92 NEW YORK STATE MUSEUM 



of the mother larva in the region of the fifth body segment, a con- 

 dition presaging the nearly developed embryo. The next day the 

 ocular spot was black. Observations were continued daily from 

 January ist to the 13th, during which time development appeared 

 to be slow and a clear definition of the changes undergone almost 

 impossible because of the condition of the cell. January i6th the 

 embryos had escaped. 



The moderate sized, yellowish or whitish larva mentioned above 

 was lost sight of for a time, not being located till December 23, 

 1910, at which time it was found well established on the underside of 

 a splinter of wood and with a length of about 3 mm. It remained 

 moderately active for a time, two embryos being observed the 26th, 

 at which time its color approximated closely that of the wood and 

 accounted in large measure for its being overlooked earlier. The 

 28th the adipose tissue of the mother larva had nearly disappeared 

 and on the 31st an ocular spot was visible in the young. January 

 1st the head and ocular spot of two embryos were recognized, and 

 on the 5th embryonic movements were observed. The next day 

 one embryo had extruded its head through the skin of the mother 

 larva. Our records show that embryos remained within this 

 mother larva till the 20th, possibly one or more perishing. 



There were at least three small, yellowish larvae placed in this 

 preparation with the two larger ones discussed above. These re- 

 mained active for some days, two being located as quiescent, each 

 containing an embryo about half the length of the mother larva, 

 December 23, 1910, and from this on were subjected to daily ob- 

 servation. The first of these showed a grouping of the cells in 

 TOWS the 24th, which became more distinct the next day, and 

 on the 26th a median tract of darker cells was observable. The 

 .28th the embryo extended from the second to the eleventh body 

 segments of the mother larva and showed rather distinct masses 

 of adipose and mesodermal tissue (pi. 35, fig. 3). The ocular spot 

 was evident and the head slightly fuscous. On the 30th movements 

 of the anterior extremity of the embryo and streaming of the body 

 contents were observed, the mesodermal tissue was less conspicuous 

 and the adipose tissue occupied more space. The embryo escaped 

 from the mother larva January ist. This was unusually early and 

 may have been hastened by artificial causes. 



The second small, yellowish, quiescent larva was located De- 

 cember 23, 1910 at which time it contained a large-celled embryo 

 with a length fully one-half that of the mother larva. Three days 



