I/O MAINE AGRICUIvTURvVI. EXPERIMENT STATION. I912. 



light but vivid green and thickly speckled with fine dark dots. 

 This specimen was bred from pupal nymph collected June 30. 



Pufa green with antennas and legs with dusky tips. Antennae 

 with 5 joints, green at base but dusky over the rest. Beak ex- 

 tends to 3rd coxa. About 12 transverse rows of fine dots on 

 abdomen arranged as follows : Alternate rows of 8 dots, the. 

 2 lateral ones largest and alternate rows of 4 subequal dots. 



Fig. 287. B. calif ornicus. Antenna of apterous viviparous female. 



Apterous viviparous female. Color about as in pupa. Beak 

 reaches ist abdominal segment. The beak of apterous and 

 alate forms is the same characteristic shape, shown in figure 

 286. The antennae 5-jointed and usually with no sensoria, ex- 

 cept the usual distal ones on the last and next to last joints. 

 There was one exception in which III had a single large distal 

 sensorium as shown in Fig. 287. The bases of the setal hairs 

 on III and other segments frequently very distinct. 



The eyes of the emtryos are very red and give the abdomen 

 of the viviparous forms a red spotted appearance. 



Monocotyledons. 



The species of aphids infesting the monocotyledonous plants 

 of Maine include several widely distributed pests, among which 

 are the especially troublesome Europeai^ Grain Louse migrating 

 from grains to apple, the corn leaf aphis, and the practically 

 omnivorous Mysus persicae. Others no less interesting though 

 of less economic significance occur as is recorded in the follow" 

 ing discussion. 



Aphis abbreviata n. sp. Some leaves of water plantain 

 which were brought in for the sake of a large colony of 

 Rhopalosiphum nymphae proved to be colonized also by a little 

 pale green Aphis. 



Alate viviparous female. Head and thorax black. Abdomen 

 green. Antenna imbricated ; III with from 8 to 12 large cir- 

 cular sensoria extending along the whole length, IV with 3 to 6 



