174 Mr. R. MacLachlan's Monograph of 



Abdomen pale at the apex, strongly ciliated ; the ventral 

 lobe of the male large, very concave, the appendices lying 

 therein are long, extending much beyond the lobe, and 

 curved strongly downwards. (PL IX. fig. 4 a, 4 &) . 



Length of body 3-4 lines, expanse of wings 8-9 lines. 



A common species throughout the summer. {Heme- 

 robhis decussatus of Leach and Samouelle should be re- 

 ferred here.) 



Genus V. Hemerobius, Linne. 



Ocelli absent ; antennce shorter than the wings, the 

 joints mostly rounded, strongly setose; last joint of the 

 TYiaxillary palpi not greatly longer than the penultimate, 

 rather suddenly drawn into a long slender point at the 

 apex. 



Prothorax short, transverse. 



Abdomen short ; the male usually provided with a pair 

 of appendices, which are frequently furcate ; the apex 

 usually obtuse in the female, but sometimes with a visible 

 borer. 



Legs slender; tibice usually somewhat dilated and 

 compressed, attenuated at each end, occasionally cylindri- 

 cal ; ungues simple ; indvilli usually moderately large. 



Wings ovate, strongly obtuse, the posterior pair nar- 

 rower ; the margins and veins strongly ciliated. Ante- 

 rior wings with the costal area broad, strongly dilated 

 at the base, the veinlets furcate, the first veinlet from 

 the base does not reach the margin, but is directed 

 back to the extreme base, forming a free cellule (PI. IX. 

 fig. 6 ; PI. X. figs. 1, 5, 10, indicated at a) , and emitting 

 several short branches to the margin ; sub-costa and 

 radius separated to the apex ; sub-costal area narrow, 

 with one transverse veinlet near the base, and usually 

 another near the apex ; one to four (exceptionally five) 

 sectors all starting from the radius, and running parallel 

 into the margins, where they are twice or thrice forked : 

 usually in each marginal space, between the veins, there 

 is a small rudimentary, and scarcely evident, veinlet; 

 gradate veinlets in two somewhat parallel series, whereof 

 the inner is nearer to the apex than to the base ; ptero- 

 stigmatical region indistinct, filled in with very numerous 

 oblique veinlets ; in the posterior wings the gradate vein- 

 lets are less numerous. 



