i6g 



hypopharynx. They have about twelve serrations 

 at the extremity, coarser than those of the mandi- 

 bles. In some culices, papillae replace the serra- 

 tions. 



The Maxillary Palps. — These lie upon either 

 side and somewhat dorsally to the proboscis. In 

 the act of biting they take no part, but are then 

 separated from and lie at right angles to the pro- 

 boscis. Differences in the palpi are of both 

 specific and generic importance. 



The expanded ends of the palpi in the male 

 Anophelines are even more conspicuous than the 

 plumose antennae. 



The Prothorax. — The main portion of the 

 thorax is mesothoracic ; anteriorly, however, there 

 is a collar-like piece of chitin, the prothorax. To 

 this are attached two moveable bodies, the pata- 

 gia. 



The prothorax is of importance in classifica- 

 tion, e.g., in the new genus of the Anophelinae 

 Stethomyia the prothoracic lobes are mammillated. 



The Mesothorax (Fig. 42). — The scutum of the 

 mesothorax forms the large globular mass of the 

 thorax. Behind the scutum, and just behind the 

 origin of the wings, is a transverse bar of chitin, 

 the scutellum. Behind the scutellum is a convex 

 triangular area extending as far as the first 

 abdominal segment, the post -scutellum (Fig. 42). 



The scutellum and post-scutellum are of 

 importance in classification. Thus the scutellum, 

 with its ' posterior border bristles,' is often of 

 specific value, whilst the post-scuUem may be — 



1. Bare. Culex said Anophelinae. 



2. With hairs. Wyeomyia. 



3. With scales and hairs. Joblotia. 



