288 NOTODONTINA 



6. POLYPLOCIDAE. 



Head densely rough -haii-ed. Ocelli present. Tongue de- 

 veloped. Labial pal}n moderately long, subascending, rough- 

 scaled, terminal joint cylindrical. Thorax densely hairy 

 beneath. Femora and tibiae densely hairy, spurs rather 

 short. Forewings : lb sometimes simple, 10 connected by 

 bar with 9. Hindwings : 5 fully developed, 6 from angle, 

 7 from upper margin at |, 8 closely approximated to 7 

 beyond cell. 



Only a small group, nor is there any evidence that it has 

 ever been much more extensive ; it is mainly restricted to the 

 northern hemisphere. The imagos have mostly stout bodies 

 and elongate -triangular forewings, and have some superficial 

 resemblance in form with the Garadrinidae, with which how- 

 ever there is absolutely no relationship. The similarity of the 

 neuration of the hindwings to that of some Lasiocampina is 

 probably reversional. 



Ovum spheroidal above, flattened beneath, surface finely 

 reticulated and sometimes ribbed. Larva moderately stout, 

 with all prolegs developed. Pupa in a rather slight cocoon 

 usually amongst leaves. 



Occasionally in the forewings, by obsolescence of a small 

 connecting portion of the vein, 9 appears to rise out of 10 and 

 have no connection with 8 ; or possibly this may be its true 

 original structure. 



The phylogeny of the genera, which are all nearly related 

 togethei", is probably fairly indicated by the arrangement. 



Tabulation of Genera. 



1. Eyes hairy . . . .4. Polyploca. 



„ glabrous . . . . .2. 



2. Hindwings with .5 parallel to 4 . 3. Palimpsestis. 



,, ,, approximated to 4 at base . 3. 



3. Antennae in S ciliated with fascicles . 2. Thyatira. 



„ „ simple . . .1. Habrosyne. 



1. Habrosyne, Hb. 



Eyes glabrous. Antennae in $ filiform, simple. Thox'ax 

 ti'ansversely crested. Abdomen with small dorsal crest. Fore- 

 wings : 6 out of 9. Hindwings : 5 approximated to 4 at base. 



A small genus, distributed throughout the nortliern hemi- 

 sphere. 



