1969] 
Shear — Cave Millipeds 
129 
4b. First segment not overlapping the head ; gland openings on flat- 
topped ridges; ocelli usually in a triangular group (Fig. 2) .... 
Order CALLIPODIDA, Family ?, Tetracion. 
5a. Dorsal surface set with rows of small, seta-bearing knobs, 
three to five rows per segment; 20 segments (Figs. 3, 4) 
Family Vanhoeffenidae, 7. 
5b. Dorsal surface of each segment with distinct polygonal areas, 
each with a small seta; or quite smooth; 19 or 20 segments .... 
6. 
6a. Nineteen segments; dorsal surfaces with polygonal areas (Fig. 
5) Family Polydesmidae, Brachydesmus. 
6b. Twenty segments; each segment smooth 
Family Nearctodesmidae, Ectopodesmus. 
7a. Segmental setae in five rows Speorthus. 
7b. Segmental setae in three rows 8. 
8a. Paranota (lateral “wings” on each segment) small, rounded 
(Fig. 3) Antriadesmus. 
8b. Paranota, of each segment prominent, sharply produced back- 
ward 9. 
9a. Last segment triangular, slightly curved ventrad; Nevada .... 
Tidesmus. 
9b. Last segment truncate, not curved (Fig. 4) Texas 
Speodesrnus. 
10a. Head partially concealed by the hoodlike first segment; last 
segment three-lobed; body with 10-12 more or less prominent 
ridges that run the length of each segment (Fig. 12) 
Family Stria riidae, 1 6. 
10b. Head completely exposed ; last segment not lobed ; body with- 
out ridges as described above, though other surface sculpturing 
may be present 1 1. 
1 1 a. Dorsal surface of segments with a heavy pattern of tiny, sharp 
ridges; macrosetae inconspicuous (Fig. 9) 
Family Tingupidae, Tingupa. 
lib. Dorsal surface of segments smooth, except for six seta-bearing 
tubercles, or with rough granulations or knobs, but never sharp, 
tiny ridges (Figs. 8, 10, 13) 12. 
12a. Segmental setae not on prominent knobs, body with nearly 
smooth margins when seen dorsally 1 .... Family Caseyidae, 17* 
12b. Segmental setae on prominent knobs and/or shoulders i3- 
Specimens of the eastern genus Cleldogona will key out here; see notes 
on Cleidogonidae. 
