DIPLOPODA 



467 



Pauropus Lubbock. With the characters above given: 2 species, 

 1 American. 



P. huxleyi Lub. (P. lubbocki Packard) (Fig. 

 724). Terminal knob of antenna sessile or nearly 

 so; length 1.3 mm.; width .35 mm.: Europe and 

 eastern and central United States. 



Family 2. EURYPAUROPODIDAE. 



Segmentation indistinct; 9 pairs of legs pres- 

 ent; body very wide and flat, 

 and tuberculate and spinose 

 dorsally, with the head and the 

 short legs concealed under it; 

 color reddish ; antennal knob on 

 a long stalk: 1 genus and 3 

 species, 1 American. 



EuRYPAUROPUS Ryder. 

 With the characters above 

 given. 



E. spinosus Ryder (Fig. 725). Length 1.25 mm.; 



Fig. 725 width .5 mm.: eastern and central United States; 



Eupauropus spinosus t-i 



(Kenyon). Europe. 



Fig. 724 — Pauropus 

 huxleyi (Kenyon). 



Suborder 3. DIPLOPODA. ( Chilognatha. ) 



The millipeds (Fig. 726). Usually elongate and cylindrical myria- 

 pods with 2 pairs of legs on most of the segments; with the exception 

 of the first few and the last segments, each 

 has been formed by the fusion of 2 somites, 

 thus possessing 4 legs, 2 ganglia, 2 pairs of 

 spiracles, and 2 pairs of openings in the 

 heart ; antennae short, mostly 7-jointed ; but 

 one pair of maxillae present, which are 

 united to form an underlip called the gna- 

 thochilarium ; an upper lip present in front 

 of the mouth; integument often hard, con- 

 taining calcium carbonate ; legs of each pair 

 spring from the ventral surface close to- 

 gether and near each leg is a spiracle ; a row 

 of the openings of stink glands usually pres- 

 ent along the side of the body, which secrete an offensive gas, which in 

 certain cases is hydrocyanic acid ; tracheae of primitive structure, each 

 spiracle opening into a bunch of usually unbranched tubes ; gonads usu- 



Fig. 726 — Diagram of the 

 front end of a diplopod {Poly- 

 dcsmus) (Latzel). 1, female 

 genital pore ; 2, intestine ; .3, 

 dorsal plate. 



