648 ARANEINA. 



one pair is very small, while there are eight ocelli. The differ, 

 ent species make cylindrical holes in the earth ; that of M. 

 nidulans of the West Indies is closed by a lid of earth covered 

 beneath with silk. Mygale avicularia Linn., the Bird spider, 

 seizes small birds and sncks their blood. M. Hentzii (Fig. 

 627, natural size) ranges from Missouri southward. 



DiPNEUMONES Latreille. In the remaining genera of spiders 

 there are two lung-sacs, two or four stigmata, and three pairs 



Fig. 627. 



of spinnerets. They are divided into two groups, the "Sed- 

 entary" and "Wandering" spiders. The sedentary species 

 have the ocelli usually arranged in two transverse rows ; they 

 spin webs in which they remain and seize their prey. In the 



