APHID PESTS OF MAINE. 1/7 



July 28 winged females had entirely disappeared ui our breed- 

 ing cages, though young were still numerous on the bulbs; later, 

 all disappeared. An investigation about the middle of August 

 resulted in finding no living aphids in the storage warehouse or 

 upon the plants in the field. It is stated that when digging in 

 October a few plant lice may be found upon the bulbs. These 

 evidently remain in a dormant condition till the house warms up 

 in the spring as described above." 



Aphis rumicis Linn. Collection 84-08 made from stalk of 

 Gladiolus Orono, Sept. 15, 1908, comprised apterous and alate 

 viviparous females and pupje of this general feeder. It can be 

 distinguished from gladioli which is apparently closely allied by 

 the following structural differences. Rumicis is a much larger 

 species and the lateral tubercle of prothorax, and first abdominal 

 segment (Fig. 297) and the lateral one between cornicle and 

 Cauda, are very large and pronounced, while in gladioli these 

 are relatively small though distinct. The cornicle and antennae 

 of rumicis are figured by Gillette (1910, p. 406) and accord in 

 essentials with those from the Gladiolus though Fig. 298 is 

 given for the slight variation. It will be noticed that while 

 basal VI of gladioli is nearly subequal to V and IV-f-V are 

 shorter than III, neither being equal to 1-2 III ; in rumicis basal 

 VI is subequal to 1-2 V and I\^-j-V are longer than III, each 

 being longer than 1-2 III. Ill and IV in gladioli both bear more 

 sensoria than rumicis. Figs. 312-313 give the wing of this col- 

 lection. The following notes on rumicis (84-08 ") from Gladiolus 

 are copied from my record sheets : 



Alatc viviparous female. Head black, antennal measure- 

 ments — I, 0.1 mm; II, o.i mm; III, 0.35 mm; IV, 0.2 mm; V. 

 0.225 mm; VI, base 0.13 mm; spur, 0.35 mm. Ill with about 

 18 large sensoria, IV with 3 or less and V with none except 

 distal one. The prothorax is shiny black with very prominent 

 lateral tubercle. Thorax shiny black, veins of wings dark and 

 slender. Abdomen ,blackish green with black intersegmental 

 lines, and with irregular large black lateral spots on 2nd, 3rd 

 and 4th segments; ist with large lateral tubercle like that of 

 prothorax and a similar one between cornicle and cauda. Corni- 

 cles black and shaped as in Gillette's figure (1910, p. 406). 

 Cauda black at tip, base greenish brown. Wings are shown in 

 Figs. 312 and 313. 



