24 FLIES FOUND IN HOUSES 



Calliphora voinitoria L. Blue-bottle. 



This fly very closely resembles C. erythrocepJiala in size, 

 general shape and colouration. Only the points of difference 

 will therefore be recorded. (PI. Ill, fig. 2.) 



Head. Frontal stripe black with reddish tinge. Jowls black oi- dark grey with red 



hairs. 

 Thorax. Dark blue with very indistinct markings except near the head, where there 



are three lighter patches. 

 Abdoiuen. Dark metallic blue without distinct markings. 



The habits of this species are similar to those of C. erytJiro- 

 cephala, but the fly is not nearly so abundant. Both these flies 

 may be attracted into dark places by odours. 



Both C. erythroccphala and C. voinitoria occasionally deposit 

 their eggs in wounds in living animals, and more rarely in the 

 nostrils (see Chapter xxii). 



According to Howard (1911, p. 254) a smaller species 

 Phonnio tcrrcEuovce Desv. is widespread in the United States, 

 and is occasionally found in houses. 



Lucilia ccesar L. Green-bottle. 



This is a stoutly built fly resembling the blow-fly in general 

 shape, but it is smaller, and its colour is shining metallic green. 

 (PI. IV, fig. I.) 



Length, lo mm. Span of wings 18 mm. 



Head. In i the eyes, which are reddish, nearly meet below the vertex, but in the ? 



are separated by an area equal to one-third of the width of the head. Frontal 



stripe black, frontal margin of eye and cheeks silvery white. Vibrissse large. 



Antennee black ; arista feathered, black. 

 Thorax. Metallic green, without markings, but covered with numerous very short 



black hairs ; long black bristles especially at the sides, and at the posterior end 



of the scutellum. 

 Wings. Clear ; squama opaque and yellowish white. Halteres small and covered 



by squama. 

 Legs. Black ; pulvilli well marked. 

 Abdomen. Metallic green, and covered with small black hairs; many long black 



bristles on terminal segments, especially on their posterior edges. 



This fly, which is the type of a common and widely dis- 

 tributed family characterized by its shining metallic green or 

 blue colour, is not very frequently found in houses. 



