86 THE CANADIAN ENTOMOLOGIST. 



sometimes not complete is always indicated, a single sensoriuni 

 near tip of IV and the usual group at base of spur. Legs dusky 

 yellow, tarsi and distal extremities of femora of second and third 

 pairs darker. Cornicles and cauda as in alate form, the former 

 closely appressed to the abdomen in life. 



Measurements — Length of body L63 mm., width .93 mm. 

 Length of antennal segments, I .07 mm., II .05 mm., Ill .14-. 176, 

 aver. .16 mm., IV .088-. 124, aver. .10 mm., V .106-. 124, aver. 

 .12 mm., VI base .088-. 106, aver. .10 mm., spur .212-. 247, aver. 

 .23, mm., total length .839 mm. Cornicles, length .265 mm. 

 Cauda, length .088 mm. 



Pupa — Head, thorax and abdomen dark mottled green. 

 Antenna? dusky yellow at base, shading to almost black at tip. 

 Eyes dark red. Wing pads pale yellow with greenish tinge. Legs 

 pale yellow. Cornicles as in alate form, though more robust. 

 Cauda not apparent. Length of body 1.26 mm., width .79 mm. 



The young are pale yellow or greenish when born and gradually 

 darken as they approach maturity. 



The species agrees well with Wilson's definition of the genus, 

 except that the apterous forms have indistinctly 6-segmented 

 antenna? instead of 5-segmented as he gives it. The division 

 between III and IV is plainly indicated in all the specimens I 

 have seen and in many is complete. 



This aphid was first found at Lakeland, Florida, in November, 

 1912. Further observations were made during the following 

 winter and during the winter of 1913-14. Specimens were sent to 

 Mr. J. J. Davis and Mr. J. T. Monell, both of whom pronounced 

 it a new species of Carolinaia. I am indebted to them and especially 

 to Mr. J. J. Davis for assistance in the preparation of this paper. 



The species appears to be rather generally distributed through- 

 out Florida, for it has been taken at a number of places throughout 

 the state and as far north as Gainesville. Cyperus esculentus, 

 which in its wild form is the pestiferous nut-grass of the south and 

 in cultivation is known as the chufa, is its only observed food 

 plant. It thrives on chufa in cages and colonizes it readily when 

 available in the field. Other species of Cyperus growing in close 

 proximity to infested plants of esculentus were examined repeatedly, 

 but the aphid was never found on them. 



