384 



a mealy coat, others shiny. Eyes red to black. Antennae 

 very long, similar to the apterous female, but usually somewhat 

 darker, colours varying from palHd yellow to green or olive 

 green. Cauda long and ensiform, but not so long as in the 

 apterous female in some specimens. Cornicles long and thin, 

 often reaching as far as the cauda, pale green to yellow green, 

 dusky just at the tip, imbricated for their whole length. 



Fourth antennal segment not quite as long as the third, 

 the third with a line of 12 to 1 6 sensoria not reaching the apex, 

 fifth about as long as the fourth, no sensoria on the fourth or 

 fifth ; sixth as long as the fourth and fifth or shghtly longer, 

 all the segments faintly striate. 



Wings with yellowish stigma, varying to yellowish green. 

 In some specimens the thoracic lobes are slightly darkened. 

 Length, 2-5 to 3-3 mm. ; wings 9-0 to 9-4 mm. 

 The Pupa. — This stage is much like the apterous female, 

 but the wing-cases are dusky at the apices, and there is now 

 and then somewhat darker mottling and a darker green dorsal 

 line. Like the former, the skin may carry a mealy covering. 

 The third antennal segment shows no sensoria, and the cauda 

 is shorter and broader. 



This species occurs on peas from May until August, but the 

 majority do not occur on the peas until they are well in blossom. 

 Species 2. Macrosiphum loti nov. sp. (PI. XIV, fig. 2 A). 

 Apterous Viviparous Female. — Similar in colour to pisi, but 

 the cornicles are relatively much longer and thinner, the cauda 

 shorter, and the third segment of the antennae has a single 

 reniform sensorium near the base. 



Found only on Lottis corniculatus in July and August at 

 Wye. They are found on the leaves, and also cluster in dense 

 masses on the green seed-pods. They fall readily when on the 

 pods, but hold more tenaciously to the leaves. I have never 

 been able so far to breed the alate form, but nymphae have been 

 obtained.' The single sensorium at once separates it from true 

 pisi. Specimens transferred to late garden peas did not live on 

 them. 



Species 3. Macrosiphum trifolii nov. sp. (PI. XIV, fig. 2 B). 



1 Since this went to press the alate female has been found, and is 

 being described in the Journal of Economic Biology. 



