ELISHA MITCHELL SCIENTIFIC SOCIETY. 29 



bles one of these snail shells by the color and shape of its abdo- 

 men. The two specimens which I collected deceived me at first, 

 but a few threads of silk led me to make an examination. The 

 spider seemed so confident of its protection that it would not 

 move when I jarred the plant, striking it several hard blows. 

 I pulled the spider forcibly from the leaf, and it did not exhibit 

 any signs of movement until transferred to the cyanide bottle. 

 The cocoons which I have found here are also protected by 

 mimicry. They are essentially like those of Cyrtarachne bisac- 

 cata Emert.* They are dark brown, about 12 mm in diameter, 

 and are provided on two opposite sides with stems made of the 

 same colored silk, about 5 mm in diameter. The whole structure, 

 which is hung in the branches of some weed, strongly resembles 

 an insect gall made on the stem of some plant. As the species 

 seems to be new, I append a description. 



Cyrtarachne multilineata, N. Sp. Middle eyes on a slight 

 elevation, forming a trapezium, the posterior a little larger and 

 farther apart than the anterior. Side eyes at a distance, very 

 close to each other, also on a slight elevation. Ceph'x brownish, 

 rising gradually from the low head to the abdomen, which partly 

 covers it, not narrowed behind the eyes, convex on the sides, 

 covered with minute tubercles, the two dorsal elongated promi- 

 nences ending each in two blunt points. Abdomen triangular, 

 sides slightly convex, angles rounded, ventral surface deeply 

 concave. Anterior one-third of abdomen hair brown mottled 

 with the ground color — ecru drab — a pair of large spots of the 

 ground color near the posterior edge of the brown. On the 

 posterior part of the abdomen are several transverse bars of hair 

 brown, becoming successively narrower and shorter toward the 

 apex. Four of the muscular impressions very deep. Sides and 

 posterior part of the abdomen marked with numerous hair brown 

 depressed lines, starting from near the ventral surface, and pars- 

 ing up over the dorsal surface of the edge, four of those on the 

 posterior part passing up nearly to the posterior pair of deep 

 muscular impressions. On the ventral surface there is a rect- 



♦Trans. Conu. Acad. Sci., Vol. VI, 1884, p. 325. 



