23 



forming the highest subfamily of the Phalosnidce. I am aware that the 

 larva' have sixteen feet, no other Phalsenid having more than fourteen. 



Eyes.- — There are no peculiarities in the eyes sufficiently marked to 

 distinguish the genera and species. They are full, spherical, dotted with 

 flack spots, and provided with scattered, short, minute hairs. 



Ocel/i. — Although it is stated* that the Phal<znid(B have no ocelli, I have 

 found that they generally occur in our species; though, compared with those 

 of the Nod aulas, they are small, and easily overlooked. They are situated 

 very near the eyes, usually on the suture between the epicranium and occiput. 

 They sometimes appear as it actually situated on the occiput, but this is not 

 the case, as their normal site is the posterior edge of the epicranium. 



They are present or absent in different species of the same genus. For 

 example, in Semiothisa quadri-signata they are unusually large and distinct; 

 while, in <S. ocellinata, they are entirely absent. It is a question whether they 

 are ever of use to the insect, as, in most cases, they appear as if partially 

 aborted, and their presence and absence in different species of the same 

 genus shows that they are not very essential to the life of the insect. 



They occur in various degrees of perfection in the following species: 

 Glaucopteryx ctesiata, Plemyria Jluinata, Hydriomena trifasciata, Ochyria 

 designata, Melanippe rvficillatq and hastata, Phibalapteryx intestinata, Eucos- 

 mia undulata, Bapta albooittata, Heterophelps triguttata, Zerene catenaria, 

 Semiothisa quadri-signata, Azelina hubne?wia, Tcphrosia canadaria, Metrocam- 

 pa perlaria, Caripeta divisata, Acidalia quadri-lineata, Eucrostis chloroleucaria, 

 Metanema inatomaria, Endropia hypochraria, Cabcrodes covfusaria and metro- 

 cainparia, Eutrapela transversata, Cydimon Leilus. 



The following species were found to have no ocelli : Eupithecia miseru- 



Ititu, Petrophora prunata and P. diversilineata, Oporinia perlineata, Semiothisa 



ocellinata, Anisopteryx pometaria, Cymtttopltora crepuscularia, Nematocaiupa 



Jilamentaria. 



§5. Comparative Anatomy of the Thorax. 



In studying the anatomy of the thorax of the Phalcenidce, as compared 

 with that of other families of the Lepidoptera, we are baffled by the want of 

 a. comparative knowledge of the parts of the thorax in this and other orders 

 of injects. It is the writer's intention to prepare a work on the comparative 

 external anatomy of insects, and he has collected some materials for the pur- 



*A. GucuJe. rhalcnitcs. 



