10 PROCEEDINGS OF THE ACADEMY OF [Jan., 



and the louse soon flies away. The size varies much, the usual range 

 being between 1.5 and 2 mm. in length. The ivi7igs are a little smoky 

 with a large stigma that is slightly green and the costal nerve is yellow. 

 The fore wing in a medium large louse is about 2.5 mm. long, or about 

 1.6 times the length of the body, with two simple discoidal veins, and 

 one stigmal. Hind wing with one discoidal vein, length of the hind 

 wing about equalling the length of the body. AntenncB dusky, five- 

 jointed, about three-fourths as long as the greatest transverse diameter 

 of the head. Joints 1 and 2 short, stout, cylindrical and about 

 equal in length; joint 1 rather smooth, but the remaining ones with 

 impressed transverse lines or wrinkles. Joints 3 to 5 subequal 

 in length, with joint 3 usually a little stouter and more conical; 

 joints 4 and 5 rather slender, not especially enlarged at distal end, 

 nor swollen for the transverse sensoria, of which there is one to each 

 of the three terminal joints; fifth joint with two short hairs at distal 

 end. The arrangement of glands is shown in PI. IV, fig. A, and is 

 about as follows : On the head two large transverse patches on anterior 

 margin nearly coalescing, and a long narrow patch extending across 

 the hind margin which may be divided at the median line; on the 

 prothorax a long narrow patch occupying the entire lateral margin 

 upon either side, and two long narrow patches along the hind margin 

 nearly meeting at the middle line, and nearly or quite meeting the 

 posterior ends of the lateral patches that are usually reflected mesad a 

 short distance along the hind margin of the segment ; mesothorax with 

 two small patches mesally located near the hind margin, in line with 

 the two middle rows of glands upon the metathorax and abdomen; 

 metathorax with the middle pair of glands only; abdomen with three 

 rows of glands on either side over the first seven segments, except that 

 the middle row is lacking on segments one and two. The lateral rows 

 have the larger patches, and these rows are continued upon the eighth 

 segment; the glands of the middle rows are smallest, and all the four 

 dorsal rows become smaller as they recede from the thorax. The 

 number of gland patches is not constant and the weaker ones are often 

 wanting, and the larger ones sometimes coalesce. 

 Chermes cooleyi var. coweni n. v. 



Tills louse has been injuriously abundant on small trees of red fir 

 in lawns and parks of northeastern Colorado for a number of years. I 

 first observed it on trees standing upon the campus of the Colorado 

 State Agricultural College, where it has been abundant for ten years 

 past at least. A brief description of the winged female was given in 

 Bulletin 31, p. 115, of the Colorado Experiment Station, by Mr. J. H. 



