184 [August, 



NOTES OX CERTAIN PAL.EARCTIC SPECIES OF THE GENUS 

 EEMEROBIUS. 



No. 4>—n. NITIDULUS and H. MIC AN S. 



BY ROBERT McLACHLAN, F.R.S., &c. 



We deal here with two nearly unicolorous species, practictally 

 without wing-markings other than the dark points or lines on the 

 neuration. 



They agree also in having the second " post-costal " cellule in the 

 anterior wings ojjen. This is so far constant that in 50 examples o£ 

 micans examined there is no exception, and out of 48 examples of 

 nitidulus in one only is this cellule closed (and symmetrically). 



Both species have rather broad-oval wings. They differ greatly 

 in the ^ appendages, and also in general appearance. They differ 

 also in habits : nitidulus is apparently confined to Conifei's ; micans 

 usually occurs on deciduous trees and shrubs, and even herbaceous 

 plants. 



H. NITIDULUS, Fab. (1777), Hagen, McLach., Wallengr., Rostock, 

 Renter, &c. 

 ochraceus, Wesmael, Brauer. 

 humuli, Zett., sec. Wallengr., nee L. 

 ohscurus, Rambur. 



Yarying from reddish-ochreous to reddish-brown or fuscescent (immature ex- 

 amples much paler) ; the face usually shining piceous. Antennae yellowish, distinctly 

 annulated with brownish or blackish (or vice versa). Legs dingy yellowish, tlie tarsi 

 darker at the tips of the joints. Abdomen fuscescent (often ochreous) in the dry 

 insect. Anterior wings more or less pale greyish-fuscous (varying to yellowish), 

 iridescent, the costal nervules and longitudinal nervures with closely-placed dark 

 tuberculate points, from each of which a blackish hair arises (frequently four sectors 

 in the larger examples) ; pterostigraatic region obscurely reddish. Posterior wings 

 paler, more iridescent, the dark points on the neuration confined to the costal region ; 

 pteroatigmatic region usually longer and more opaque. Expanse, 13 — 16 mm. 



In the cJ the appendages are yellowish, densely 

 clothed and fringed with strong brownish hairs, each 

 arising from a minute tubercle ; they are broad, and 

 the apex is broadly and rather shallowly furcate, the 

 branches somewhat divergent ; the upper shorter 

 than the lower, ending in a very acute inturiied 

 point ; the lower also inturned but the apex is broad 

 (probably truncate if viewed internally, but difBcuIt 

 to define on account of the hairs), this lower branch 

 is deeply concave within. 



Probably spread over tlie greater part 



