OF CADDIS-ELIES DESCEIBED BY LINN^US. 731 



tiou, to couvince us that tlie author did not intend the Sialis, whicli 

 he, moreover, probably describes as Semerolius lutarms at p. 384 

 (No. 1513). His words, " Sedet alis deflexis uti PhaleDua," clearly 

 indicate the family to which it belongs. If used in comparison 

 with all the foregoing species, they have special v/eight, for of the 

 next following (P. licaudata) is said " alse incumbentes, non de- 

 flexis." The same may be said of the words " Cauda simplex absque 

 sty lis prominulis," whereas the following species is indicated by 

 " Cauda duabus setis autenniformibus." It is therefore a true 

 " Phryganea''^ and not a Ferla. Its v/ings are described as "re- 

 ticulatae ; venis fuscis maxime reticulatis, prsesertim ad margine 

 exteriorem." The colour of the wings has thus some resemblance 

 to that of P/«. reticulata, Yi. ; and the insect can be sought for neither 

 amongst the Limno'pliilidcB nor the Leptoceridcs, for there is no 

 species in these families with such a colour. Only the Sydro- 

 psychidce and Mhyacopldlida remain, and it is possible that in one 

 of these the species may be found. The families have the " margo 

 exterior " (inner margin) " admodum dilatatus " in comparison 

 with the others, and some of them by day are more tranquil than 

 is usual, thus justifying the use of the words " ubi sedet tranquilla." 

 The words " os duobus denticulis et quatuor a palpis " point to a 

 Hydropsyclie and not to a JRliyacopliila, which the strong fuscous 

 reticulation also makes clear. The denticulation of the mouth 

 and palpi is such that it may not have escaped the notice of such 

 an acute observer as Linuseus. His words probably refer to the 

 maxillary processes and the processes of the labial palpi ; but 

 the words " antennae corpore dimidio breviores " seem to nullify 

 this supposition. Tlie antennas in Hydrojpsyclie are seldom longer 

 than the wings, but they are always more than half the length of 

 the body. They may have been broken in Linuseus's type, as 

 they were in that of his Ph. pJialcenoides, of which he equally says, 

 " antenna) corpore dimidio breviores." I am therefore convinced 

 that he did intend a Hydropsyclie ; and among the Swedish species 

 only a. instahilis auct. could be intended, for the description 

 agrees tolerably well v.ith it. The wings are cinereous, their 

 fuscous reticulation is especially strong toward the inner margin, 

 and the thorax is yellowish at the sides. 



Phetganea bicaudata (No. 1489) is a Perla, as is well known. 



Ph. nigka (No. 1490) is Mystacides atra, Pict., as I have already 

 hown in the Ofv^ersigt af K. Yet.-Ak. Porhandl. 1870, p. 151. 



