44 INSECTS AND VEGETABLE PARASITES INJURIOUS TO CROPS dusky on the inside; not quite as long as the body, composed of 6 segments, the two basal ones thick and short, the three following of nearly equal length, the apical one as long as the two preceding, annulated and notched near its base (Fig. 5). Pronotum green ; mesonotum green around the edges, brown in the middle; metanotum greenish-brown. Abdomen dark green above, pale at the sides and below, with two brown spots on the sides of each segment. Cornicles (Fig. 1) short, thick, almost uniformly cylindrical, truncated, the sides slightly crenulated.

Legs greenish, thin, of moderate length, tibiae especially hind pair with fine bristles arising from minute papilla, edges of the tibiae especially towards the apex Aphis sorghi or Asal fly. Winged viviparous female. CTeilukted. Venatioil typiCSll (vi(h figUl'C Posterior wings not shewn. 13).

Apterous viviparous female.

Length of body PC to 1*5 mm. Length of antennae 0*8 to 1*0 mm. Antennas (Fig. 11) with four or five segments, the two basal ones normal, the third long and with a constriction apically making the quasi-fifth segment; not quite as long as the body. Head (Fig. 10) showing the frontal lobes indistinctly, the central one with a median groove and a lateral curved bristle on each side. Leers short and thick, the hind tibias with prominent lateral bristles. Rostrum short and thick reaching to nearly halfway between the bases of the first and second pairs of legs ; cornicles cylindrical, brown. Eyes black.

Pupa. The three cephalic processes very small; the antennas (Fig. 8) con¬ siderably shorter than the body, of five segments the two basal ones as in the winged female, the third rather long, the fourth about half the length of the third, the fifth as in winged viviparous female. Legs thick as in the apterous female, tlie hind tibias rather swollen apically and with pale bristles; cornicles (Fig. 3) as in the apterous female, rather shorter than in the winged female. Eyes black.

Larva. Cornicles shorter and more cone-shaped with truncated circular apex.

Aphis sorghi.'S Nearly mature apterous female.