176 Mr. R. MacLachlan's Monograph of 



Section I. Tivo sectors in the anterior wings (PI. IX. 

 %. 6). 



1. Hemerobius elegans, Stephens. 



Hemerohius elegans, Steph. 111. vi. 113 (1836). jB". 

 Marsho-mi, Steph. 111. vi. 114 (1836). H. paucinervis, 

 Zett. Ins. Lapp. 1050 (1840). Mucropalpus pygmceus, 

 Ramb. Nevrop. 442 (1842) ; JT. p^^moews, Brauer, Neurop. 

 Aust. 56; Hag. Ent. Ann. 1858, p. 56; Ed. Pict. 

 Nevrop. d'Esp. 56. 



Dark shining piceous, with a few pale golden hairs ; 

 antennce black, with a testaceous basal joint ; front some- 

 times yellowish testaceous ; the whole underside of the 

 head and thorax yellowish. 



Abdomen dull pitchy-brown, with golden hairs. In 

 the $ I can see no superior or lateral appendices, but 

 the last ventral segment is produced in the middle into 

 a short curled-up hairy lobe. 



Legs very pale whitish-yellow ; femora marked with 

 pale fuscous externally. 



Wings short and broad, pale grayish : anterior pair 

 closely spotted with darker gray, and varying according 

 to the extent to which the spots coalesce ; apical and 

 dorsal margins pale and dark gray in alternate spaces ; 

 only two sectors; longitudinal veins with short pale 

 golden hairs, pale fuscous, those of the disk with whitish 

 dotted interruptions ; gradate veinlets dark fuscous, four 

 in the outer series placed in two pairs, five in the inner, 

 one of which is placed between the sector and radius, 

 and the four others together in a line, missing two inter- 

 stices from the first, and a series of three or four others 

 near the base : posterior wings pale grayish, with fuscous 

 veins and smoky pterostigma. 



Length of body 2-2^ lines, expanse of wings 4-6 lines. 



The smallest species ; not generally common, and 

 appears to prefer the neighbourhood of streams and 

 rivers; in summer and autumn. 



This is the only British species with two sectors, and 

 perhaps also the only European, for the Sardinian par- 

 vulus may be only a form of elegans. 



