NEUROPTERA TKKTIOF'TKRA. 1 77 



ous larval cases from different regions of Kumpe, but especiallv from Au- 

 vergne in France; it is also proven lv their abundance where we should 

 at first little look fur them, in the I'russian amber, when-, according to 

 1 1. -i gen, thev an- more mum TOMS than anv other 'jroiip of insects, excepting 

 Diptera. and comprise more than half the N'eiiroptera ami PseudoneUTOptera 



Combined. Twenty-five species have been described (by ll.-ejen ami I'ic- 



tet) and several others mentioned I by them and In Kolenati i from amber. 



a large proportion belonging to the Hydropsychidae and especially to 

 Polycentropus, of which eleven species are described. 



Trichoptera are, however, by no means rare at Florissant, and, as 

 stated above, a single species has been described from western Colorado. 

 Indeed, the Neuroptera from the prolific lake bed of Florissant are made up 

 in large part of Trichoptera, of which many hundred specimens have been 

 obtained. The larger part of them, indeed, are indeterminable, but there 

 are about one hundred specimens \vhich show the nenration of the wings or 

 other characteristic part with some distinctness ; and while all the remains 

 of perfect injects from the Furopean rocks are referred to the single sub- 

 family of Phrygaimhe, at Florissant Limnophilida-, Leptocerid:e. and espe- 

 cially Ilydropsychidse, are also represented. The species of this last men- 

 tioned group are also much more, prolific in individuals, and the preponder- 

 ance in species would be even more marked were we able to include here 

 all the species reallv found, since most of those which are too imperfect 

 to be brought forward evidentlv belong to this group. All these groups, 

 and indeed all the subfamilies of Trichoptera, are represented in the Prussian 

 amber. Hydropsychidae are 1>\ far the most numerous, as in our own 

 Tertiaries. Then follow in the order of abundance Leptocerida, Serir< 

 tonmhc, I'hr\ganid:e, Kh\ acophilidie and I Iydroptilid;e. and l,imnophilida\ 

 the la.M having hut one represeiitat i ve. 



\\hile, as \ve have said, the bulk of the specimens of Neiiropten 

 found at Florissant belong to the caddis-Hies, the specific variety of such as 

 will bear description is not quite so great, as lo per cent of all Imlong 

 here; but in relation to any one other lar-e i;roiip the number of species 

 greatly preponderates, as the ^roiip next in si/.e in point of species is the 

 ( Monata, which has less than _'<> percent. ll is not a little curious to 

 compare this >tatenient with I'ictet's concerning the amber caddi>-tli.-> : 

 "Of about one hundred and twciitv N'europtera examined li\' me >i\t\-- 



\..|. Mil 11' 



