242 BANKS. 



receptacle, so that it need not come frequently to the surface. As the 

 Worcesteria larva seldom goes below the surface region, it must catch 

 the Besvoidya larva when it rises, and this act it performs very skilfully, 

 quickly darting its head around in an arc of a circle, using its respiratory 

 siphon as a pivot or center. The Desvoidya lai-va once captured, makes 

 very few struggles, as if realizing that it is helpless against its stronger 

 foe. 



The larviE of this species are always very fat in the latter period of 

 their growth, and from this fact I strongly suspect them to be canni- 

 balistic, the larger preying upon the smaller, although I have never had 

 ocular demonstration of this. One seldom or never finds larvse of as- 

 sorted sizes in the same receptacle and this would be somewhat of a proof 

 that the smaller are not allowed to live with their larger fellows. 



It might be suggested that the equality of size in these larvae could be 

 explained by the fact that all the eggs are laid at a given time, but the 

 adults have been seen depositing their eggs on different days in the 

 same cvrp. 



Pupa : Length over the dorsum, 8 millimeters ; of a rather light brown until 

 a day or so before the adult emerges, when it turns black and white, the adult 

 colors showing through the pupal skin. 



Both the first and second abdominal seg-ments bear a pair of dorsal plumose 

 sette, those on the first being very much larger than the other pair. 



The respiratory siphons are cornucopia-shaped, the anterior portion of the lip 

 being truncate. 



The pinnurfe are irregularly oval, being broadest at the distal extremity, and 

 retuse at the point where the vein meets the margin. The cilia are quite long 

 and extend around the entire distal portion from the middle of each lateral margin. 

 The surface is finely reticulate and slightly pilose. 



The urochaetse are one-fifth the length of the pinnurae and are straight except 

 at their bases, where they are sharply curved. (PI. IV, fig. 4.) 



The seventh abdominal segment bears at its posterior lateral angle a 4-part*d 

 pectinate spine, while the eighth has a similar longer one of ten branches. 



The pupte are verj' lethargic in their movements, remaining grouped 

 together at one side of the containing vessel. The pupal stage lasts for 

 three to four days. 



Adult: The adult specimens reared by me conform in every respect to the 

 description given by Ludlow.'' 



These insects fly in a very leisurely manner and with the hind legs 

 curved upward over the back, the fore and mid legs spread out con- 

 siderably from the body on each side and the tarei recurved. The note 

 made by their wings is very low, due to the slow vibration. 



In the early morning, about dayljreak, and in the early evening, they 



* Can. Ent. (1904), 36, 230. 



