14 - NEUROPTERA. 
brownish spot extending its whole length. The joinings of the ventral segments, as 
well as the lateral margins of the second to the eighth segments, are narrowly pitch- 
brown ; the lateral borders of the ninth segment broadly so. Forceps brownish in the 
first and second joints, pitch-black in the third and fourth. Sete pitch-brown, with 
the basal part of a joint here and there whitish, viz.:—counting from the roots, the 
base of the fifth joint narrowly whitish ; one third of the seventh joint whitish ; more 
of the ninth joint whitish ; then for some distance until nearly the end of the seta 
about half of every fourth joint whitish ; and then the whitish markings are reduced 
in width and soon finally disappear. Wings nearly as in the type, but the marginal 
and submarginal areas of the fore wing each contain two small fuscescent clouds 
before the bulla. The band near the middle of the fore femur is indistinct. 
The ? imago resembles the ¢ in many respects; but while the greater part of the 
neuration of the wing is pitch-black, the subcosta and radius are mostly pitch-brown, 
and neither the extreme base of the wing nor the cross-veinlets are clouded or bordered 
with fuscescent. , 
Length of body 8-9; wing 10-11°5; setw, ¢ imag. about 27, subimag. 20, 2 imag. 
about 25 millim. 
Three other species of Baétis, more nearly related than B. salvini to the European 
forms, are represented in the collection referred to; but for reasons above stated it 
seems inexpedient to name any of them. It will suffice to catalogue them with record 
of localities. 
Baétis —— ? 
Hab. Mexico, Orizaba (H. H. Smith; one 2 subimag.). 
Baetis —— ? 
Hab. Mexico, N. Sonora (Morrison ; eight 2, two ¢ subimag., one ¢ and one 9 
imag.). 
Bacetis ——? 
Hab. Mexico, N. Sonora (Morrison; eight 3, seven ? subimag., seventeen 3,two 2 
imag.). 
CENTROPTILUM. 
Centroptilum, Eaton, Ent. Monthly Mag. vi. p. 132 (1869); Rev. Mon. Ephem. p. 174, t. 17. 
figg. 30 a-c (adult details) and t. 46 (aymph) (1884-5). 
A comparatively small genus, widely distributed in Europe and North America, and 
recorded from Cuba. 
