INTRODUCTION. 1 1 



(1828-30) appeared. They did not introduce any cbanpje in 

 the classification, but added two new gx-nera to the system.: 

 Polymelia and Megiiitocera. 



Macquart, in both of his works {Dipteres du Nord de la 

 France, 1825, and Hist. Nat. des Ins. Dipteres, Vol. I, 1834), 

 retains Latreille's designations : Diptera nemocera and Tipu- 

 larim terricolse. To the latter family, in the last of the two 

 works, he adds the genus Dixa, placed by Meigen among the 

 Tip. fungicolse. He also follows Latreille in subdividing the 

 Tip. terricolse in the hngipalpi (genera : Ptychoptera, Cteno- 

 phora, Tipula, Pachyrrhina, Nejjhrotoma, Pedicia) and brevi- 

 palpi {Ozodicera, Rhipidia, Rhamp)Mdia, Idioptera, Limnophila, 

 Limnohia, Cylindrotonia, Symphcta, Erioptera, Polymera, Me- 

 gidocera, Trichocera, DoUchopeza, Dixa, Anisomera, Chionea). 

 Among these genera Ozodicera, Idioptera, Pacliyr^^hina, Limno- 

 phila, and Gylindrotoma were new. Chionea had been described, 

 in 1816, by Dahnan, and correctly referred to the Tijndidse. The 

 principal innovation of Macquart was the introduction of the 

 genera Pachyrrhina and Limnophila, which broke up Meigen's 

 large genera Tipula and Limnohia. 



The most important publications on the Diptera in general, 

 since Macquart's last quoted works, are Zetterstedt's, Walker's, 

 and Rondani's. Zetterstedt {Fauna Lapponica, 1840, and 

 Diptera Scandinaviee, tenth volume, 1851) introduced several 

 new genera, but did not improve the distribution of the family 

 of Tipulidae. The subdivision into longijMlpi and brevipalpi was 

 entirely abandoned by him, and the genera belonging to these tw^o 

 groups were arranged promiscuously. The genus Chionea forms 

 a separate family for itself, between which and the TipuUdse the 

 Ilycetopliilidse are inserted. Zetterstedt's new genera are Psilo- 

 conopa, Dicranota, T7-icyphona, all of which had been originally 

 adopted in his earlier work in 1840. 



Walker (Insecta Britannica, Diptera, Yol. Ill, 1856) adopts, 

 in the main, Meigen's distribution of the TipuUdse. Macquart's 

 genera Limnopjhila aud Pachyi^rhina are introduced as subgenera 

 only. The genei'a Geranomyia and Ula, originally proposed by 

 Mr. Ilaliday, in 1833 {Entomol. Magaz. Yol. I), are introduced 

 here, and the genus Amalopis is suggested by the same author in 

 a note (Addenda, p. xv), but not introduced in the body of the 

 work. 



