1915] __ Distribution of Neuropteroid Insects 133 
2. Genera representing relicts of probably an ancient 
invasion from South America, possibly through the West Indies, 
and after South America had been connected to Africa or to a 
Pacific continent. These genera are isolated systematically in 
our fauna, forms that look out of place in our insects, and 
usually unrepresented in Europe either recent or fossil, at least 
northern Europe. Such in the Neuroptera are Dilar, Amphien- 
tomum, Neoperla, Leptocella, Ganonema. 
In Coleoptera, Cupes, Ischaha, our Lymexylon, Othnius, 
Passalus, Pseudomorphus, Brenthus. 
In Hemiptera Hentcocephalus, Cylapus, Fulvius, Isometopus, 
probably Belostoma, Oncerotrachelus, Ceratocombide, Rhagovelia. 
In Hymenoptera, Rhinopsis, Pelecinus, Leucospis, Stizus, 
Pristocera. 
In Diptera, Phlebotomus, Nemistrinide, Mydas, Calobata, 
Sphyracephala, Euxesta, Pyrgota, Blepharoceride, Stylogaster, 
Systropus. 
In Lepidoptera Feneseca, Thyris, Stenomma, Hemerophilide, 
Halesidota. 
In Orthoptera, Camptonotus. 
It will at once be noted that this element is almost wholly 
Eastern, and is the element that distinguishes our Eastern 
States both from the Western States and from Middle and 
Northern Europe, in fact a tropical element still present with 
us, and most noticeable in mid-summer. 
3. Genera originating in this country from an insect fauna 
of which 1 and 2 are the relicts. These are genera confined to 
the United States but whose affinities are rather with South 
American or Asian insects than with European. I consider that 
this fauna had a long period of quiet development and became 
very extensive. The Miocene fossils perhaps represent this 
fauna. 
In Neuroptera, Meleoma, Betisca, Polypsocus, Paraperla, 
Neophylax, Heteroplectron, Nannothemts, etc. 
In Coleoptera, Sandalus, and many other genera. 
In Hemiptera—Siznea, Corythuca, Araphe, Corynocoris, Tel- 
amona, Cyrtolobus. 
In Hymenoptera, Lyroda, Grotea, Labena, Ceratogastra. 
In Diptera, Eclimus, Pelastoneurus, Bittacomorpha, Eutreta, 
Acrotoxa, Pseudotephritis, Idana. 
