354 



PSYCHE. 



[November 1S92 



consider them a distinct species, since they 

 were of uniform size among themselves. 

 Only one specimen of this smaller kind had 

 been found before this date, but it was taken, 

 May 30, on an isolated plant of T. angusti- 

 folia, alone and solitary. 1 will therefore 

 not attempt to prove any distinction between 

 th&two forms, which may be only the two 

 sexes of the same species, and apparently are 

 from an examination of the genitalia. 



The punctures are sometimes placed in 

 rows, but usually only when near the tips of 

 the narrow leaves of T. angustifolia. They 

 are most often massed together over the 

 whole upper distal surface of the leaf, and 

 are always placed very closely together. 

 Each patch or tuft of the cottony substance 

 which marks a puncture is usually from f mm. 

 to 1 mm. in diameter, and about f mm. thick 

 or slightly more. 



This white, fluffy material is extremely 



fine in texture, and I was at first inclined to 

 believe that it was simply the natural very 

 fine and silken fiber of the Yucca leaf, carded 

 out by the ovipositor of the female Oecleus. 

 Were this so, it would be quite interesting as 

 exhibiting in a state of nature the beautiful, 

 delicate, silken fiber which these plants are 

 capable of yielding. I believe, however, 

 that it is a juice, either from the leaf or from 

 the insect, probably the former, which 

 hardens on exposure to the air. It is seem- 

 ingly soluble in water, and is probably only 

 the hardened sap of the Yucca leaf. 



In conclusion, it might be said that the 

 constant watchfulness with which the Oecleus 

 seems to attend upon and frequent the vicin- 

 ity of its egg-punctures, even after the eggs 

 have for days been deposited, is suggestive 

 of a motherly instinct and seems a manifes- 

 tation of parental care in the hatching of the 

 young. 



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