NEDROPTERA TRICHOPTERA HTDROPSYCFII D.K. 179 



which alone are found, ami that therefore the larva; of Hydropsychidae 

 must have frequented perforce the neighboring streams, where such l.-i 

 stone surfaces could have been found. It' cases ~li<>uld lie found they will 

 be likely to be those of the larger Phryganidae (n<-\t most aliuinlant after 

 the Hydropsychidae), composed of vegetable fragments. Three species and 

 -seven specimens only of this group have been found. (Februarv, 1*84.) 



Subfamily HYI >I{OPSYCH I I >. K ( Jurtis. 



Although no members of this group have been found in the stratified 

 deposits of the Old World, about half of the numerous species described 

 from the Baltic amber belong to it, including several genera. It is intend- 

 ing, therefore, to find that about three-fourths of the Flori>-aut caddis-llies 

 described in this work belong here, and in the material too poorly preserved 

 to bring before the public the greater part also belong here. Here, too, tin- 

 species seem to be far the most abundant in individuals. Among those, de- 

 scribed below are not a few very aberrant forms, which I have been at a lo-s 

 to determine, as certain of them seem on some accounts to be more nearlv 

 related to the Leptoceridsc. At the present day the suhfamilv appe.-irs also 

 to be the most numerous in species in the northern hemisphere, and thev 

 are found all over the world. The larva- more commonly fretjuent running 

 than standing water, make fixed cases, and are believed to be to a large 

 extent carnivorous. 



Tul'li nf Hi' i/i urn: iif fll/drii/liili-lliliir. 



(Only I lir rxtmrt, ni'wly ili'<rrilii'd CI-MIT:I, in which tin- lifili :ipi. al < rll and smnrtinjfR Rome of the 

 ntht-r apical cells nl Ilif Ion- win^s arn wjiiitiii^, ;irr IHT.- i.ilMiln, .1. 

 First apical cell present. 

 Second apical rrll pri"~ 



Mi'ilian n'lliili' mic-tliiril or scarcely inun- than niii'-ilnril :i- lon^ ax tin- win;; ..if. I>rrobrt>fhu>. 



Mrilian ri'llnli- inn'- half as long as tho winj; I. / <>, ,!:',, ,-huf. 



Second apical rrll a lisrnt .-,. /../.'..hrnrhiu. 



First api.'al ri'll alf-i-nt. 



I i, . . l.l al IT II iiprll I 1 .. \l, ' ,-nchu. 



Dixcoidal cell closed 7. , 







1. HYDROPSVCIIK Pictet 



Tho two species placed here by u^ I'roni the American Tertiaries are 

 referred to the "vniis in its ancient wide sense as n-pr.^eutative of the group 

 to which it belongs. No fossils have pi'eviousK been referred to it. 



