240 MAINE AGRICULTURAL EXPERIMENT STATION. I91O. 



2^, igo8. Orono. Apterous viviparous forms which give birth to the 

 true sexes. 



Fig. 164. Tetraneura ulmisacculi. Migrant from gall. Fig. 165. An- 

 tenna of foregoing, (a) one of the common variations of VI showing 

 "run-together" annulations. Fig. 166. Antenna of pupa, (a) showing 

 annulations of mature antenna through the pupal skin. Fig. 167. Stem 

 mother. Fig. 168. Antenna of stem mother. 



Fig. 169. Tetraneura graminis (colophoidea). Migrant from gall. 



Fig. 170. Antenna. Fig. 170 (a) reverse side of IV showing avmula- 

 tions. Fig. 171. Antenna of pupa. Fig. 172. Stem mother. Fig. 173. 

 Antenna.- Fig. 174. Apterous viviparous form not stem mother fre- 

 quently found in gall. (See page 209.) Fig. 175. Antenna of fore- 

 going. 



Fig. 176. Colopha ulmicola. Antenna. II-VI. Slide (157) lent by 

 J. T. Monell. Specimen collected July 2, 1876. St. Louis. "Type or 

 co-tj^pe of the genus Colopha." 



Fig. 177. Antenna III-VI of specimen collected June 12, 1909, at 

 Lawrence, Kansas. Specimens given by C. P. Gillette. 



Fig. 178. Colopha ulmicola. Antenna III-VI from specimen collected 

 at LeRoy, 111., July 10, 1907. Fig. 178 (a) Antenna V-VI of second 

 specimen in same collection showing variation in annulatijDns common to 

 this species. Slides lent by J. J. Davis. 



Fig. 179. Colopha ulmicola. Antenna I-IV of stem mother removed 

 from gall. Slide (7-4-93. I. A. C.) lent by F. A. Sirrine. Antennal 

 measurements I, 0.035 mm.; II, 0.04 mm.; Ill, o.i mm.; IV, 0.06 mm. 



Fig. 180. Colopha ulmicola (eragrostidis). Antenna. (I-IV) of 

 apterous viviparous form from, root of Eragrostis. Slide (10-8-92) lent 

 by F. A. Sirrine. Antennal measurements I, 0.025 mm.; II, 0.025 mm.; 

 Ill, 0.035 mm.; IV, 0.035 mm. 



Fig. 181. Tetraneura graminis, antenna I-IV of true female, previous 

 to molt. Slide (10-4- '92) lent by F. A. Sirrine. Fig. 182. Distal tip 

 of leg of true female previous to molt, showing capitate hairs. Slide 

 (io-4-'92) lent by F. A. Sirrine. Fig. 183. Antenna I-V of larva on 

 roots of Leersia virginica. Slide (I. A. C. 9-30-'92). Slide lent by F. 

 A. Sirrine. 



Fig. 184. Tetranetira graminis {colophoidea). Normal venation.* 

 1987 fore wings out of 20GO examined had this venation. 



Figs. 185-197. Tetraneura graminis {colophoidea). Abnormal vena- 

 tion. The 13 wings out of 2000 examined which deviated from the nor- 

 mal. In even these 13 cases the wing on one side was normal. 



Note : Figures 164 to 172 were drawn by Miss Charlotte M. King. 

 Photographs were taken by Mr. R. Hammond. 



*For Comstock-Needham terminology of Aphid wings the reader 

 is referred to "Homologies of the Wing Veins of Aphididae, Psyllidae, 

 Aleurodidae and Coccidae." Annals Entomological Society of America. 

 Vol. II, No. 2. 



