204 MAINE AGRICULTURAL EXPERIMENT STATION. I9IO. 



5. Slides lent me by Mr. Sirrine containing stem mother, 

 pupae, and 12 winged forms from cockscomb galls on Cork 

 Elm, I. A. C, 7-4-'93- (Figs. 131, 136, 179). 



• Besides the foregoing gall material I have examined as given 

 in the following record, the grass form, the winged individuals 

 of which show no distinguishing characters to separate them 

 from the migrants from the gall. 



6. Colopha eragrostidis. A co-type slide lent me by Mr. 

 Monell, to whom it was given by Miss Middleton in 1877. 

 Two specimens on slide, both of which had M as typical for 

 ulmicola though one Cu was abnormal in one specimen. An- 

 tenna as in vilmicola. 



7. Colopha {eragrostidis) ulmicola. Slides lent me by Mr. 

 Sirrine. Material comprises i apt. vivip. form and pupa from 

 roots, several pupae and 9 winged forms from blades of Era- 

 grostidis sp. Slides bear the dates of 9-28-'92, io-8-'92, 9-9-'93, 

 9-20-'93. Collections made in part at Squaw Creek. Wing and 

 antennal characters as in co-type slide of eragrostidis and as in 

 ulmicola. (Figs. 130, 132, 180). 



The October collection evidence of Osborn and Sirrine, the 

 statement of Riley in regard to the identity of ulmicola and 

 eragrostidis and the structural evidence of the mounted speci- 

 m.ens from the various sources at hand during the present study 

 are conclusive enough, I believe, to make eragrostidis definitely 

 a synonym of ulmicola. For the important experimental evi- 

 dence recorded in letter of Mr. Sirrine the reader is referred 

 tc page • — of this bulletin. 



Following is given the original description of eragrostidis 

 by Miss Middleton which was printed in 1878 in Bulletin No. 2 

 of the Illinois State Laboratory of Natural History: 



"Colopha eragrostidis, new sp. 



"Winged individual.— Gen&ral color reddish-brown; head black; pro- 

 thorax yellowish, rest of the thorax and abdomen reddish brown; veins 

 ■of the wings dark ; stigma pale brown. 



"Wings, when first seen horizontal, but becoming erect, formed and 

 veined as usual; the third vein in the anterior pair with only one fork 

 and obsolete nearly half way to the base of the fork ; the first and second 

 veins approximate very closely at the base. Posterior pair with but one 

 discoidal vein. 



"Antennae six jointed, with the sutures between the third and fourth 

 and between fifth and sixth transparent; first and second joints short; 

 third about equal to the fourth, fifth and sixth utiited ; the fourth and 



