66 BULLETIN" 826, TJ. S. DEPARTMENT OF AGRICULTURE. 
Genus COLOPHA Monell. 
Plate IX, G-L. 
1877. Colopha Monell, Can. Ent., v. 9, p. 102. 
The genus Colopha was erected for ulmicola Fitch. One of the 
principal characters whereby it may be separated from Tetraneura 
is the once-branched character of the media. The two genera, how- 
ever, are very closely related. The species have the same peculiar 
structure and the same mode of life. 
Characters. — Cornicles slightly elevated rings. Stem mother with four-segmented 
antennae. Apterous form with five-segmented or sometimes six-segmented antennas. 
Wax glands present. Alate form with six-segmented antennas which are armed with 
annular sensoria partly encircling the segments. Fore wings with the media once 
branched, hind wings with only the media present. Forma making galls upon the 
leaves of trees in which the stem mother and her offspring live in company; in summer 
migrating to the roots of plants. 
Type (monotypical), Byrsocrypta ulmicola Fitch. 
Genus ERIOSOMA Leach. 
Plate IX, M-T. 
1818. Eriosoma Leach, Trans. Hort. Soc. London, v. 3, p. 60. 
1831. Myzoxylus Blot, Mem. Soc. Roy. Agr. et de Com. Caen., v. 3, p. 332. . 
1837. Schizoneura Hartig, Jahresb. ii. d. Fortschr. d. ForstAviss. und forstl. Naturk., v. 1, p. 645. 
1848. Mimaphidus Rondani, Nuovi Armali della Scienze Naturali, ser. 2, v. 9, p. 35. 
In 1818 Leach erected his genus in a footnote in connection with a 
paper read by Mosley. The paper was published in 1818. In 1819 
Samouelle published his "Useful Compendium " and on page 232 
characterized the genus Eriosoma Leach MSS. The. printed copy 
of the Transactions appeared complete in 1820. In 1824 Blot used 
the word Myzoxyle which he corrected to Myzoxylus in 1831. For 
these Aphis lanigera Hausm. was used as type. 
In 1837 Hartig erected Schizoneura and of this genus uhni was made 
type by Passerini in 1860. This then will become a synonym. 
Corni Fab. was for a time considered the type of this genus but this 
species was not in the original genus. In 1848 Rondani used Mima- 
phidus with ulmi Fab. as type, which according to Passerini is the 
same as lanuginosa Hartig. Therefore, this genus will become a 
synonym. 
Characters. — Cornicles distinct rings on somewhat elevated tubercles. Apterous 
form with six-segmented antennae. Stem mother with five-segmented antenna}. 
Wax plates present in the apterous and alate vivipara. Alate form with six-seg- 
mented antennas armed with annular sensoria. Fore wings with the media once 
branched, hind wings with both media and cubitus present; cauda and anal plate 
rounded. Forms living in gall-like formations or causing excrescences on their hosts. 
Sexual forms small, apterous, beakless. Only one egg of those of the oviparous female 
develops. 
Type (monotypical), Aj)his lanigera Hausmann. 
