HEUROPTEKA— TRICHOPTEEA— LIMNOPHILIDJ5. 193 



LIMNOPHILUS Burmeister. 



This genus has never been reported fossil, and in placing in it the 

 species below the intention is only to indicate its affinities. The genus is 

 boreal and wide spread, and tlie larvae are generally found in standing 

 water 



LiMNOPHILUS SOPOEATUS. 

 PI. 15, Fig. 5. 



A couple of specimens are referred here, in only one of which is the 

 neuration sufficiently distinct to be determined with any probability, and in 

 this it is somewhat obscure and is not fully shown in the plate ; nearly all 

 the veins and cross-veins in the outer half of the wing can, however, be 

 traced with more or less distinctness, though the cross-veins are certainly 

 obscure; the neuration, as thus limited, is wholly that of Limnophilus. 

 The front wings are moderately long and narrow, the costal margin rather 

 strongly arched in the apical half, curving downward to the bluntly acumi- 

 nate apex, the apical margin sharply and very obliquely truncate Dis- 

 coidal cellules short, much shorter than its foot-stalk ; anastomosis of the 

 lower half of the wing continuous. 



Length of front wing, 12.5°"". 



Florissant. Two specimens, Nos. 1441, 13007. 



INDUSIA Bosc. 



In certain parts of Auvergne, France, rocks are found which for a thick- 

 ness of sometimes two meters or more are wholly made up of the remains of 

 the cases of caddis-flies. These have been frequently mentioned by writers 

 and were first described and figured by Bosc early in the century under the 

 name of Indusia tubulosa. Onstalet in his recent treatise on the fossil in- 

 sects of Auvergne,^ describes two forms, one from Clermond and the othei' 

 from St. Gerand, which he distinguishes under the names Phryganea cor- 

 entina and P. gerandina, principally from their difference in size and strength, 

 and a distinction in the minute shells — species of Paludina — of which tlie 

 cases are composed. 



These cases, like the somewhat similar ones composed of grains of stone 

 which are described below, are all apparently made by species of Limno- 



' Bibl. ficole Haut. Etudes; Sci. Nat., vol. 4, pp. 101-102. 

 VOL XIII 13 



