850 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



21. CLEANTIS Dana. 



ANALYTICAL KEY TO THE SPECIES OF CLEANTIS. 



a. Flagellum consolidiitod and forming a single piece. Sides of abdomen not sepa- 

 rated by an acnte tooth from lounded posterior portion. 



58. Cleantis occidcntalis, new species. 



a'. Flagellum compost-d of three joints. Sides of al)domen separated by an acnte 

 tooth from rounded posterior portion .59. Cleantis healhii, new species. 



58. CLEANTIS OCCIDENTALIS, new species. 



Body narrow, elongate; surface smooth. 



Head of same width as tlioracic segments, and with a small, median 

 anterior depression. Eyes lateral. First pair of antennje consi.stiug 



of four joints, reaching the middle of the third 

 joint of the second pair of antenna*. Second 

 l^air of antenna; contain six joints (five seen 

 from a dorsal view), the last joint being the 

 flagellum. 



The thoracic segments show a gradual, 

 though marked, decrease in length, the first 

 one being the longest and somewhat excavate 

 on its anterior margin. The epimera of the 

 second, third, and fourth segments are short 

 and narrow, reaching but lialf the length of 

 the segments, wliile those of the last three seg- 

 ments a re broad, with their jwsterior angles pro 

 duced beyond the segments. 



The abdomen is composed 

 of four segments, three short 

 ones and the terminal seg- 

 ment, Avhich bears suture lines 

 indicative of another coalesced 

 segment. The terminal seg- 

 ment is rounded i)OSteriorly. 

 The anterior three-fourths of 

 the segment is raised consid- 

 erably above the posterior 

 fourth, which is flat, and there 

 is a groove in the median line on the posterior third of 

 the anterior i^art of the segment. 



The legs are similar to those of the type species of the 

 genus. The three anterior i)airs increase in length, the 

 third pair being the longest, and all are directed anteriorly. The fourth 

 pair are very short and fold across the body. The last three pairs increase 

 in length, the seventh pair being the longest, and all these are directed 

 posteriorly. The legs are compact and lie folded on tlie ventral side and 

 can not be seen from a dorsal view. 



~v 



^ 



Fir;. 23.— Cleantis occidentalis. 

 X 10. 



Fig. 24. — Maxil- 

 i-U'ED OF Cleantis 

 occidentalis. 

 Greatly enlarg eu 



