2 3 8 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



£vOL. 50 



is a minute granule on either side of each one of the thoracic seg- 

 ments. 



Head wider than long, 3 mm. : 7 mm., with the frontal margin 

 straight. Front not margined but continuous with the epistome, 

 which is flat. Eyes small, composite, and situated at the lateral 

 margins. First pair of antennas small and inconspicuous. Second 

 pair of antennae with the first article small; the second article is 



Fig. 90. — Bthelum rotundatum, sp. nov. General figure'. X 4. 

 Fig. 91. — Bthelum rotundatum, sp. nov. Coxopodite of first thoracic segment 



(dorsal view). X 93. 

 Fig. 92. — Bthelum rotundatum, sp. nov. Coxopodite of first thoracic segment 



(lateral view). X gl. 

 Fig. 93. — Bthelum rotundatum, sp. nov. Coxopodite of first thoracic segment 



(ventral view). X gl. 

 Fig. 94. — Bthelum rotundatum, sp. nov. Abdomen with uropoda (dorsal 



view). X gi. 

 Fig. 95. — Bthelum rotundatum, sp. nov. Abdomen with uropoda (ventral 



view). X 93. 



about one and a half times longer than the first ; the third is about 

 as long as the second ; the fourth is a little longer than the third ; 

 the fifth is about one and a half times longer than the fourth. The 

 flagellum is composed of two articles, the second of which is about 

 twice as long as the first. 



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

 following, which are subequal. The first segment is 6 mm. in length. 

 Each of the following six segments is 3 mm. long. The coxopodites 



