594 EDWARD M. NELSON ON VARIOUS INSECT STRUCTURES. 



insects hairs, a careful examination of the small hairs upon the 

 wing of a wasp will show that they are twisted like the tusk of 

 a narwhal (fig. 6). 



The hairs on a bee's wing are somewhat similar, but not so 

 much twisted, while they have no ring. Those on the wing of 

 a saw-fly (Tenthredo) issue from a boss. The hairs on the 

 ovipositor of Phalangia are more interesting. This ovipositor 

 has some thirty or forty white and brown transverse stripes ; 

 the hairs upon it are of the ordinary kind with a ringed base, 



7*/. 



4- 



except those upon the two last terminal stripes, where the hairs 

 are larger and the ringed base is ornamented with a circle of 

 very minute hairs ; the hair itself is tubular and has a fila- 

 mentous end. At the side of these hairs there is a sort of minute 

 prong, which might be thought a hook, but is, I think, a cut or 

 opening in the side of the hair (fig. 4, termination of hair not 

 drawn). At the end of each of the two lobes of the ovipositor 

 is a small boss covered with small hairs. These hairs have no 

 ring bases and are blunt-ended, probably open at the top ; but 

 they have internal ring (not spiral) structure somewhat like an 



