208 MAINE AGRICULTURAL EXPERIMENT STATION. I9IO. 



igo6. Colopha ulmicola, Folsom. Entomology. Fig. 249. Photograph 



of galls on leaf. p. 255. 

 1906. Colopha ulmicola, Felt. Insects Affecting Park and Woodland 



Trees. N. Y. State Museum Memoir 8. pp. 172, 186-87, 247, 



620, 633. 

 1878. Colopha eragrostidis Middleton, Bull. 111. Lab. Nat. Hist. No. 2. 



p. 17. Original description. 

 1887. Colopha eragrostidis, Oestlund Aphid. Mmn. p. 29. Listed for 



America. 

 1893 Colopha eragrostidis, Osborn and Sirrine, Proc. la. Acad. Sci. 



/: pt. 3, 100 (Insect Life 5: 237). Suggested identity -nrith 



ulmicola. 

 1893. Colopha eragrostidis, Riley. Insect Life 5 : 235 foot note. Con- 

 sidered identical with ulmicola. 

 1901. Colopha eragrostidis. Hunter Aphid, of N. A. p. 80. Bibliography 



and host plants. 



TETRANEURA GRAMINIS COLOPHOIDEA 



Tctraneiira graihinis Monell. 

 Tctraneura colophoidca Monell mss. 

 Tctraneiira uhni Osborn-Sirrlne. Not Linn. 

 Tetranenira iilmi Sanborn. Not Linn. 

 Tctraneiira colophoidca Howard. 

 Tctraneiira iilviicola Gillette. 

 (Producing a cockscomb-shaped gall on the dorsal side of 

 leaf of Ulmus americana. Fig. 126). 



Descriptive. 

 First generation, — apterous viviparous stem mother. E^^es 

 in a group of three ocelli on each side of head. Head, thorax, 

 and abdomen translucent, pale yellow and pulverulent. Head 

 som.etimes a little smoky. Antennae, beak, and legs (femora,, 

 tibia, and tarsus) dusky. Beak short, not reaching second coxae. 

 Antenna 4-jointed (sometimes 5-jointed by a faint division of 

 HI). HI about the length of I-fll and about twice as long 

 as IV. In the specimen measured, I, 0.05 mm. ; II, 0.04 mm. ; 

 III, 0.1 mm. ; IV, 0.05 mm. Total length of large individual, 

 1.57 mm. Color description from live mature specimens ex- 

 amined July 8, 1909, measurements from balsam mounts. At 

 this date in some galls the stem mother was still plump, in 

 others much shrunken. Habitat, — single stem mother with 

 progeny in cockscomb gall on Ulmus americana. Figs. 172 

 and 173. Maine collection numbers aphid 23-09, aphid 57-09, 

 aphid 65-09. 



