THE MYllIAPODA OF NORTH .AMERICA. 159 



Family IV. CALLIPODIDJS. 

 Includes the genus CallijniK of Rlsso. 



Suborder II. POLYDESMOIDEA. 



Contains the following families: 



a. Pleural and ventral plaies, except those of the two anterior segments, not free; 

 segment- lit or -''I; pairs of legs ( $ ) 28 or ( j 29, or ( <J) 30 or ( 9 ) :-!!. 



I'0[.Y1>I>M1I> 1 . V. 



MI. Pleural and ventral plates free ; segments 21; pairs of legs 32; shape of body 

 as iu the (Momeridu' GLOMERIDESMUXE.* \"1. 



Family V. POLYDESMIDJO. 



This family is divisible into two subfamilies: 



a. Body elongate, contractile into a spire; lateral carina' never strongly depressed. 



I'oi.Yi)i>Mi\.i:. XV. 

 na. Body short, very convex, contractile into a hall; carina' strongly depressed. 



SPH.EKIoDKS.MIX.Ii. XVI. 



Subfamily XV. POLYDESMIX^E. 



J wr/ ///>'<* of the i/i-in'rit. 



a. Repugnatorial pores placed on tin- .">, 7. M. 10, 12, 13, 15-19 segments. 

 h. Femora of legs not spined. 

 c. A swelling around the repugnntorial pore. 

 d. Anal segment more or less sharji. 



e. Dorsal plates with a longitudinal sulens, smooth; lateral earina- small; 



body narrow. 



/. Body strongly jnlid; lateral eaduir rudimentary or line-like; anal seg- 

 ment decurved. .STRONGYLOSOMA Braiui . 

 J'f. Body less jnlid; lateral earina- very plain; anal segnn-nl \\ilh the ci d 



excised < >I:THO.M< nti-ii A t I Soil man. 



ee. Dorsal plates not distinctly snlcnii-; smooth or sealy : lateral eariu;e 



large : liody \\ idr. 

 g. Back convex. 



/(. Dorsal plates smooth; lateral carina- no! sm-ate. 



Li:ri om>Mrs Sanssure. 



/i/(. Dorsal ]>lates rough: lateral earina- very large and the margins 



serrate. 



Onn.vroTKtii'is Hnmh. and San>-.. 

 gy. Back Hat. 



/. h'epugnatorial pores placed on the upper part of lateral carina'. 



KIIAI i> Saiissmc. 



ii. K'epngnatorial pore placed on the lateral margin of carina-. 

 /.'. Jv'epnuiiatoiial pore surrounded liy a round swelling. 



/. Segmeiils \\ ii h a fr\\ i ml is| i ncl I ii hercles along t he ma ru i us 

 (species white) < 'II II \~-IM-. I loll man. 



* If (Jer\ ai- '- siatements and Inures of Ii /ititit rii'i .1 ////-. /;"/T< ///l.^ are 1 1 m- il should 

 represent the type of a new family. It combines a few ehaia^ i. i- of tin.- J'uli/- 1 

 i//iii'r and 1 1 In/in riil'i , under the latter of whieh (M-rvais jdai-ed it. 



\Oi-tlioiiKii-jihd Bollma.n lor I'urcd M/U.S Sanssure. whieh is ]>] in ( ii]iied. 



^ A- o.ri/iu-in Kocli i-, pivn. cupied, Leptod 'ussure must l>e n->ed in--lead. 



