318 On the Diptera of the Amber-fauna. 
— identical and showing no difference whatever, a large 
number of species has to be recorded, which, if they had been 
found in Europe, — certainly have been considered only as 
slight varieties of other well-known European species, as their 
only deviation wleocign consists in a slight difference of coloring; 
but this difference being a very constant one, it becomes extreme- 
ly difficult to decide w hether such species should be considered 
as specifically distinct from the corresponding European species, 
or as identical with them.’ A third, not less numerous category 
of species, shows, besides these slight but constant differences 
relative length of the wings or the sion to the whole bole ete., 
differences which, in order to be brought to light, sometimes re- 
: — the comparison of a whole series of specimens.‘ A fourth 
matodes Fab.), Platychirus granditarsus Férst., Brachyopa ag east Fall., Sceno- 
alli 
pinus fenestralis Linn, (=pallipes Say), Scenopinus leer vifron , Dolichopus 
brevipennis Meig., Dol. plumipes Scop., Dol. discifer Stann., Se wchoks pinnae Zett, 
Prsilopus pallens Wied.. (= albonotatus Lew), Oestrus bovis Fab., yia oe 
Linn, Gastrus Equi Lin lanophora roralis Linn., lis Fab , 
domestica — Cyrtoneura meditabunda Fab,, C. stabulans Fall., Meeneda 
ealcitrans Linn., Anthomyia diaphan ed., Anthom, stygia 
ig., Arici oides Hylemyia Angelice Scop., Hudrotea dentipes, Hy 
‘yia Babee 9 Meig., Homalomyia canicularis 4, manieata, 
m Lin., H, subpel/ucens 
aris Fab., Hydrotea armipes Fall., Ophyra leucostoma Wied., Lispe uliginosa 
Fall, S Scatophaga squalida (=S. fureata Say ?) Seatophaga stereorea Lin., Cordylura 
hireus, omyza lupulina Fab., Seyphella flava Linn., Jeusonie cy bales ane 
Fab., Lauxania frontalis Lw., Psila bicolor, i nana Fall, Seiom 
Fall, Sciomyza albocostata Fall., Dryomyza anilis F t Btepharspire jae 2 Ortals 
débrces Li ie Ate : Meiz., 
P! 
Y, . W., 
Fall., Scatella Stenhammari Zett , Ockthunes mantis Deg., Ilythea spiloa Hal. 
phagus ovinus Linn. Olfersia Arde Macq.. Hippobosea equina Lin 
Besides a great ma uy other species, the occurrence of which on both continents is 
recorded with less certainty, the following European sis sies are found in G Greenland, 
according to Steger’s trustworthy statements -——Diamesa Waltlii Meig. .» Ohirono- 
mus eee — Chironomus aterrimus Meig., C Chicindinin 8 picipes — ‘ preter 
ipennis Meig., fare a flavipes Meig., “Calliphora erythrocephala M 
Phiyjtomysa obbeatuile Fal 
[Rhipidia a. M. cad Symplecta punctipennis may be also added with cer- 
ACK 
M Asi instances of such species may be re aie ye hem the North American set 
and Chrysotoxum bie msgid Linn, elanoceré pictigen Lew. and 7. Un Lion, 
elanocera and 7 -Peaietun; Fall, Hemerodromia valida Lw. and 
#. canal Zett. 
s ere may be named: Bombylius fraterculus Wied. and the European 
B. major 
eyes sotorum sp. indeser, i Chrysotoxum fasciolatu: m Deg., Helophilus *P 
fates and H, rm Fab., cia sp. gh ciel L. peer, on M., Cyrtone rion, 
‘Sp. indeser. an, C. assimilis Fall., Gymnosoma par Walk. and 
a te | C. pudica Meig., Allophyla levis Lw. and A. nar 
cornis Meig., Pigpets feateia Lw. and 7 Heraclei Liun., Ortalis re ena L 
pe ten fom ban ata @ sp. indeser. and D. funebris, Hphydra rae 
and E. micans many other species, 
