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 — prothoracic coxa, 

 c — mesothoracic coxa. 

 c — metathoracic coxa. 

 1 — first abdominal segment. 

 2 — second abdominal segment. 

 Fig. 3. — Tip of front tibia of Deromyia, 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. 

 " 6 and 7. — Portion of wing of Leptogaster. 

 " 8. — Abdomen of male Nicocles politus. 



