THE CANADIAN ENTOMOLOGIST. 15 



d. Wings hyaline C. caryae 



(id. Veins bordered with brown C. quercicola 



COLOPHA COMPRESSA (Koch.) 



Schizoneura compressa Koch. Pflzl. 1854. 



Byrsocrypta ulmicola Fitch. Fourth N. Y. Rep't, 1858 §. 347. 

 Thelaxes ulmicola Walsh. Gen. Am. Aph. Proc. Phil. Ent. Soc. 

 I, 1862, p. 305. 



American Entomologist, I, i86g, p. 224. 

 Colopha ulmicola Monell. C. E. ix, 1877, p. 102. 

 Glyphina ulmicola Thomas 1. c. p. 142, 1879 



Colopha cotnpressa Lichtenstein. Les pucerons des ormeaux. 

 Feuille des Jeunes Naturalistes, 1880. 

 American Entomologist, iii., p. 76, 1880. 

 This insect has been referred to six different genera. The synonymy 

 of this species up to 1877 has been discussed in the C. E., ix., 102. 



The genus Glyphina was insufficiently characterized by Koch. The 

 species upon which it was founded, G. Befnlae, is referred to the genus 

 Vacuna by Passerini (1863), Walker (1870) and Kaltenbach (1874) under 

 the name of V. alni Schrank. 



Some doubts existed as to whether intermediate forms would not be 

 found connecting Vacuna and Colopha, as it has been found that the 

 number of joints in the antennae sometimes vary (see Lichtenstein, 

 Entom. Monthly Mag., March, 1880), but Prof. Riley, who has investigated 

 this subject with his usual ability, has succeeded from biological evidence 

 in establishing the right of Colopha to rank as a separate genus. 



According to Mr. Lichtenstein, of Montpellier, the true female of 

 Vacuna has a rostrum and lives about a month sucking at the leaves. In 

 Colopha, on the other hand, the true female has a rudimentary mouth and 

 dies with the egg in the body. Judging by analogy with Tetraneura, it is 

 probable that the true female lives but for a few days. The validity of the 

 genus Colopha is acknowledged by Lichtenstein, Kessler, Loew and Fr. 

 Thomas, but all of these gentlemen concur in considering the European 

 6". compressa Koch identical with the American B. idmicola Fitch. 



Tetraneura Hartig. 



Byrsocrypta Hal (in part), nee Walsh. 

 Antennae short, six-jointed. 



