180 Mr. R. MacLachlan's Monograph of 



Length of body 2-3 lines; expanse of wings 6|-8 lines. 



Common throughout the summer. 



Var. di .zz-Muoropalpus fuscinervis, of Schneider. 



Differs from the ordinary form, in the body being not 

 yellowish ; the wings with the membrane nearly colour- 

 less, though still highly iridescent ; the pterostigma darker, 

 brown ; the longitudinal veins less clear, the costal vein- 

 lets and sub-costa wholly fuscous; the gradate veinlets 

 in all the wings nearly black, seven in the outer series 

 in the fore- wings. 



Expanse of wings 6| lines ; very uniform in size. 



Less frequent than the type-form. 



Through the kindness of Herr Brauer, I have seen a type 

 of fuscinervis, labelled by Schneider himself. This variety 

 seems to be very constant in its characters, but, save in 

 the colouration of the veins, I can find nothing whereby 

 to separate it specifically ; structurally it seems identical. 



6. Hemerobius humuli, Linne. 



Hemerohius humuli, Linn. Faun. Suec. 383 (1761), 

 Syst. Nat. i. 912 ; and other authors. H. lutescens, Steph. 

 111. vi. 109 (not of Fab.) . H. affinis, Steph. I. c. (1836). 

 H.pagamts, Steph. 111. vi. 110 (not of Linne). H. api- 

 calis, Steph. I. c. H. maculatus, Wesm. Bull. Acad. Brux. 

 1840, p. 215. 



Pale yellow, the sides of the prothorax fuscous ; face 

 yellow; last joint of ^jaZpi fuscescent. 



Abdomen pale yellow, with pale hairs. In the (^ , the 

 appendices are broad, furcate at the apex; the prongs 

 nearly equal and divergent, hairy, yellow ; a callosity at 

 the base (Pi. X. fig. 5a) . 



Legs pale yellow. 



Wings elongate, hyaline, beautifully iridescent, scarcely 

 tinged; anterior pair more or less clouded with gray, the 

 apical and dorsal margins blotched with gray ; usually 

 with a small distinct black spot between the cubiti near 

 the base; neuration (PL X. fig. 5) pale, with few black 

 dots, which are raost evident at the axillae of the furca- 

 tions; gradate veinlets brown, about seven in the outer 

 series, and six in the inner, one or two near the base ; 

 three sectors : posterior pair hyaline, unspotted. 



Length of body 2j-3^ lines; expanse of wings 6^-9 

 lines. 



