110 ENTOMOLOGICAL NEWS. [May, 



present in Calliphora vomitoria and erythrocephala. Two mar- 

 ginal scutellar macrochsetae are normally present in Calliphora 

 and some related genera. Two discal scutellar are occasionally 

 seen (as an abnormality) in Calliphora and many other Muscidae 

 (sens, strict.) 



Two individuals, out of the 244, presented both absence of 

 normal and presence of abnormal macrochaetse. These were : 



A female with a third pair of anterior achrosticals whose second 

 left posterior achrostical was absent. She had, however, a very 

 small achrostical on the left side in the position occupied by the 

 third posterior achrostical when that is present. 



In one male the left apical scutellar was absent. The left mar- 

 ginal did not have its usual direction, but that of the absent apical. 

 There were three left and two right discal scutellar instead of the 

 normal one left and one right. One of the left was much the 

 largest and seemed, like the marginal, to be trying by its direc- 

 tion to make up for the absent apical. This was the only specimen 

 in which any macrochaeta had other than its normal direction. 



Omitting this monstrosity from further consideration I would 

 submit the following conclusions : 



1. In Cynomyia americana there is very little variation in the 

 size or number of the macrochaetae of the thorax and scutellum. 



2. Variations in size affect only the third anterior dorso-central. 



3. It is very rare for any macrochaeta normally present to be 

 absent, except the third anterior dorso-central and the second 

 posterior achrostical. 



4. When a macrochaeta, normally absent, is present we find 

 that it is, in eleven individuals out of twenty-two, one that is 

 normally present in all the typical species of Calliphora; that in 

 six other individuals it is one which is normally present in one 

 species of Calliphora and occurs occasionally in others; that in 

 the other five individuals it is an abnormality, which is also found 

 in various species of Calliphora. 



5. The presence in three females of an anterior intra-alar is of 

 especial interest, because it is present in all my specimens of 

 Cyn. elongata (although in them rather a small macrochaeta) and 

 because it is always present, as far as my knowledge extends, in 

 Calliphora and the genera closely related thereto. 



6. The females of Cyn. elongata have, like all the typical Cal- 

 liphorae, three posterior achrosticals. 



