472 



MYEIAPODA 



Fig. 731 

 Polydesmus 

 moniliaris 



(Wood). 



P. moniliaris Koch (P. serratus Wood) (Fig. 731). Body deep 

 brown, about 20 mm. long; each dorsal plate with 3 rows of rectangular 

 tubercles; terminal spine of male copulatory leg double: eastern states. 



2. SCYTONOTUS Koch. Each segment with 4 or 5 rows 

 of tubercles; each stink pore surrounded by a round 

 swelling: 3 American species. 



S. granulatus (Say). Body brown, about 12 mm. 

 long; lateral plates not large: eastern and central states; 

 common. 



3. LEPTODESMUS Saussure. Dorsal plates without 

 tubercles and more or less convex, the body being rather 

 narrow: 8 American species. 



L. hispidipes (Wood). Color dark olive brown, some- 

 times with yellowish spots and a mid-dorsal black line; 

 legs roughened, with closely set, stiff hairs; genital ap- 

 pendages of male short and thick, with a curved, hairy 

 terminal spine: central states, being abundant towards 

 the south. 



4. ETTRYTJRUS Koch. Dorsal plates smooth or with indistinct tuber- 

 cles; anal segment quadrate and not sharp behind: 2 American species. 



E. erythropygus Brandt (Fig. 732). Body 28 mm. long and 3.5 

 mm. wide, olive chestnut in color, with a median and a pair of lateral 

 orange spots on each segment; terminal spine of 



male copulatory appendage curved, and forked at 

 the end: common in the central states. 



5. FONTARIA Gray. Basal portion of the legs 

 with spines; dorsal plates convex, with large lateral 

 plates: 20 American species. 



F. virginiensis (Drury) (Fig. 733). Body chest- 

 nut in color with lateral plates of yellow; lateral 

 plates rounded in front, acute behind; terminal 

 spine of male copulatory appendage curved and 

 forked at the end and with a bristle springing from 

 it: common in the central states. 



F. coriacea Koch. Body dark chestnut with a yellowish border on 

 each side; lateral plates very broad; terminal spine of male copulatory 

 appendage large and with a corkscrew twist: often common in the 

 central states. 



FAMILY 6. POLYXENIDAE. 



Body minute, short, broad, with a soft integument, and a bunch of 

 hairs on each side segment; the mandibles are entirely within the mouth 



Fig. 732 Fig. 733 



Fig. 732 Euryurus 

 erythropygus 



(Wood). 



Fig. 733 Fontwria 



virginiensis 



(Wood). 



