the British Neuroptera-Planipenma. 165 



Genus I. Osmylus, Latreille. 



Head with the vertex inflated; ocelli three, placed 

 closely together; antennce. about one third the length 

 of the wings, the joints ovate ; last joint of the maxillary 

 palpi acuminate, pointed. 



Prothorax much narrower than the head, longer than 

 broad. 



Abdomen moderately robust; in the male, provided 

 with two large ventral valves at the apex. 



Legs slender, cylindrical; ungues simple ; pidvUli large. 



Wings large ; costal veinlets both simple and forked ; 

 costal area narrow at the base ; suh-costa and radius be- 

 coming confluent at the apex ; sub-costal area with one 

 transverse veinlet placed at the base ; first sector starting 

 from near the base of the radius, and emitting several 

 others which mostly become furcate at the margins ; the 

 two cubiti parallel, running close together; the gradate 

 veinlets run in two sub-parallel series, the space between 

 the inner one and the base densely reticulated with nu- 

 merous transverse veinlets, forming almost quadrate cel- 

 lules. In the posterior wings the net- work is more open. 



Larva aquatic. 



1, OSMYLUS PULVICBPHALUS, Scopoli. 



Hemerobius fulvicephalus, Scop. Bnt. Carn. 270 (1763). 

 H. maculatus, Fab. Mant. Ins. i. 247 (1787). Osmylus 

 maculatus, Lat., and other authors. Hemerobius chrysops, 

 Linn. Coll. (but not H. chrysops, Linn. Faun. Suec. 382, 

 according to the description) , Osmylus chrysops, of au- 

 thors. Hemerobius laurifoliceformis, Raz. Hist. Jor. 289 

 (1789). 



Head shining, reddish orange ; eyes, ocelli, and antennce, 

 black, the last with few and short grayish hairs. 



Pro- meso- and meta- thorax blackish fuscous, with yel- 

 lowish markings in the middle. 



Abdomen blackish fuscous, sparingly clothed with 

 grayish hairs. 



Legs pale testaceous, terminal joint of tarsi somewhat 

 fuscous. 



Wioigs hyaline, with blackish fuscous spots, which, in 

 the fore-wings, are large and somewhat quadrate, on the 

 dorsal margin towards the base, and on the costal mar- 

 gin near the apex ; pterostigma marked with pale yellow- 

 ish between the dark spots; veins mostly blackish, a few 



