 fourth united. Caudal femora reaching to about the middle of the 



Figs. 2 and 3. Libethra 

 auritus n. sp. Dorsal view 

 and lateral view of head. 

 (X U.) 



