Part 19

Singa pratensis, 186. variabilis, 187.

Spinnerets, x.

Spintharus flavidus, 127.

Spiral threads of cobwebs, 155-159.

Steatoda borealis, 119. corollata, 121. guttata, 120. marmorata, 120. triangulosa, 121.

Stemonyphantes, see Linyphia trilineata, 143.

Sternum, x.

Synemosyna, 64.

Tarantula, see Lycosa carolinensis, 73, 74.

Tarsus, viii.

Tegenaria, 96-103. complicata, 102. derhamii, 96-98. longitarsus, 102, 104. medicinalis, 99.

Tetragnatha, 198-204. extensa, 201. grallator, 200. laboriosa, 202. straminea, 204.

Thanatus coloradensis, 39, 40. lycosoides, 39, 40.

Therididæ, 107.

Theridium, 110. differens, 114. frondeum, 116, 117. globosum, 113. murarium, 115. rupicola, 113. spirale, 116. tepidariorum, 111, 112. unimaculatum, 118. verecundum = Latrodectus mactans, 122.

Theridula sphærula, 127, 128.

Thomisidæ, 24.

Thorax, viii.

Tibellus duttonii, 39.

Tibia, viii.

Titanæca, see Amaurobius americana, 215.

Tmarus caudatus, 38.

Tracheæ, x.

Trachelas ruber, 19, 20.

Trochanter, viii.

Uloborus plumipes, 216, 217.

Winter habits of spiders, xv.

Xysticus, 30. gulosus, 31. limbatus, 31. nervosus, 32. quadrilineatus, 33. stomachosus, 30. triguttatus, 33. versicolor, 34.