ISANTHRENE. By Dr. M. Draudt. 
47 
subdorsal and lateral yellow spots on the 4 first segments. The pair on the first ring, often also the one on 
the second, are connected. Forehips of the white, of the $ yellow. From Costa Rica, Panama, Colombia, 
and Venezuela. — The specimens from the latter country, to be separated as venezuelana Stgr. (i. 1.) (91 ), venezuelana. 
differ by the black being increased, whereby, particularly at the proximal margins, the yellow is pushed back; 
the antennae are black to beyond the middle, only the tips are red, and on the legs the tarsi likewise turn black. 
I. thyestes Druce (9 1) is easily recognizable by the yellow abdomen being scarlet at the apex and provided thyestes. 
only with narrow black ring-indentations. Legs, antennae and venter are scarlet, only the tarsi are black; 
forehips yellow. Only from Ecuador. 
I. cajetani Rothsch. (10 a). This magnificent large species approximates thyestes and differs particularly cajetani. 
by the absence of the red of the abdominal apex. The legs are blackish brown, forehips white; palpi black; 
head golden-yellow; the antennae scarlet, at the tips orange-yellow; collar and shoulder-covers golden-yellow 
with black margins; thorax golden-yellow, black-banded. The golden-yellow abdomen black-curled, the last 
segment black with subdorsal yellow spots. The intensely yellow hyaline wings exhibit a black distal margin 
growing very much broader from the lower radial vein towards the apex; the basal 4 / 5 of the costal margin 
are golden orange, the proximal margin black with orange-yellow stripes. 3 from Central America (?), Coll. 
Felder (Tring). 
1. ustrina Hbn. (10 a). The body is black, on the shoulder-covers and metathorax spotted yellow; ustrina. 
antennae quite black, tibiae and tarsi carmine, hips in the $ white, in the $ black. On the two first abdominal 
rings 2 pair of yellow spots, behind them subdorsal and sublateral rows. Wings hyaline, veins, margins, a spot 
at the transverse vein and a large apical spot black. Expanse of wings: ^ 50, $ 60 mm. Cuba; Brazil (Sao 
Paulo). 
I. melas Cr. (= flavicornis F., vespoides Wkr.) (9 m) approximates incendiaria (10 a), the antennae, melas. 
however, are more extensively red, head and thorax are more intensely marked in yellow, and the 4 first abdo¬ 
minal rings exhibit larger yellow spots. The black legs are yellow-striped. Found from Surinam to Paraguay. 
I. pyrocera Hmps. (= incendiaria Druce) (9 m) entirely resembles perbosci, the antennae, however, pyrocera. 
are brighter red-yellow, the thorax is much more marked yellow, and the abdomen exhibits 4 pair of large 
yellow spots, in the $ 5. From Mexico and Ecuador. 
I, perbosci Guer. (= pompiloides Wkr.) (9 m). A very large, strong species with orange-yelloAv antennae, perbosci. 
Body and legs jet-black with a varying number of lemon-coloured subdorsal spots on the abdomen; also the 
shoulder-covers and the collar frequently show yellow spots. Wings yellowish hyaline with black veins and 
margins. At the base and costal margin the brightly brownish-red colour of the under surface shows through. 
Proximal margin of the hindwing broadly black. The forehips in the J are snow-white, in the $ black. In 
Mexico and Guatemala apparently not rare. — Usually only the first abdominal ring shows yellow spots, there 
occur, however, as much as 5 and even 6 dorsal spots (= maculata form, nov.) (9 m). maculaia. 
I. championi Druce (9 m) is a gigantic species very well recognizable by its jet-black body and bright championi. 
brown-yellow wings. The antennae are orange-red; the abdomen exhibits on the first segment two little con¬ 
spicuous, yellow, small spots. The middle segments are white-spotted on the ventral side. The margins of 
the wings are very fine black, the inner-marginal half of the hindwing more extensively black. Beneath, 
the costa and veins of all the wings are scarlet. From Panama (Bugaba, Chiriqui). 
I. echemon Druce (10 b) greatly resembles the preceding, on an average smaller, the abdomen unspotted, echemon. 
unicolorously black. The main difference is the black distal margin of the forewing growing broader towards 
the apex and being entirely absent in championi. Guatemala. 
I. incendiaria Hbn. (10 a) greatly resembles perbosci, but it is easily discernible by the antennae being incendiaria. 
black, only at the tips orange-yellow. The spots on the first 4 abdominal rings are more lemon-coloured, not 
so orange-yellow, the first segments exhibit also laterally yellow spots beside the subdorsal ones. — The form 
in which there are yellow spots only on the first 3 abdominal segments has been denominated maxima Btlr. — maxima. 
Both the forms fly in Brazil (Rio de Janeiro, Espiritu Santo). 
I. tryhanei Rothsch. (10 b). Head and palpi black, on the forehead a yellow spot; thorax velvety- tryhanei. 
black; abdomen velvety-black, the dorsum of each segment exhibits a steel-blue spot, the 3 last rings quite 
steel-blue; on the first segment yellow subdorsal spots, on the second yellow lateral streak-spots. The legs 
and forehips are black, half of the femora red, anterior and middle tibiae red, hind tibiae red-speckled, tarsi 
black. Antennae red. Wings yellow hyaline, the basal two thirds of the costal margin orange, the proximal 
margin broadly black; the black distal margin expands, from the lower radial vein, to a large apical spot. 
Proximal margin of the hindwing black. 1 $ from Trinidad. 
I. Columbiana Rothsch. (10 b) from Bogota (Colombia) differs from the preceding species by considerably columbiana. 
broader forewings which are less intensely yellow, and by quite unicolorously black legs; besides almost the 
whole costal margin and the basal half of the proximal margin are orange yellow. 
