MYDAID^ 



607 



Type of venation of Mydaid^. 



Fio. 334. — Mydas vittatus <J. 



Longitudinal (or long) veins. 



a Costa (or costal vein), 

 h Mediastinal {or auxiliary) vein, 

 c Subcostal {or Ist longitudinal) vein. 



d Kadial {or 2nd longitiidinal) vein, always ending in the subcostal vein, 

 e Cubital {or 3rd longitudinal) vein, always with a long fork of which the upper 

 or both branches end in the subcostal vein. 



t PPP'^' ^'^^^Hof the cubital fork, 

 e- Lower branch J 



fDiSiCdX {or Ath longitudinal) \Qix\. 



P Upper veinlet from the discal cell, sometimes ending in the subcostal 



vein. 



f^ Second veinlet from the discal cell, (absent in Mydas, but present in 



Mitrodetus (fig. 332), etc., as a vein curved up from the lower end 



of f^ and running parallel with f ' until it ends in the costa close to 



the end of the subcostal vein). 



f^ Third veinlet from the discal cell, bent sharply back in Mydas and 



closing the fourth posterior cell, but sometimes apparently absent 



through the upper branch of the postical fork curving up to the end 



of the discal cell (fig. 335). 



g Postical {or 5th longitudinal) vein. 



g^ Upper branch of the postical fork, sometimes ending in f^. 



g^ Lower branch of the postical fork. 



h Anal {or 6th longitudinal) vein. 



i Axillary vein. 



k Preef urea = the common stem of the radial and cubital veins. 



Ambient vein = the continuation of the costal vein round the hindmargin of the 



wing. 



Cross (or transverse) veins. 

 w Humeral cross-vein. 

 X Discal {or middle) cross-vein. 

 y Lower (or small) cross-vein. 

 Anal cross-vein = g-. 



Cells. 



1 Costal {or mediastinal) cell. 



2 Subcostal cell. 



3 Marginal cell. 



4 Submarginal cell. 



4'' Second submarginal (or cubital) cell (or cubital fork-cell). 



5 First posterior {or subaioical) cell. 



6 Discal cell. 



6* Second posterior cell. 



