— 148— 



Chordeumidae and Stuxberg has referred this also to Craspedosoma. In the 

 light of these criticisms it will appear that this family needs another re- 

 vision. Until this can be made it will be best to leave the genera as Dr. 

 Packard has arranged them. I therefore append Dr. Packard's table as 

 given in the Transactions Amer. Philos. Soc. XXI, p. 178, omitting of 

 course Lysiopetalum which forms a family of its own.* 



A. — Body not setose; antenna; long; eighth pair of legs of rj* modified, six jointed ; 



genital armature small Pseudotremia Cope. 1 sp. 



Hi xly setose B. 



B. — Body short and thick; eyes triangular; antennae slender; setae one-fifth as lon$^ 



as body is thick; legs short Cryptotrichus Packard. 1 sp. 



Body short and fusiform; eighth pair of legs of $ two-jointed; sette half as long 



as body is thick Trichopetalum I larger. 3 sp. 



Body slender; eighth pair of legs of $ two-jointed ending in a claw; setae very- 

 long; eyeless Scoterpes Cope. 1 sp. 



Like Scoterpes; setae a little shorter; sixth pair of legs of $ greatly swollen 



Zygonopus Ryder. 1 sp. 

 Family 5. LYSIOPETALIDAE Wood. 

 This family as now restricted consists of the single genus Lysiopeta- 

 lum Brandt, with a single species L. lactarium Packard, the form origin- 

 ally described by Say as lulus lactarius. 



Family 6. IULIDAE Leach. 

 The three American genera of Iulidae may be characterized as 

 follows: 



A. — Body long and slender; segments 59; scuta strongly carinate; antennae short 



and thick; eyes in a linear series Cambala Gray. 1 sp. 



Scuta not strongly carinate B. 



B. — Scutum of second segment produced at the sides so as to reach the head; antenna- 

 short and thick, the joints shorter than broad Spirobolus Brandt. 5 sp. 



Scutum of second segment not produced; antennae more slender; the joints 

 much longer than broad lulus Brandt. 19 sp. 



III. CHILOPODA. 



The Myriapods of this order are comprised in four well marked 

 families all of which are represented in North America; they may be 

 separated as follows; 



* I also append Latzel's diagnosis of Craspedosoma. Corpus subleres et plus 

 tninusve iuliforme. Segmenta carinis evanescentibus aut nullis, tuberculis vel gramdis 

 senis setigeris majorilms vel minoribus ornata et sulco medio, longitudinali exarata. 

 Oculi plerumque distincti. Antenna longcu et tenues, articulo teriio maximo. Pedum 

 pariafemincv (plerumque) 50, maris 48; pedes longi. Mas: Pedum paria duo in or- 

 gana copulativa commutata. 



