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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



[vol. 50 



Head wider than long, 2 mm. : 5 mm., with the frontal margin 

 straight and continuous with the epistome, which is flat. Eyes 

 small, composite, and situated at the lateral margins. The first 

 pair of antennae are small and inconspicuous. The second pair 

 have the first article short; the second is twice as long as the first; 

 the third is about as long as the second ; the fourth is one and a 

 half times longer than the third; the fifth is a little longer than the 



Fig. 102. — Ethelum attenuatum, sp. nov. General figure. X 7 1/5. 

 Fig. 103. — Ethelum attenuatum, sp. nov. Coxopodite of first thoracic segment 



(lateral view). X 14. 

 Fig. 104. — Ethelum attenuatum, sp. nov. Coxopodite of first thoracic segment 



(ventral view). X 14. 

 Fig. 105. — Ethelum attenuatum, sp. nov. Abdomen with uropoda (dorsal 



view). X 14. 



fourth. The flagellum is composed of two articles, the second one 

 of which is two and a half times longer than the first. 



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

 of those following, which are subequal. The first segment is 3 mm. 

 in length. Each of the six following segments is about i l / 2 mm. long. 

 The coxopodites of the first segment form a rather wide and thick- 

 ened border on each side, somewhat wider anteriorly than pos- 

 teriorly, and separated from the segment by a very deep furrow. 

 They do not reach by some distance the post-lateral angles of the 

 segment, and are cleft posteriorly, the fissure not being very deep 

 and the inner portion smaller than the outer portion. The coxopo- 



