42 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.39. 



PRINCIPAL PARTS OP A WING-BEARING SEGMENT. 



Dorsum. 



Tergum [T). 

 Notum (N). 



Prescutum (Psc). 

 Scutum (Set). 

 Scutellum (Scl). 

 Postnotum, postscutellum (PN). 

 Latus. 



Pleurum (PI). 



Preepisternum (Peps). 



Episternum (Eps) and episternal paraptera (IP, 2P). 

 Epimerum (Epm) and epimeral paraptera (3P, 4P)- 

 TrocJiantin (Tn). 

 Venter. 



Sternum (S). 



Presternum (Ps). 

 Eusternum (Es). 

 Sternellum (SI). 

 Poststernelluin (Psl). 

 Wing (W). 



Wing membrane, including the axillary membrane (AxM). 

 Wing veins — costa (C), suhcosta (Sc), radius (R), media (M), 



cubitus (Cu), anals (A). 

 Axillaries (Ax), first (lAx), second (2 Ax), third (3 Ax), and 

 fourth (4Ax). 

 Leg (L). 



Coxa (Cx). 

 Trochanter (Tr). 



Femur (F), with sometimes second trochanter. 

 Tibia (Th). 



Tarsus (Tar), including claws (Cl,a), pulvilli (Pv), and empodium 

 (Emp). 

 In selecting and inventing names for the parts the writer has 

 used those most in harmony with the system established by Audouin 

 (1824), and, in fact, has retained Audouin's names wherever pos- 

 sible. The prefixes pro, mesa, and meta are reserved exclusively 

 for designating the three thoracic segments or their respective parts, 

 while corresponding anterior and posterior parts of any one segment 

 are distinguished by the prefixes pre and post. Thus, "proscutum" 

 means the scutum of the prothorax, but "prescutum" is the notal 

 subdivision in front of the scutum in any segment. This system 

 leads to a number of hybrid combinations of Latin and Greek terms, 

 but, to avoid them, confuses the significance of the words. Berlese 



