42 HAUSTELLATA. LEPIDOPTERA. 



of the metropolis, while the true Ph. Quercus of Linnd is but rarely found 

 within that district, although it abounds in the New-forest, in Devonshire, 

 and near Dublin, I am induced to consider them at least as distinct as La. 

 Medicaginis is from La. Trifolii. 



Common in the neighbourhood of London ; especially at Darenth- 

 wood, near Hertford and Ripley ; also near Dover, Hastings, and 

 Brighton. " Epping." — Mr. H, Douhleday. " Not uncommon in 

 Cambridgeshire." — Rev, L. Jenyns. 



Genus LI. — Trichiura * mihi. 



Palpi very minute, concealed by elongate hairs, triarticulate ; basal joint as long 

 as the second, and stouter; terminal joint minute, ovate: inaxiUw obsolete. 

 Antenna' straight, short, bipectinated in the males, serrated in the females : 

 head moderate, densely pilose, distinctly visible from above: thorax stout, 

 pilose: abdomen slender, with an elongate sub-bifid tuft at the apex in the 

 males, very robust in the females, with a dense woolly mass at the tip : wings 

 rounded at the apex, not reversed during repose, abbreviated in both sexes : 

 legs short, stout, densely clothed with elongate hairs to the claws. Larva 

 cylindrical, hairy, solitary : pupa stout, enclosed in an ovate rigid cocoon. 



If the term genus be employed, as it ought, in the sense alluded 

 to in p. 38, doubtless other characters, besides mere outline must 

 be sought for to discriminate the genera of Lepidoptera ; that Tri- 

 chiura offers other distinguishing marks by which it may be divided 

 from Clisiocampa, is very readily shown, and that its habits are 

 totally dissimilar has been known more than a century. The female 

 Trichiura lays her eggs in irregular longitudinal stripes on the bark 

 of trees, covering them with down from the apex of her abdomen. 

 Clisiocampa, on the contrary, deposits them in a solid compact ring, 

 round a slender twig, without any protection : the larvse of Trichiura, 

 when hatched, very speedily separate, and do not form a general 

 nest; whereas those of Clisiocampa form a general web, which they 

 increase in bulk until it becomes nearly as large as a man's head, 

 and do not separate till they have vuidergone their final moult, pre- 

 viously to their change to pupae ; in fact, they are so truly gregarious, 

 that the young larvae almost invariably die if separated from their 

 companions: again, when the larvae of Trichiuraf change to pupae, 



* &i>4 villus, eu^a Cauda. 



f This and the following genera, as well as most of the new genera of Lep. 

 Pomeridiana, employed in this work, were proposed by me upwards of ten years 



