106 PUTNAM, NOTES ON THE 



pressing of the sticky particles to the walls. In a short 

 time the opening made was closed over by a very thin 

 silken web. The cells, measured on the inside of the hard 

 walls, were .35 of an inch in' length and .15 in diameter. 

 The natural attitude of the larva is somewhat curved 

 in its cell, but if straightened, it just equals the inside 

 length of the cell. 



On the 31st of July two female bees came out, having 

 cut their way through the sides of their cells. Five other 

 cells were opened, in the hope of finding a pupa, but with- 

 out success ; two of them containing larva?, and three, 

 dead bees fully formed. In these last mentioned cells, 

 several hundred minute Ichneumons were seen, which 

 came forth as soon as the cells were opened. 



August 4. Three more bees came out. One was a 

 male, and differed Irom the female by not having a sting- 

 by its blunt abdomen ; by the hairs on the under side 

 being fewer and shorter and not of so deep a red color, 

 and by being very hairy about the underside of the head. 



August 5, and 6. A female came out each day, after 

 which no more appeared, the rest of the cells having prob- 

 ably been ichneumoned, as upon being opened in October, 

 by Mr. Packard, Ichneumons were found in nearly all. 

 Most of these parasites being then in the larval or pupal 

 stages, Avere probably not developed until the spring. 

 Are there two broods of Ichneumons in one year, or are 

 those that came out on the last of July of a different 

 species?* 



July 3. A female Megachile was discovered making a 

 cell of pieces of leaf in a small hole in the ground. The 

 hole was about two inches in depth and the cell was just 

 commenced, as there were but four quite fresh pieces in 

 it, which appeared to have been cut from locust leaves. 

 This was of the same species as the one that built her 

 cells on the piazza, and which has been identified by Mr. 

 Packard as 31. centuncularis. 



Another species was also seen cutting pieces from the 

 rose leaves, but its cells could not be discovered. This 



* For further observations on these parasites, see Mr. Packard's remarks 

 in the following article. 



