108 Mr. R. M‘Lachlan’s Monograph of the 
appears probable that this form is Mystacides tinedides of Brauer, 
as a specimen from Professor Zeller’s Collection is so labelled. 
8. Leptocerus dissimilis, Stephens. (PI. XII. fig. 20, app.) 
Leptocerus dissimilis, Steph. (*) Hl. p. 197, 10 (1836); Hag. (*) 
Ent. Ann. 1860, p. 72, 64; JL. assimilis, Steph. (*) Ill. p. 
198, 14 (1836); Mystacida vetula, Ramb. Hist. Nat. Névrop. 
p- 512, 12 (1842)?; Mystacides fennicus, Kol. Gen. et Spec. 
Trichop. p. 252, 4, pl. 3, fig. 25 (1859) ? 
Antenne dark brown, annulated throughout with white. Palpi 
greyish-brown. Head clothed with pale greyish-white hairs. 
Mesothorax testaceous. Anterior wings brown, darkest towards 
the apex ; a yellowish spot at the arculus (most conspicuous in 
the living insect with the wings closed); fringes dark brown, 
becoming blackish-brown at the anal angle. Posterior wings 
greyish subhyaline, with grey fringes. Legs white, the tarsi 
annulated with brown. Abdomen brown, greenish beneath in the 
female, with whitish lateral lines. From the middle of the upper 
margin of the last abdominal segment in the male there proceeds 
a triangular lobe, the apex of which is produced; beneath this 
lobe on either side are two broad pieces (app. sup.?), much 
rounded on the external edge and nearly parallel on the internal, 
their apices produced into a fine point ; beneath there is a broadly 
oval and obtuse upper penis-cover, in which lies the small penis 
(visible only from beneath); app. inf. large, furcate, the forks 
widely divaricating, the lower branch longest and thinnest, the 
upper minutely toothed towards the apex. 
Expanse of fore-wings 6—9 lines. The females considerably 
smaller than the males. 
Occurs in summer about slowly-flowing rivers in many places; 
not uncommon near Kingston-on-Thames ; abundant at Ringwood ; 
Killarney, in Ireland. 
9. Leptocerus bifasciatus, Olivier. (PI. XII. figs. 21, 22, app.) 
Phryganea bifasciata, Oliv. Enecye, Méthod. vol. vi. p. 558, 20 
(1791); Aystacides bifasciata, Pict. (*) Recherch. p. 166, 5, 
pl. 12, fig. 3; Brauer, Neurop. Aust. p. 41; Leptocerus bi- 
fasciatus, Hag. (*) Ent. Ann. 1860, p. 73, 69; L. affinis, 
Steph. (*) Ill. p. 198, 13 (1836); Mystacides affinis, Kol. 
Gen. et Spec. Trichop. pt. 2, p. 258, 11, pl. 3, fig. 30. 
Antenne black, the basal half conspicuously annulated with 
