58 



Memoirs of the Indian Museum. 



[Vol.. Ill, 



in the middle, or wavy, more or less distant from the first, rarely bearing a stump 

 of vein. 



5. Third longitudinal vein (Radius 4 -I- 5, R, ) or cubital vein : bare or bristly 

 over its whole length, at base alone, or to the small cross- vein ; straight or bent ; 

 parallel or diverging from the fourth, rarely converging with this ; more or less 

 approximate to the second. 



6. Fourth longitudinal vein (Media, M.) or discoidal vein: straight or curved 

 after the hind cross- vein or very rarely curved forward at its tip. 



7. Fifth longitudinal vein (Cubitus, Cu.) or postical vein : bare or very rarely 

 bristly over its whole length, more or less diverging from the fourth. 



8. Sixth longitudinal vein (Analis, An.) or anal vein : more or less long, reach- 

 ing or not reaching the hind margin. 



9 Axillary vein (Axillaris, Ax.) : very indistinct. 

 10. Humeral cross-vein, or basal cross-vein : on fore border at the base, between 

 costa and auxiliary vein, less important. 



_PiG. 3. — Wing of a Trypaneid, showing typical neuration. For explanation of the numbers see text. 



11. Small cross-vein, or anterior, or median cross-vein: towards the middle, 

 between third and fourth longitudinal veins, very important; placed before, on, or 

 after the middle of the discal cell ; long or short , oblique or perpendicular. 



12. Hind cross-vein, or posterior cross-vein : on the posterior portion near the 

 hind margin between fourth and fifth veins ; long or short, oblique or perpendicular, 

 parallel or not with the small cross-vein. Very important is the distance between 

 the small and the hind cross- vein , in relation to the position of the small cross-vein ; 

 this distance can be measured by reference to the length of the hind cross-vein ; or, 

 following Rondani, by the relative length of the various portions into which the 

 fourth vein is divided. These portions are: the first or basal, between the basal and 

 the small cross-vein ; the second or median, between the small and the hind cross- 

 vein ; the third or apical, between the hind cross-vein and the end. 



13. Basal cross-vein, or anterior basal, or discoidal cross-vein : in the middle of 

 the base, between fourth and fifth veins, less important. 



14. Anal cross-vein, or posterior basal cross-vein: at the base below the 

 preceding, between fifth and sixth veins, very important ; straight, convex or con- 



