358 SOME SOUTH INDIAN INSECTS. ETC. 



COW-PEA AGROMYZA. 



i romyza. The small figure shows the natural >i/i 



(Original.) 



Distribution. — Coimbatore ; Tinnevelly. 



Lifehistory. — The larva; bore into the stem, a number being found 

 in the same plant, plants thus attacked wilting. Pupa in larval 

 burrow. 



Foodplants. Cow-Pea (Vigna catjang). Lab-lab (Dolichos lab-lab), 

 Green-gram (Phaseolus mungo). 



Status.— A serious pest of young plants. 



Control- — ? 



SYRPHID/E. 



syrphus spp. (Plate XV.) 



Distribution. — Throughout Southern India. 



Lifehistory. The eggs are laid singly on plants attacked by 

 Aphids, on which the larva,- feed. The larva are variable in 

 colour, usually greenish, sometimes with red markings; they teed 

 on Aphids which they seek out and devour greedily. Pupation 

 usually on a leaf, in a sort of cocoon formed by the cast larval skin. 

 The flies themselves have often a wasp-like pattern of markings 

 anil fly very rapidly or hover in the air. 



Status. Extremely beneficial as a natural control of Aphitls. 



TABANID.L. 



I \l; \\l S STRIATUS, Fb. 



Tabanus striatus, Fab., Em. Syst., IV. 371 ( 1 7^4> : van der Wulp, 



Cat. Dipt. S. Asia, p. 58 (1896); Kertesz, Cat. Dipt.. Ill, 281 (1908); 



Howlett, Ind. Ins. Life. t. 42. f. 2; Mit/main. Philippine Jl. Sci. 



VIII-B, 107 218, tabs. (June H;i3), /.<'. 223 -229- 



