388 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 2 



latter was taken November 16, and the former June 16 at Fort Collins, 

 Colorado. 



Chaitophorus si). About Portland, Ore., and especially along the 

 river from Portland to Oregon City, a species of CJiaitophorus was 

 common upon the leaves of the native vine maple, Acer circinatum. 

 The lice seen were mostly apterous viviparje and dimorphs. The 

 latter were distributed along the main veins of the leaves and upon 

 the wings of the fruit. Most of the dimorphs were decidedly yellow 

 in color but some were growing preparatory to molting and these 

 were quite dark, almost black. Some small very dark lice upon the 

 leaves were probably shed dimorphs. 



The apterous vivipars are very similar to negundinis in general 

 appearance except that they are almost black in color. 



This louse is certainly not negundmis and I can not make it seem 

 possible that it is aceris. The antenna is shorter and the filament 

 much shorter in proportion (see fig. 16) and I can not find more than 

 20 flabellffi in any of the dimorphs, the more common number seems 

 to be 18, or even 16. 



Chaitophorus viminalis. At Chicago, Geneva, Webster and 

 Georgetown, both alate and apterous viviparae were taken upon 

 willow leaves. This species was specially abundant at Geneva. It 

 is an abundant species in the vicinity of Fort Collins almost every 

 year. This species seems to be separated from closely allied forms 

 by the unusually long antennal filament. See figure 17, which shows 

 the antenna of an alate female. 



Chaitophorus populicola. Taken at Portland, Michigan and Fort 

 Lee on aspen, Populus tremuloides. This is a very abundant species 

 in Colorado, at least to 9,000 feet altitude, upon the cottonwoods and 

 aspens. Upon the aspens in the foothills the apterous viviparae are 

 almost entirely shining black in color. They often attack the tender 

 ends of twigs in such numbers as to kill both the leaves and new 

 growth. See figure 18. 



Chaitophorus sp. A small yellowish green Chaitophorus with head 

 a little dusky, was fairly common upon the under side of the leaves 

 of Malva rotundifolia on the grounds of the Experiment Station at 

 Geneva. Apterous viviparae only were seen. The body length 

 varies between 1.10 and 1.25 mm, and the antennas between .77 and 

 .90 mm in the specimens taken. The species seemed rather sporadic 

 in habit. The antenna of an apterous female is shown at figure 19. 



