griseci. 
amcricana 
622 HYPOPACHA; MALACOSOMA. By Dr. H. G. DyAR. 
21. Genus: Hypopsicha N. & D. 
This North-American genus contains but one small species forming the transition between the Euglyphis 
and the following Malacosoma. Shape of wings broad, costal margin straight, distal margin of hindwing rounded; 
antennae of half the length of the costal margin, not very long combed, in the $ serrate. 
Type: H. grisea Neum. 
H. grisea Neum,. (86 a). Grey, strewn with a darker colour, with thick blackish-grey transverse strijDes 
which are irregularly dentate, the anterior one double, the posterior one double only below the costal margin, 
both filled with light; the subterminal line recedes discally in an angle and is inwards bordered with a somewhat 
lighter colour. Hindwing and abdomen lighter. Apparently very rare, from Arizona. 
22. Genus: Malacosoimi Hbn. 
The American representatives of this genus having been dealt with at large already in Vol. II, p. 150, 
by Dr. Iv. Grunberg, offer such uncommon difficulties that we feel infinitely obliged to Dr. H. G. Dyar for 
having complied with our request to overtake the elaboration of these species. They are likewise chiefly middle- 
sized forms with variably brown and yellow tints, with mostly 2 light or dark transverse stripes on the forewings. 
Like the North-American Tolype, these insects also exhibit so great an individual variability whilst being 
evidently very closely allied that their delimitation is almost impossible for those not being well versed in the 
matter. Therefore the tx’ial has been made to facilitate the determination by an analytical table, though for 
the reasons mentioned above it can only be regarded as a general and summary sketch. The anatomical and 
biological conditions of the species are entirely the same as those described in the Palaearctic Volume, so that 
we need not enlarge upon this matter here. 
Type: M. franconica Esp. (palaearctic). 
Analytical table of species. 
I. Fore wing crossed by light lines, at least in the male. 
A. Reddish brown, sexes similar, white lines of forewing straight, rather broad or shaded americana Harr. 
B. Dark brown, sexes similar, white lines of forewing narrow, more or less crenulate fragilis f. ctzteca Neum. 
C. Variable; pale lines yellowish in male, often with dark edges, more or less crenu¬ 
late; female paler, more or less suffused with luteous 
a. Grey-brown; female of the same shade but paler 
b. Male bright red-brown, female yellow or brown suffused 
II. Fore wing crossed by dark lines in both sexes. 
A. Male pale yellow, female dark brown 
B. Male and female both pale yellow; lines more or less brown shaded between 
C. Sexes similar, not pale yellow 
a. Brown lines of forewing distinct and rather broad 
a Apex of forewing round; lines non-crenulate 
/? Apex of forewing acute; lines somewhat crenulate 
b. Brown lines narrow or obsolete, more or less crenulate 
a “ Male dark brown, female yellow piuvialis f. recenseo Dyar 
/? “ Male yellow, female darker tigris Dyar 
y “ Male clay-color with the dark lines distinct but narrow texana Beutenm. 
M. americana Harr. (= decipiens Whr.. frutetorum Bsdv.) (86 a). Sexes similar, soft red-brown, the 
lines of forewing white, broad, often shaded whitish between in the male. Larva with narrow whitish dorsal 
stripe edged with orange streaks, and blue spots on the sides, on wild cherry and apple. The larvae spin a large 
communal nest in the forks of twigs in the spring. This is the ,,American text caterpillar”. Northern Atlantic 
States. 
fragilis Stretch, 
piuvialis Dyar 
californica Pack, 
ambisimilis Dyar 
constricta Stretch, 
luteimargo Dyar 
disstria Hbn. 
onissa, Dyar 
disstria. M. disstria Hbn. (= drupacearum Bsdv., sylvatica Harr., thoracicoides N. & D., erosa Stretch, sylva- 
ticoides N. cb D., thoracica Stretch, perversa N . & D., astriata Beiff, anita Beiff) (86 a). Brown and yellow, with 
dark lines on forewing, very variable; the various varietal names proposed are superfluous, referring to indvidual 
