428 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 10 



Alate Viviparous Female: Morphological Characters: Antennae measurements 

 as follows: I, O.OS mm.; II, 0.048 mm.; Ill, 0.48 mm.; IV, 0.288 mm.; V, 0.176 mm.; 

 VI, (0.096 + 0.24 mm.). Segment III, armed with from 5 to 7 circular sensoria in an 

 even row on the basal two-thirds of the segment. The sensorium at the base of the 

 unguis of VI, rather elongate, all permanent sensoria fringed; vertex somewhat 

 protruding and armed with prominent hairs about 0.08 mm. long. Cornicles about 

 0.08 mm. long, distinctly imbricated but not reticulated. Wings usual, forewing 

 about 2 mm. long and with the radial sector faintly indicated or almost ab.sent. 

 Length from vertex to tip of cauda about 1.54 mm. • 



Color Characters: Antenna^ yellowish with the base, the distal segments and the 

 distal extremities of III and IV brown; legs, cornicles, transverse bands and lateral 

 spots on the abdomen dark brown to black. Wing veins faintly bordered with dusky; 

 stigma dusky with a clear central area. 



Apterous Viviparous Female: Morphological Characters: Antennal measure- 

 ment as follows: I, 0.064 mm.; II, 0.048 mm.; Ill, 0.48 mm.; IV, 0.24 mm.; V, 0.224 

 mm.; VI (0.096 + 0.304 mm.). Segment III, with about 8 circular sensoria in a 

 row on the basal two-thirds of the segment. Hairs on the vertex about 0.15 mm. 

 long. Cornicles about 0.096 mm. long, imbricated, not reticulate. Length from 

 vertex to tip of cauda about 1.92 mm. Abdominal hairs of about equal length with 

 those on the vertex. Dorsum of abdomen covered with minute projections giving 

 it an almgst granular appearance. 



Color Characters: General appearance dark bro\\Ti. Antennal segments III and 

 IV with dark distal extremities, the distal portions of the antennee entirely dark. 

 Legs dark brown. Head and thorax with large dark brown area. Abdomen marked 

 with large dark brown lateral patches and with transverse dorsal bands of dark 

 brown one on each segment. Remainder yellowish. 



Genus Chaitophorus Koch. 



Chaitophorus lyropicta Kess. Taken on the Norway maple, ^Vleriden, 

 Conn., June 26, 1912, by Louis A. Guidebrocl. Conn. No. 1-16/14. 



This species is abundant upon the Norway maple throughout the 

 eastern section of the United States. The insect is usually con- 

 sidered in America under the name of aceris. It may be distinguished 

 by the proportions of the sixth segment of the antennse. The species 

 varies considerabh^ in size; the antennse of the alate vivipara averaging 

 about as follows: III, 0.592 mm.; IV, 0.368 mm.; V, 0.32 mm.; VI 

 (0.112 mm. -f 0.512 mm.). Segment III is armed with a more or less 

 even row of from 4 to 9 sensoria. 



So far as the writer has been able to discover this species never 

 produces dimorphs. 



Chaitophorus americanus n. sp. Taken on sugar maple, Brookfield 

 Center, Conn., May 10, 1913, by C. Holder; Conn. No. 1-16/13, on 

 Acer sp., Orono, Me., June 1, 1909, by E. M. Patch; Me. No. 18-09 on 

 Acer circinatum at Hoquiam, Wash., June 1903, by A. D. Hopkins 

 and on the same tree at Hoquiam, Wash., August 1903, by H. E. 

 Burke, Bureau of Entomology, No. 97^7. 



There seems to have been considerable confusion in regard to the 

 species of Chaitophorus producing dimorphic forms. Two species 



