ZOOLOGY. ARTHROPODA. 165 



especially of the posterior ones, deeply suffused with fulvous. 



Lestes unguioulata Hagen. 



By putting together the pieces of a disintegrated specimen, 

 it has been possible to identify this very interesting little 

 species. It proves to be a female, of the fully developed type 

 of coloration, and differs in no respect from the well matured 

 adults which are common in New Jersey and Maryland. 



The foregoing are both freshwater types of the order, and 

 must have passed through their young stages in places where 

 suitable food could be procured. This goes to show that ponds 

 or swamps of fresh or mildly brackish water must exist in the 

 vicinity of the places from which these specimens were taken. 

 Neither of them belongs to the strong-winged and widely rov- 

 ing Odonata, which fly without hesitation across hundreds of 

 miles of open ocean. Possibly the progenitors of these species 

 might have been wafted by high winds across the six hun- 

 dred miles of oceanic surface between the coast of Carolina 

 and the Bermuda Islands. We know that strong winds, blow- 

 ing off the mainland of Maryland and Virginia, carry count- 

 less numbers of nearly all kinds of insects out over the ocean, 

 and that many of these being dropped into the waves are re- 

 turned to the shores by the tides and piled up in windrows 

 along the beaches. Among these we have often found the 

 lialf drowned dragon-flies mixed in with the thick piles of 

 beetles, bugs, wasps, and flies which stretched along the line of 

 the retreating tide. 



This suggests the fact that either the tadpoles of frogs, or 

 the larvEB of other insects, must be present in the standing 

 water of these islands, to afford food to the voracious larvse 

 and nymphs of these dragon-flies. 



It is extremely improbable that these are the only kinds of 

 Odonata inhabiting the Bermudas. The swift-winged ^schnas, 

 and some of the large and strong species of Tramea and 

 Libellula have been seen on ships at a greater distance from 

 the mainland than the position of these islands. We should 



