THE MYRIAPODA OP NORTH AMERICA. 139 



11. Spirostreptus. 



1833. — Spirostreptus Brandt. Bull. Soc. ini]>. Nat. Moscou, 203 (sebae and audouini). 



1833. — 8pirocycli8tv8 Brandt. Bull. Soc. imp. Nat. Moscou, 204 (acutangulus). 



1833. — Spiropajus Brandt. Bull. Soc. imp. Nat. Moscou, 201 (fischeri). 



1841. — Nodopyge Brandt. Recueil 91 (javanicus, sebae, audouini, etc). 



1841. — Odontopyge Brandt. Recueil, 110 (Mcii8pidatu8,flavotasniatus, gracilicornis, etc.). 



Brandt in his subdivision of Spirostreptus did not retain the original 

 name of the genus for that division of it which contained the original 

 type of the genus. Now, as Wodopyge contains the type of Spirostreptus, 

 the name Spirostreptus must be used in place of Nodopyge. Spiropaeus is 

 also identical with Spirosteptus, and as its types belong to his subgenus 

 Odontopyge, it must be used in place of Odontopyge on account of its 

 priority. 



12. PjEROMOPUS. 



1881. — Pasromopu8 Karsch. Einigo neue dip. Myr. Ber. Mas., 12 (lysiopetalinus = Spiro- 

 bolttx angusticejw Wood). 



This genus has been considered by Latzel as identical withJulus, but 

 the following from Dr. Karsch's generic description has led me to be 

 lieve that it should be recognized as a valid genus : 



li Ocellis oealorum seriebus utrinque 3 tantum transversis compositis 

 . . . antennis pedibusque longissimis . . . colo in mare appendi- 

 cibus erassis haud pediformibus sat longis instrueto .... metatar- 

 si* pedum pel ma munitis" 



None of the species of Julus ever attain a length of over 100 millime- 

 ters, while those of Pceromopus are from 150 to 105 millimeters long. 



So far the mouth parts and gnathochilariuni. vhich always present 

 the best generic characters, have not been examined. 



13. Trachyjulus. 



1864. — Trachyjulus Peters Mouatsber. Kim. preuss. Akad. Wiss., 547 (ceylonicus). 

 1884. — Trachyiulw Latzel. Myr. Ost.-Ungar. Mon., 11, 56 (emend.). 



This genus is closely related to Acanthiulus, but is easily separated 

 by the following characters: Ocelli in a single series. Antennae and 

 legs moderately long. Posterior border of first segment carinated, 

 sides not produced as in Acanthiulus. Other segments, except the last, 

 with 13 to 21 rows of carinse. 



First, second, and third segments each with one pair of legs, fourth, 

 footless. Peters' orthography Trachyjulus ought to be used instead of 

 Traehyiulus, which emendation has been used by later authors. The 

 same must be the rule with Acanthiulus and Qlyphiulus. 



14. Acanthiulus. 



1847. — Acanthiulus Gervais. Ann. Sci. Nat., 70 (blainvillii). 



This genus was first recognized by Gervais as a subgenus of Julu.s, 

 but as it bears no relation to Julus it has been raised by later authors 

 to a generic rank. 



