1920] Seamans: Anatomy of Anthomyia 205 



bristles in the female, and ten in the male, the fronto-orbital 

 bristles (fobr). Below the parafrontal plates are narrow regions 

 which follow the orbit posteriorly. These regions are the 

 genae (g) and bear no bristles or spines (Figs. 1, 2, 3, 4), but are 

 sometimes pubescent. 



At the base of the front and just above the base of the 

 antennae, is a triangular opening lunule (1) through which an 

 eversible sac, the ptilinum, protrudes when the insect is emerging 

 from the pupa. From this opening a suture extends down- 

 ward on each side, ending just below the tip of the third joint 

 of the antennas. The eversible sac extends the entire length of 

 the suture. This suture is the frontal suture (fsu) of Lowne, 

 and a slight line of demarkation extends from the tip of the 

 suture to the oral margin. The lower margin of the lunule is 

 formed by the upper margin of the sclerite which bears the 

 antennae. (Fig. 5). The sclerite is cut off from the head 

 capsule by a suture, for the most part concealed by the antennae. 

 This suture, however, follows the vibrissal ridge, below the 

 antennae, and then encircles the oral margin. The sclerite 

 shows distinct regions including the epistome, though no 

 bristles are present, and corresponds closely to the face, as that 

 term is used by Lowne. However, Lowne includes in his term 

 face all the area surrounded by the frontal suture. The area 

 which Lowne considers the facialia or facial edge of the para- 

 cephalon is the region which in this species lies between the face 

 and the frontal suture and bears the oral vibrissas and facial 

 bristles. (Figs. 1, 2, 3 aiid 4). 



Between the genae and facialia is a somewhat flattened, 

 triangular area extending from the oral margin to the eye 

 border. This is the transverse impression or bucca (bu) and 

 in both sexes is devoid of bristles or hairs, but is somewhat 

 pollenous. (Figs. 1, 2, 3 and 4). Bounding the bucca posteriorly 

 and extending towards the occiput and along the oral margin 

 is a distinctly raised or convex region, which is the cheek (c). 

 This is covered with long black hairs and has a row of distinct 

 bristles along the oral margin. (Fig. 1, 2, 3, 4). 



The antennae present no distinct sexual differences. (Fig. G). 

 They are three jointed, the third joint bearing a long, slender, 

 pubescent, three-jointed arista (ar). The first joint of the 

 antenna is the smallest, short, collar-like and slightly com- 

 pressed laterally. There are two bristles on the anterior 



