244 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



[vol. 50 



The first segment of the thorax is about twice as long as any of 

 those following, which are subequal in length. The coxopodites are 

 adjacent to and extend along the lateral margin of the segment, 

 being separated by a longtitudinal groove. They extend beyond the 

 post-lateral angles of the segment and are separated from them 

 posteriorly by a fissure, the inner portion cleft being larger than 

 the outer portion. Coxopodites are present on the anterior portion 

 of the underside of the second and third thoracic segments in the 

 form of a sharp tooth. 



Fig. 106. — Bthelum Uberiensis, sp. nov. General figure. 

 Fig. 107. — Bthelum Uberiensis, sp. nov. Coxopodite of first thoracic segment 



(lateral view). X 29. 



Fig. 108. — Bthelum Uberiensis, sp. nov. Coxopodite of first thoracic segment 



(ventral view). X 29. 



Fig. 109. — Bthelum Uberiensis, sp. nov. Second antenna. X 29. 



Fig. 1 10. — Bthelum Uberiensis, sp. nov. Abdomen with uropoda (dorsal view). 



X 2I34_ 



FiG. 111. — Bthelum Uberiensis, sp. nov. Abdomen with uropoda (ventral 



view). X 2154. 



The first two segments of the abdomen have the lateral parts 

 covered by the seventh thoracic segment. The lateral parts of the 

 three following segments are well developed and produced backward. 

 The first, second, and fifth segments are subequal in length, and each 

 is a little shorter than either the third or fourth segments, which are 

 also subequal. The sixth or terminal segment is triangular at the 

 base and has the apex produced in a broad process, with parallel 

 sides and extremity truncate, the post-lateral angles being rounded. 

 The basal article of the uropoda is quadrangular and occupies all 



