14 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxi. 



OB the thorax. Primaries broadly trigoiiate,the outer margin oblique, 

 the apex considerably produced, so that the costa is almost double the 

 length of the inner margin. The venation is normal, except for the 

 origin of the veins from the accessory cell. This latter may be entirely 

 absent and is never well developed; but hardly two of my specimens 

 are entirely alike. The only permanent feature is that veins 7 to 10, 

 inclusive, always rise from this point, though 7 may be stalked with 

 8 + 9, or 8 + 9 may be stalked with 10. Sometimes all rise from one 

 point, and again 7, 8+ 9, and 10 may be entirely distinct. 



The secondaries are proportionate, well developed, with vein 5 as 

 strong as the others and usually close to 4, so as to form part ot the 

 same series. This is not entirely uniform, however, and 5 may be quite 

 well removed from 4, though always of full strength. 



Three of the species agree in genitalic characters, the harpes being 

 broad, somewhat irregular, and with a small, very stout, obtuse, curved, 

 corneous clasper, at the lower angle of the tip. The odd species is 

 gigantea, which has a very large, broad, corneous clasper, which is scoop 

 shaped, quite abruptly bent and pointed at the tip. 



The species agree closely in general type of maculation, all having 

 the ordinary lines and the median shade a single, broad, black band, 

 while the subterminal line is marked by a broad, black, dentate pre- 

 ceding shade. All are ashen gray or black powdered on a white ground. 



Fnrcilla differs at once from all the others by lacking all trace of tlie 

 ordinary spots. The lines are even, quite well defined, and the median 

 line as a rule touches and for a short distance unites with the trans- 

 verse posterior. 



Gigantea has the reniform present and is at once the largest and 

 darkest of the species. The primaries seem almost blackish, the tho- 

 racic markings are practically obscured by the powderings, and the 

 transverse lines on the primaries are quite narrow and even. 



Portlandia is Almost white in ground color and only a little powdery. 

 The reniform is distinct, a little diffuse, and the transverse lines also, 

 while distinct, have the margins i)ow(lery and somewhat dififuse. All 

 the lines are entirely separated in all the specimens under examination. 



Acronyctoides is the smallest of the species, and in all the specimens 

 I have seen the orbicular is present as a black spot. There is a dark 

 shade between the median and transverse posterior lines which gives 

 a broad, band-like effect below the middle, and the subterminal space 

 is almost entirely dark filled. 



The species are thus all distinct and may be arranged in tabular 

 form as follows: 



ANALYTICAL KEY TO THE SPECIES OF PANTHEA. 



Ordinary spots of primaries entirely wanting. 



The ordinary lines and median shade are prominent, broad, and hlack.. fnrcilla. 

 Ordinary spots represented by the reniform. 



Very dark, powdery gray, with the black transverse lines even and narrow. 



gigantea. 



