158 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



On October 14, 1911, two caterpillars of Apatela were taken 

 under bands and put in vials. One of these was healthy and pu- 

 pated later. Concerning the other, which it later developed was 

 parasitized by Sphceropyx, my notes are as follows: "The parasite 

 larvae emerged from the host this morning. They issued from vari- 

 ous points along the back and sides of the host, appearing at first 

 as whitish papillae, and gradually forced themselves through open- 

 ings of smaller diameter than their bodies. When first emerged 

 they were about three-sixteenths of an inch long, but within a few 

 hours they nearly doubled in size, simply engorging on the fluids 

 of the host." 



Another caterpillar taken with others on July 23, 1912, turned 

 out to have been parasitized, when three days later on July 26, 

 about twenty-five of the large pinkish larvae of Sph&ropyx were 

 found to have issued from it. These had reached full size when 

 the fact of parasitism was discovered. Seven were placed in cells 

 between slips of transparent celluloid for observation on the fur- 

 ther development. The cocoons had been spun by the next morn- 

 ing. On August 1 the following notes were made: "As the pupa 

 develops within the larval skin the pink color becomes concen- 

 trated in the abdominal region, becoming especially evident as 

 a red streak along the median line where there are no fat bodies 

 to obscure the color. This morning, the insect being in what may 

 be termed the prepupal condition, this coloring matter has been 

 discharged as a wine colored liquid and the insects are opaque white. 

 As the prepupal condition is assumed there is a considerable, 

 gradual shortening of the body." On August 8 five of the para- 

 sites pupated. The other two died without pupating. By Au- 

 gust 10 the pupae had begun to assume the adult colors, the head and 

 thorax having become black, and on August 12 the abdomen had 

 become red. On August 13 three had transformed to the imago 

 and on August 14 the other two had done likewise. The first three 

 to transform emerged on August 15 and the others on August 16. 

 That the development was not influenced by the method of han- 

 dling was shown by the fact that adults were reared from other 

 larvae on the same host at the same time as from those in the 

 transparent cells. 



The development from the time the larva emerged from the 

 host to the date of the issuance of the imagoes was as follows : from 

 emergence to spinning of cocoon 1 day, from cocoon to pupation 

 Q l /2 days, pupal period 10J/2 to 11^ days, period from transforma- 

 tion to emergence 2 days, period in cocoon 19 to 20 days, and 

 total period from emergence of larva from host to issuance of adult 

 20 to 21 days. 



All of the specimens reared from the above lot were males. From 

 a number of hosts only females were reared, but from a majority 



