488. 



LIMNEPHILUS ELEGANS. 



The elegant Grannom or May-fly. 



Order Trichoptera. Fam. Phryganiclae. 

 Type of the Genus, Phryganea grisea Linn. 



LiMNEPHiLus Lea., Sam., Curt. — Phryganea Linn., Fab., Lat. 



Antenna; inserted close to the interior margin of the eyes, but 

 remote from the mouth, shorter than the wings, slender, scti- 

 ceous and pubescent, composed of numerous joints, the Lasal 

 one stout ovate and hairy, 2nd cup-shaped, 3rd oblong, longer 

 than the following, which are quadrate gradually becoming ob- 

 long towards the apex, the terminal joint elongate-conic (1). 

 Labrum (2) resting in a groove in the labium, tongue-shaped, 

 hairy, dilated, convex and orbicular at the base. 

 Mandibles very minute. 



Maxilla small, terminated by an obcordate lobe, hairy on the 

 outside (4. m). Palpi shorter than the thorax, and- 5-jointed, 

 pubescent and slightly pilose, basal joint short and oblong, the 

 remainder slightly attenuated, long and of equal length, except 

 the 4th, which is considerably shorter (4). 



Mentum transverse, short, concave before, the anterior angles 



dilated and rounded. Lip nutant, long, fleshy and conical. Palpi 



attached to very short scapes, approximating at the base, triarti- 



culate, 1st and 2nd joints hairy, of equal length, subovate, the 



latter the slenderer, 3rd considerably longer, as broad as the 1st 



and elliptical (5). 



Head small, transverse : eyes lateral very prominent and globose : 



ocelli 2, placed on the crown of the head near to the eyes. Thorax 



small subglobose. Abdomen rather compressed in the male, longer 



and stouter in the female. Wings, superior deflexed when at rest, 



long and narroiv, pubescent, and slightly coriaceous tvith numerous 



longitudinal hairy nervures and an irregular line of transverse ones 



beyond the middle with an elongated stigmatic cell (9) : inferior rather 



shorter than the others but very ample, folded ivhen at rest, very 



delicate, with numerous longitudinal cells, many of them united by 



transverse nervures. Legs, excepting the thighs, bristly : coxae long : 



thighs slender : tibiae simple, posterior with a pair of spurs at and 



another pair above the apex : tarsi 5-jointed, basal joint the longest: 



claws and pulvilli minute. Larvae inhabiting the water and living in 



cases formed of sand, shells, pebbles, bits of wood, grass or straw and 



leaves of plants; the head and 3 frst segments horny, ivith 6 rather 



long pectoral legs, 4th segment with 2 or 3 tubercles, the apical joint 



furnished with 2 claws. Vn])?e, formed in the same case. 



Elegans Curt. Guide, Gen. 748. 17^ 



Palpi and antennae ferruginous; head and thorax somewhat 

 castaneous, the crown of the former and the back of the latter 

 lead colour ; abdomen ochreous, the back fuscous with whitish 

 margins to the segments. Wings shining, superior pale brown, 

 the nervures darker, with the 3rd cell, a stripe on the disc, the 

 1st, 2nd, 4th and 5th posterior cells and a spot at the base of 

 the 3rd and 6th whitish, the superior discoidal cell very long. 



