152 Mr. R. MacLaclilan's Monograph of 



1. SiALis LUTARiA, Linne. 



Hemerobius lutariiis, Linn. Faun. Suec. 384 (1761), 

 according to Linnets collection ; Semhlis lutarius, Fab. 

 Spec. Ins. i. 387 ; Ramb. Nevrop. 447 ; Sialis lutarius, 

 Steph. 111. vi. 133 ; Pict. Ann. Sci. Nat. v. pi. iii. figs. 

 1, 4 J 8. lutaria, Burm. Handb. ii. 947 ; Brauer, Verli. 

 z.-b. Verein. 1856, p. 397, Neurop. Aust. 52. Sialis 

 m^er, Lat. Hist. Nat. xiii. 44 (1805). Phryganea jlavi- 

 latera, Linn. Faun. Suec. 379, ?. 



Dark blackish ; head with some yellowish impressed 

 spaces in the middle posteriorly, and at the sides. Tarsi 

 paler. 



Wings pale smoky, scarcely darker at the base ; the 

 veins black, paler at the base of the costal margin ; the 

 transverse nervule in the suh- costal area of the anterior 

 wings placed towards the base of the first cellule between 

 the radius and sector (PI. VIII. fig. 1, indicated at a). 



Apex of the ahdonfien of the ^ above forming a fleshy 

 lobe, in which is a concave space with a prolongation in 

 the middle ; from this lobe proceed two curved, cylin- 

 drical, semi-transparent ai^pendices, which are seldom 

 seen unless pressui^e be applied to the abdomen of the 

 living insect ; ventral valve very large and obtuse (PL VIII. 

 fig. 1 c) . 



Length of body 4-7 lines; expanse of wings 11-16 

 lines. 



Very abundant everywhere in the neighbourhood of 

 water, in May. 



This insect bears the label " lutaritis," in Linnets own 

 hand-writing in his collection ; but, his description is 

 far more like his Phryganea jiavilatera. The figure in 

 Schiiffer's Icon. Ins. Ratisb., referred to by Linne as 

 representing his lutariiis, is undoubtedly one of the 

 smaller Perlida: ; but the Sialis is well figured by Schafi'er, 

 tab. xxxvii. fig. 9-10, and Linne does not quote this figure 

 in his notice of P. Jiavilatera. 



2. Sialis puliginosa, Pictet. 



Sialis fuliginosa, Pict. Ann. Sci. Nat. v. pi. iii. fig. 6 

 (1836) ; Burm. Handb. ii. 947 ; Brauer, Verh. z.-b. 

 Verein. 1856, p. 397, Neurop. Aust. 52. 



Similar to the last, but more intensely black, the 

 wings dark smoky, decidedly darker at the base ; the 

 tarsi not paler. 



