PRORIFRONS. By Dr. M. Draudt. 
571 
post-median area against the subterminal area much more distinct, blackish and particularly in the upper half 
much more strongly dentate with distally projecting round bows; subterminal markings almost as in tremula. 
Colombia. Type (<$) in the Coll. Bang-Haas. 
P. prosper Dyar (78 d) is quite an uncommon variable insect, very similar to tremula, somewhat prosper. 
smaller, in the form which I consider to be the type light red-brown, before and behind the median area very 
much mixed with yellow, the subbasal line shaped as in tremula, the median area at the costal margin more 
than twice as broad as at the hind-margin, between 8 and 9 distally four times as broad and here very denticulate, 
towards the hind-margin in the centre of a very light yellowish-white; discal dot very small, on the proximal 
border of the median area; on the border between the postmedian area and the decidedly yellow subterminal 
area there is an intense double red-brown waved line filled with light; marginal area reddish-grey, subanally 
and between 4 and 6 extending notched into the yellow subterminal area; the row of black dots is complete, 
the two anal ones and apical ones being the largest. Hindwing brownish-red, fringes with whitish tips. The 
$(77 d) of which we are able to figure the type is compared with conradti by the author, but it seems not to 
have been the genuine conradti. Dyar writes that prosper has much narrower wings, the hindwing being less 
deeply concave at the costal margin; the markings are much more distinct without the faded yellowish areas; 
body beneath not so dark blackish-brown, the subterminal spots more irregularly arranged. Mexico. — pini pini. 
f. n. (78 d) I denominate an extremely grey-dusted form, only the subterminal area being yellowish reddish, 
the total colouring being softer, smoother, all the lines somewhat finer, the black discal patch feebler; thereby 
a remarkable resemblance to certain D. pini from Europe is produced. The genital organ is quite the same in 
both forms: at the penis between the main and the vesical spine a concavity exhibiting like a comb 4 more, 
slightly curved parallel spines gradually decreasing in size towards the main spine; the vesical edge of the 
accessory spine exhibits on a slight convexity 4 more, smaller spines, so that this insect shows an extraordinarily 
complicated spining which cannot be mistaken for any other species known to me. Mexico (Orizaba; Cordoba), 
type in the Coll. Draudt. 
P. costaricensis sp. n. (77 d) is the most similar to prosper in the genital organ, but very different in costaricen- 
the exterior; much smaller and of an almost monotonous greyish-brown ground-colour, lighter than in mulleri, 
all the lines, as well as the border of the median area, indistinct, shadow-like, the subbasal line shaped as 
in tremula, the median area relatively very narrow, in one of the two specimens at hand only few millimeters 
broad, the white discal spot almost extinct, particularly the distal border-line very undulatingly dentate, still 
more so the postmedian border-line which is distally bordered by a light line; the small blackish subterminal 
spots are very feeble, hardly shadoAV-like. Hindwing somewhat darker, more intensely coppery, the ends of 
the fringes whitish. According to 2 <$<$ from Costa Rica in the Coll. Bang-Haas. — seitzi /. n. (78 e) is specifically seiizi. 
not separable owing to the genital organ, but it looks quite different and is very similar to prosper by the 
bright red-brown colour which is more rusty yellow basally and behind the median area; in the marking 
otherwise the same, the median area is somewhat broader, the white discal spot stronger, the contrast between 
the rusty yellow subterminal area and the greyish-brown marginal area much more prominent, the small black 
spots stronger. According to 1 $ from Gramal near Muzo (Colombia); type in the Mus. Senckenberg. The 
penis is not dissimilar to that of prosper, but much smaller and neater, the concavity between the spines very 
much deeper containing but 2 very feeble small spines, at the upper edge of the vesical convexity with 2 
somewhat larger dents, below them with 3 tiny dents. 
P. vibrans Schs. (77 c, 86 a) is very similar, smaller, the median band narrower, distinctly darker, vibrans. 
the transverse lines at the costal margin more distinctly denticulate, lighter, more distinctly bordered with 
dark, the median area above the hindmarginal vein on both sides convex, the subterminal spots distinct, 
roundish, more or less completely centred with blackish. Hindwing dark copper-brown. Costa Rica. 
P. conradti Drc. (77 d) is one of the largest species; reddish-brown, all the transverse lines finely conradti. 
undulatingly dentate, the median area particularly at the costal margin broad, at the hind-margin narrower, 
distinctly dark brown or blackish-brown, the white discal dot on the proximal border, the blackish discal 
longitudinal stripe narrow; subterminal line not broken up into dots but forming a yellowish-ochreous band 
which is proximally indistinctly, distally distinctly defined, enclosing small black spots, only the anal ones 
of which are more distinct, the upper spot receding far; between the median area and the subterminal band 
there are besides two undulating darker brown lines; marginal area somewhat greyer, projecting in the centre 
between 4 and 6. Hindwing red-brown with distally whitish fringes, the light transverse lines very distinct. 
Air. Tams had the kindness to send me a photo of the genital organ of the type which has apparently remained 
unique. Accordingly, the penis which is very characteristical for every species exhibits, at the proximal end 
opposite the vesica, as in all the Prorifrons, a very strong spine-like appendage with a single shorter accessory 
spine in the centre of one edge. Described from Guatemala. From the Coll. Bang-Haas I have a much flown 
specimen at hand from Marcapata, which is very much like the figure of the type, but without examining the 
genital organ nothing can be said in this most difficult group. 
