36 DIPTERA OF NORTH AMERICA. [PART IV* 



Sum total of the eight first sections of the Tipulidse (that is, 

 the T. brevipalpi, including the Cylindrotomina and Ptychop- 

 terina) for North America 140, for Germany 133 species. The 

 number of species described in Zetterstedt's Diptera Scandinaviae, 

 embracing Sweden, Norway, Denmark, and Finland, is nearly 

 equal to the total, for Germany. 



The total number of the species of T. brevipalpi in Europe, 

 according to Schiner's Catalogus Dipterorum Europse, is 240, 

 but a proper synonymy would very considerably reduce this 

 number. 



The striking features of the above given table are : 1. That 

 each of the three large groups is represented by nearly the same 

 number of species in both countries; 2. That the number of 

 species in each of the three large groups is nearly equal to the 

 number of species of the other two large groups, and nearly equal 

 to the number of species in the five small groups taken together ; 

 in other words, that both in North America and in Germany, the 

 number of species in each of the large groups is about one-quarter 

 of the whole number ; 3. That the number of species of the 

 small groups is somewhat larger in North America than in 

 Germany. If we extend this comparison to the genera, we will 

 find that the large genera are represented by nearly the same 

 number of species in North America and in Germany (Dicra- 

 nomyia 19 and 15, Limnobia 9 and 12, Erioptera 15 and 15, 

 Rhypholophus T and 6, Limnophila 21 and 29). 



Among the smaller genera, some are common to North Ame- 

 rica and to Europe (we need not confine ourselves to the German 

 fauna here), and others peculiar, as far as known, to one of the 

 two continents. 



The N. A. genera peculiar to the American continent are : — 



Elephantomyia (1 sp.), Toxorrhina (2 sp.), Teucholabis (1 sp.), 

 Eriocera (4 sp.), Gladura (2 sp.), Atarba (1 sp.), Gryptolabis 

 (1 sp.), Plectromyia (1 sp.), Rhaphidolabis (2 sp.), Bittaco- 

 morpha (1 sp.), Protoplasa (1 sp.). Gnophomyia (2 sp.) is re- 

 presented in Europe by Psiloconopa (3 or more species). 



The following genera have been found as yet only in Europe : — 



Elliptera (2 sp.), Orimarga (2 or 3 sp.), Thaumastoptera 

 (1 sp.), and Cladolipes (1 sp.). 



Common to both continents are: Geranomyia (2 Eur., 3 N. 

 Am. sp.) ; Trochobola (2 Eur., 1 N. Am. sp.) ; Rhipidia (2 Eur., 



