CAMBALOID MILLIPEDS — LOOMIS 31 



genera. The other characters are scattered among the genera in a 

 quite indiscriminate manner and do not appear to be associated in 

 regular groups to any great degree. This condition might be ob- 

 served if only a few of a large number of genera were available for 

 examination, for with additional genera the natural groups might 

 be more clearly shown, as in the reconstruction of a broken prehis- 

 toric pot, where many fragments are necessary before a correct con- 

 ception of the shape and design of the pot may be had. Hence, if 

 a few more genera of this suborder are discovered, it is quite probable 

 that relationships will be better understood, and natural groupings 

 made possible. 



With one exception the members of the Cambaloidea are slender 

 creatures, 15 to 20 times as long as broad, but the genus Choctella 

 is unique, with its stout body only 10 times as long as broad, quite 

 like Spiroholus. In most of the genera a few segments immediately 

 behind segment 1 are constricted and definitely necklike, and this 

 condition is carried to its greatest extreme in Endere^ in striking 

 contrast with Platydere^ Nannolene^ and Ghoctella, which have no 

 noteworthy constriction. Five genera have strong dorsal crests on 

 all but a few segments at each end of the body; three genera have a 

 broad, indefinite swelling on each side of the middle and another at 

 the pore; and in the remaining four genera the segments are uni- 

 formly smooth. In Nannolene and Choctella the pores begin on seg- 

 ment 6 instead of segment 5 as in the other genera, and in Choctella 

 the pores are said to be "in front of the transverse suture of the so- 

 mite." This would locate them in the anterior subsegment and furnish 

 another unique condition for this genus, if it has not been misstated. 



Five of the genera are without eyes, while in seven genera eyes 

 are present and composed of from 4 to 40 ocelli, but the presence or 

 lack of eyes is not associated with other characters, such as dorsal 

 crests or swellings, or secondary sexual characters. The antennae 

 of all genera are clavate or subclavate, with the second or third joint 

 usually longest and joint 5 the broadest, although joints 4 and 6 

 sometimes are its equal. The clypeus has a row of four to six setif- 

 erous punctures, except in Tridere, where the punctures are much 

 more numerous and scattered over the surface without definite ar- 

 rangement. The labrum of all genera has three distinct teeth, and 

 the base is crossed by a series of 14 to 16 setae, except in Tridere, 

 where there are 20 to 24. The mandibulary stipes are recessed for 

 the reception of the antennae in Odachurus^ Pharodere, and Endere; 

 in the other genera they are flat or definitely convex. 



The last segment is without crests or other surface modifications 

 in all genera except Tridere^ which has a definite dorsal ridge pro- 

 duced backward behind the valves into a rather blunt, decurved 



