154 BULLETIN 46, UNITED STATES NATIONAL MUSEUM. 



Superorder I. CHILOGNATHA. 



This division is divisible into tlie following orders: 



a. Copulatory organs of male formed by a transformation of one or both pairs of 



legs of seventh segment; alimentary tract straight; trachea?, simple. 

 1>. Mandibles and gnathochilarium rudimentary; labrum sinuate; month parts 

 more or less suctatorial ................................ COLOHOGNATHA. I. 



bb. Mandibles and gnathochilarium not rudimentary; labrum tridcntate; mouth 

 parts not suctatorial ............................. HELMINTHOMORPHA. II. 



aa. Copulatory organs of male formed by accessory pairs of legs, situated at the pos- 

 terior part of body ; labrum sinuate or unideutate; alimentary tract bent; 

 trachea? branched ................................... ONISCOMORPHA. III. 



Order I. COLOBOGNATHA. 

 This order contains the following 1 family: 



Family I. POLYZONIID^E. 



Analysis of the subfamilies of 



a. (rnathochilarimn represented by an acute triangular plate; dorsal plates not sul- 



cate; lateral carime not well developed. 



li. P>ody filiform, pilose; ocelli absent; anal scale present; antenna? strongly cla- 

 vate; mouth parts strongly suctatorial .......... Siriioxoi-noRix.E. I. 



bb. Body wide and depressed, not pilose; ocelli present; anal scale absent; anten- 

 na' not strongly clavate; mouth parts less snctatorial. 



P OLYZONIIX.K. II. 



aa. C4nathochilarinm well developed, subsimilar to that of the JnUdir; dorsal plates 



snlcate and covered with numerous short stiff hairs; lateral carina- well 



developed. 

 c. Body filiform; mentnm rectangular; hypostoma not well developed; anal 



scale absent; segments not tubercnlate ........ ANDROGNATHIX.K. III. 



re. Body wide, depressed; mentum hammer-shaped; hypostoma well developed ; 



anal scale present; segments tubercnlate ........ PTATYDKSMIX.K. IV. 



Subfamily I. SIPHONOPHORINJE. 



Includes the genus Siphonophora Brandt, which is distinguished by 

 the characters given for the subfamily. 



Subfamily II. POLYZONIIIO;. 



is of the genera of Polyzoniuui'.' 



a. Anterior margin of first dorsal plate emarginate, not concealing the ocelli. 



OCTOGLENA Wood. 



aa. Anterior margin of first dorsal plate rounded, advanced forward to the base of 

 the antenna?, concealing nearly all the ocelli .......... PoLYZONirMt Brandt. 



tiix Br;inilt. Hull. Sc. Ac-ad. St. Petersb., 183(5. This genus probably 

 belongs to this subfamily. It has two ocelli as in P<>lii?<iiinii. but tlie antenna' are 

 sub-similar in form to that of dcojilnliis. 



t Folyzonlum(Platyulu8 Gervais, = Leiosonm Victor, . 1'efaxt'rjH * Cope. /'iY*- 

 Indrxmns Fan/ago. ~ IHrndi xoma Fan/ago, fI<'.r<//<')Ht McN'eill. I'roc. 1'. S. Nat. 

 Mus., 328, 18X7). 



