394 ERNEST A. BACK. 



Fig. 1. — f — first posterior cell. 



g — second posterior cell. 



h — third posterior cell. 



i — fourth posterior cell (closed) . 



j — fifth posterior cell. 



k — anal cell (closed). 



1 — axillary cell (sometimes called the anal angle) . 



m — discal cell. 



n — first basal cell. 



o — second basal cell. 

 Fig. 2. — Thorax of an Asilid. 



pn — pronotum. 



n — neck of prothorax. 



msn — mesonotum. 



sc — scutellum. 



hu — humerus, or humeral angle. 



tr — transverse suture. 



dp — dorsopleural suture. 



mp — mesopleural suture. 



sp — sternopleural suture. 



msp — mesopleura. 



mst — mesosternum. 



ptp — pteropleura. 



hyp — hypopleura. 



mtn — metanotum. 



mtst — metasternum. 



mtp — metapleura. 



hi — halter. 



w — wing. 



spl — spiracles. 



c — pro thoracic coxa. 



c — mesothoracic coxa. 



c — metathoracic coxa. 



1 — first abdominal segment. 



2 — second abdominal segment. 

 Fig. 3. — Tip of front tibia of Deroinyia, showing terminal claw-like 

 spur and its relation to the front metatarsus. 

 " 4. — Diagrammatic, showing the usual direction of spines at tip 



of middle tibia. 

 " 5. — Diagrammatic, showing direction of spines at tip of middle 



. tibia of Chrysoceria and Callinicus. 

 " (') and 7. — Portion of wing of Leptogaster. 

 S. — Abdomen of male Nicocles politus. 



