REPORT OF THE STATE ENTOMOLOGIST I9IO Id 



eighth to the twelfth embryonic segments, extending a httle over 

 half the width of the embryo. Posteriorly there were several 

 large, globose, nucleated cells, presumably polar cells, while at the 

 opposite end there was a considerable mass of large cells having 

 a diameter of one-fourth to one-third that of the embryo. Two 

 days later the posterior extremity of the embryO' contained a mass 

 of large-celled tissue in which were several larger, indistinct, pre- 

 sumably polar cells. The large, glistening mesodermal tissue was 

 observed in the region of the ninth to the twelfth segments, while 

 the sublateral developing adipose tissue was seen on either side. 

 This condition is well shown in a photograph taken the following 

 day (pi. 35, fig. 2), at which time the embryo exhibited distinct 

 movements. The rather well formed head was colorless and moved 

 from side to side. Streaming of the body contents was observed 

 though the fat bodies occupied a comparatively small space on 

 either side. The fine-celled, slender, malpighian tubes were noted. 

 The posterior extremity had well developed lobes. On the 25th 

 the median mass of mesodermal tissue had begun to contract, the 

 developing adipose tissue increasing considerably. Two days later 

 the head was well developed; the ocular spot black; the salivary 

 glands were recognized; the malpighian tubes were distinct, while 

 the mesodermal tissue extended approximately from the tenth to 

 the twelfth segments and had a width only about one-fourth the 

 diameter of the embryo. The following day the embryo escaped 

 from the mother larva. 



Larva N was a small, yellow larva separated January 30th and 

 containing an embryo extending from the posterior third of the 

 ninth to the posterior third of the eleventh segment of the mother 

 larva. The embryo exhibited a distinct germinal strip extending 

 from the anterior third to the posterior fourth and with a broad 

 band of ectodermal tissue extending to one side and including ap- 

 proximately the middle of the embryo. The anterior extremity of 

 the embryo is capped as it were with dark-celled tissue, while large 

 yolk cells may be seen here and there in the germ plasma. This 

 embryo was about as far advanced as the one illustrated on plate 32, 

 figure 4. The next day there was a median germinal strip of lighter 

 cells and on one side a layer of decidedly darker cells, much as 

 shown in plate 30, figure i. February ist the two layers described 

 above were more distinct and broader, the median lighter one being 

 crowded a little to one side by the greater development and conse- 

 quent breadth of the darker ectoderm, which latter extended al- 



