240 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



[vol. 50 



The head is wider than long, i l / 2 mm. 14 mm., with the front 

 straight and not margined. Epistome flat. Eyes small, round, 

 composite, situated at the lateral margins. The first pair of an- 

 tennas are rudimentary and nearly inconspicuous. The second 

 pair have the first article short ; the second article is about two and 

 a half times as long as the first; the third article is as long as the 

 second ; the fourth is about one and a half times as long as the 



Fig. 96. — Bthclum quadrimaculatum, sp. nov. General figure. X 5. 



Fig. 97. — Ethchim quadrimaculatum, sp. nov. 



segment (dorsal view). 

 Fig. 98. — Ethelum quadrimaculatum, sp. nov. 



segment (lateral view). 

 Fig. 99. — Bthclum quadrimaculatum, sp. nov. 



segment (ventral view). 

 Fig. 100. — Bthclum quadrimaculatum, sp. nov. Abdomen with uropoda (dorsal 



view). X 14. 

 Fig. 101. — Bthclum quadrimaculatum, sp. nov. Abdomen with uropoda (ventral 



view). X 14. 



Coxopodite of first thoracic 



X 14. 

 Coxopodite of first thoracic 



X 14. 



Coxopodite of first thoracic 



X 14. 



third ; the fifth is a little longer than the fourth. The flagellum is 

 composed of two articles, the second one of which is about three 

 times as long as the first. 



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

 those following, which are subequal. The first segment is 2.y 2 mm. 

 long; each of the following is 1^ mm. in length. The coxopodites 

 of the first thoracic segment are wide plates, extending along the 

 lateral margin, but not reaching by a small distance the post-lateral 

 angles of the segment. They are separated by a deep furrow from 



