266 



Annals Entomological Society of America [Vol. VI, 



In the course of collecting Calliphorse four specimens were 

 obtained which I was unable to classify as belonging to any one 

 of the three species common in Massachusetts. They appeared 

 like inter-grades between erythrocephala and viridescens . 



One small sized male had the beard black, the right cheek 

 dark red, and the left cheek somewhat lighter in color. The 

 right cheek was dark enough to place the specimen as viridescens 

 but the left cheek resembled that of erythrocephala. One small 

 and two large sized females answer also to the same description. 

 In all four cases the right cheek is considerably darker then the 

 left. The flies were examined by Mr. C. W. Johnson who was 

 unable to classify them. 



The meaning of these forms is uncertain and I should not 

 feel justified in advancing an hypothesis without first performing 

 breeding experiments with them. 



SUMMARY AND CONCLUSIONS. 



A number of meat flies of the Calliphorine genera, Lucilia 

 and Calliphora, were collected during the summer and fall of 

 1912 and observations were made on the range of variation in 

 the chaetotaxy. The bristles studied were the post-sutural 

 achrosticals and dorso-centrals of the thorax. Breeding ex- 

 periments were also performed in order to study the range 

 of variation in the individual families. 



Especial attention was given to Lucilia sericata. The 

 following table gives the general results of the work on this 

 species. 



