264 Annals Entomological Society of America [Vol. VI^ 



The female of L. sericata (3, 2, 1, 3.) taken at the garbage 

 scow, Boston, August 8, gave as above recorded 10 cf cf-3, 3, 3, 3, 

 and 12 9 9-3, 3, 3, 3. Three pairs of these were segregated 

 and gave offspring as follows: 



Of the progeny of the first pair 1 cf-3, 3, 3, 3, was mated 

 to 2 9 9-3, 3, 3, 3, and produced offspring as follows: 

 163 0^0^—3,3,3,3. 170 9 9—3,3,3,3. 



Of the progeny of the second pair 1 cf-3, 3, 3, 3, was mated 

 to 1 9-3, 3, 3, 3, and produced the following: 



92 0^6^—3,3,3,3. 85 9 9—3,3,3,3. 



2 0^0^-3, a! be, a ! be, 3. 5 0^0^-3, a ! be, 3, 3. 



4 0^6^-3, 3, a ! be, 3. 3 9 9—3, a ! be, 3, 3. 



1 9 —3, 3, a .' be, 3. 1 9 —3, ac, 3, 3. 



If we take the totals of this inbred stock we find them as 

 follows : 



362 cfd'— 3, 3, 3, 3. 363 9 9—3, 3, 3, 3. 



By reduction, 18 d'cf and 18 9 9 or 5%. 

 By addition, 16 cT'cT and 11 9 9 or 3.7%. 



In the spring of 1912 a few specimens of Calliphora vomi- 

 toria L. and C. viridescens Desv. were taken at Cambridge 

 and C. erythrocephala Meig was common all through the sum- 

 mer. In the fall vomitoria and viridescens appeared in consider- 

 able numbers in the vicinity of the Bussey Institution. The 



