152 RICHARD EVANS. 



that the actual opening is placed on top of a conical 

 elevation. 



The Antennae. — Immediately behind the antennse the 

 papillae on the head are arranged in three or four more or 

 less complete rings, on the second of whichj counting from in 

 front, the eye is situated. The base of the antenna, con- 

 sisting of two segments carrying the usual papillae, is followed 

 by a third segment, on which the scales are arranged in quite 

 a simple and unmodified way. The segment in question is 

 followed by forty-two others similar in character to the first 

 two. Thus the whole antenna consists of at least forty-five 

 segments. 



The Jaws. — The two blades of the jaws present the same 

 structure as they do in most neotropical species. The outer 

 blade has one big tooth, on the inner side of which is situated 

 a small denticle. The inner blade has a large tooth, on the 

 inner side of which is a small denticle folloAved by a diastema, 

 in which a vestige of a second denticle may be seen. A row 

 of ten or eleven small denticles occurs on the inner side of the 

 diastema. 



The Oral Papillte. — These organs have the same struc- 

 ture as in other South American forms, and call for no 

 further remarks. 



The Walking Appendages. — The number of walking- 

 appendages present vary from twenty-four to twenty-eight 

 pairs. The single male specimen in my possession has only 

 tAventy-four pairs, one of the females has twenty-seven pairs, 

 the remaining seven specimens being possessed of twenty- 

 eight. The appendages carry four spinous pads, and on 

 those situated in the mid-region of the body there may be 

 a small remnant of a fifth. Each leg of the last pair has 

 only two pads, which are somewhat reduced in size. Of the 

 legs of the penultimate pair each one carries three pads. 

 The coxal organs are well developed, but in the majority of 

 cases they arc retracted so as to present the appearance of 

 grooves. The renal apertures are situated on the inner side 

 of the coxal organs, with the exception of those of the fourth 



