230 
General Catalogue of the Homoptera 
Haupt 1912b: 449 (4) [List of species from Thu¬ 
ringia] 
Horvath 1912e: 567 [Listed] 
Licent 1912a: 56, 59 [Physiology of digestive system] 
Oshanin 1912a: 98 [List of species from the Pale- 
arctic Region] Equals Ptyelus Le P. and 
Serv. (in part.) 
Schmidt 1912g: 151 [Listed] 
Boring 1913a: 134, 135, 137, 139 [Spermatogenesis] 
von Dalla Torre 1913a: 150 [List of species from 
Tyrol] 
Melichar 1913a: 323 (5), 324 (6) [Comparative 
notes] 
Melichar 1913e: 6 [Listed] 
Strand 1913a: 270 [Listed] 
Van Duzee 1914c: 388 [Nomenclature] 
Boring and Fogler 1915a: 314 [Comparative note] 
Jacobsen 1915a: 320 [List of species from Denmark] 
Jensen-Haarup 1915a: 39 [Key] :40 [Described, 
key to species from Denmark] 
Cogan 1916a: 173 [Key] :175 [Described] 
Osborn 1916b: 278, 279 [Comparative notes] 
Van Duzee 1916a: 57 [List of species from the 
Nearctic Region] Equals Ptyela Germ, [in 
part.] Equals Ptyelus Lall. (in part.) Equals 
Cercopis Kirk, [in part.] 
Metcalf 1917a: 28 [Listed] :29; PI. II, Figs. 17, 18 
[Venation, illustrated] :32; PI. I, Figs. 7, 8 
[Tracheation, illustrated] 
Van Duzee 1917b: 513 [Catalogued] Equals Ptyelus 
Lall. (in part.) :514 Equals Ptyela Germ, [in 
part.] Equals Cercopis Kirk, [in part.] 
Ball 1919d: 147 [Comparative notes] 
Gibson 1919a: 100 [Comparative note] 
Haupt 1919a: 162 [Key] :165 [Key to species from 
Europe] 
Lyle 1919a: 7 [Listed] 
Britton 1920a: 55 [Listed] 
Jensen-Haarup 1920a: 73 [Key] :76 [Described, key 
to species from Denmark] Equals Ptyelus 
Oliv. [in part.] 
McAtee 1920b: 172 [Key] 
