DIPNEUMONES. 653 



ing or prostrate timber, like those of the same genus, moves 

 side wise and backwards, but it is much more active than T. 

 celer. When pursued by an enemy, like Attus and Epei'ra, it 

 leaps and hangs by a thread, which supports it in the air." 

 It is a widely diffused species. T. celer Hentz is also a widely 

 distributed species, and is "found usually on blossoms, where 

 it remains patiently waiting for Diptera, other small insects, 

 and even butterflies, which it secures with amazing muscular 

 power." 



The three remaining genera belong to Latreille's group of 

 "Wanderers," as they spin no web. The species of Dolomedes 



Fig. 631. 



(Fig. 631, from Harris' Correspondence) wander after their 

 prey, making no web, except while rearing their young, and 

 hiding under stones, sometimes diving under water ; the cocoon 

 is usually orbicular, and is carried by the mother. D. lanceo- 

 latus Hentz "is always found near or on water, running on it 

 with surprising agility, preying often on large aquatic insects. 

 A female of Dolomedes was twice found on high bushes by my 

 friend, T. W. Harris, in Milton, Mass., 'on a large, irregular 



