76 MR. NEWPORT ON THE ANATOMY AND DEVELOPMENT 



will soon enter the earth, which it does, as I presume must have been the case with these 

 insects, while the parasites are very young and small, otherwise they may be injured or 

 detached while the caterpillar is burrowing and making its cell. The fated insect, ex- 

 hausted by the parasites, has but sufficient strength to complete and tapestry its earthen 

 chamber before it dies, leaving its newly -formed abode to the occupation of its enemies, 

 which grow rapidly, as we have- seen, pass through the changes I have traced, and then 

 form their own cocoon in which they are metamorphosed to nymphs. 



On examining one or two of the cylinders at the time of obtaining them in the begin- 

 ning of April, I found that the inmates had very recently changed to nymphs (fig. 18). 



On the 8th of May one of these assumed the imago state (fig. 19), but escaped on my 

 incautiously opening the box that inclosed them. On the 14-th two more appeared, and I 

 now had the means of identifying the species. It proved to be as I have stated, Pcmiscm 

 virgatus. 



It is probable that these insects may have come forth at a period earlier than in their 

 natural haunts, having been kept in a warm room, and the temperature of the season, at 

 the time of their evolution, being considerably higher than usual. It is worthy of remark, 

 however, that the moth, or the larva of which this Paniseus is a parasite, kept during its 

 pupa state under precisely similar circumstances, had already made its appearance a week 

 at least previously; so that, under similar conditions of locality and temperature, the 

 parasites came forth at the latest period. 



