Genera and Species of Exotic Trichoptera. 263 
Antenne yellow, finely annulated with fuscous at the divisions 
of the joints towards the base; basal joint fuscescent externally. 
Head rich dark brown, with three yellow spots in front. Palpi 
yellow. Prothorax fuscous, somewhat ochraceous. Mesothorax 
black in front, chestnut brown behind. Anterior wings pale 
fuscous, with a brilliant golden reflexion ; two short whitish lines 
at the base, one along the costa, the other in the middle; a broad 
white fascia in the middle, nearly interrupted on the apical side 
by a narrow prolongation of the dark ground colour. Posterior 
wings similar in colour to the anterior; a long white space along 
the costal margin; neuration in all the wings fuscous, except in 
the pale spots, where it is yellow. Legs yellow. Abdomen 
dull ochreous. 
This species somewhat resembles the last, but may be instantly 
separated by the coloration of the body. 
The genus Macronema, as it now stands, may be at once recog- 
nized by the remarkably small discoidal cell of the anterior wings ; 
the neuration does not seem to offer any important variation in 
the numerous species, but I am convinced that much remains to 
be done in the way of subdividing the genus according to the 
number or form of the spurs on the anterior tibiz. This has 
been partially done by Kolenati (Gen. et Spec. Trichop. pt. 2, p. 
239), who forms the genus Macrostemum of a section which he 
says is characterized by the absence of anterior tibial spurs. I 
have lately examined about twenty-seven species with a view to 
ascertain if these could be arranged in any well-defined limits, 
but the results are unsatisfactory, owing to their having been, for 
the most part, obtained from single individuals of each species, in 
some of which the spurs may havé been accidentally broken. 
Moreover, I am sure that in some species the anterior spurs vary 
in the sexes; as examples of this I will cite M/. capensis, Walker, 
and M. fastosa, Walker. Again, some possess two long and equal 
spurs on these tibiae, and others two very unequal spurs ; in some 
there appears to be only one spur, and I think that others will 
surely bear out Kolenati when he denies the existence of any 
anterior spurs; yet appearances are sometimes deceptive, for on 
examining three examples of M. apicalis, Walker, two of them 
certainly appeared to have spurless anterior tibiae, whilst a third 
exhibited two very minute spurs. 
The following notes on the synonymy of this genus may be 
useful :— 
M. albovirens, Walker, and M. agraphum, Kolenati. Both 
VOL. V. THIRD SERIES, PART II.— JUNE, 1866. A 
