unusual monstrous Insects. 227 



Zerene adusta. — Dr. Plagen, op. cit. p. 13, records 

 the trausformation of a caterpillar of this species into a 

 chrysalis which still retained the head of the larva. 



BoTYS FUSCALis. — Mr. Staiuton exhibited to the 

 Entomological Society of London a specimen of this 

 moth with the head covered by part of the puparium ; it 

 was flying briskly when captured, the antenna? and haus- 

 tellum were free, and the case of the latter projected 

 downwards, like the rostrum of a Panorpa. 



The deductions of Dr. Ilagen, arising from the con- 

 sideration of the preceding cases, are of considerable 

 physiological importance, to which, however, I have not 

 considered it necessary in this place to do more than 

 allude thus briefly. 



PsYcnoDA AURICULATA. — Mr. CurtIs (Brit. Eut. 

 pi. 745) has represented in his figures of the genus 

 Psychoda certain biarticulate appendages, two of which 

 are attached to the anterior margin of the thorax of 

 certain individuals of that genus. They seem to repre- 

 sent two biarticulated palpi, and were pointed out to him 

 by Mr. Haliday. " They seem," says Mr. Curtis, " to be 

 the analogues of those developed in the pupre (as figured 

 by Bouche, pi. 2, fig. 22), and it may be by accident that 

 they are united to the prothorax or absorbed in their 

 change to the imago, otherwise it would be difficult to 

 explain the reason why they are not common to the 

 genus." 



From this circumstance INIr. Haliday named one species 

 of the genus Psychoda auriculata. 



The following case of the accelerated development of 

 the imago is referred to by Lacordaire amongst his 

 instances of imperfect Ecdysis, resulting from " precocitc 

 de developpement " (op. cit. p. 443): — 



According to Majoli (Giornale di fisica del regno itallco, 

 Pavia, 1803, t. v. p. 399, cited in Meckel's Deutsches 

 Archiv. fur Physiologic, t. ii. p. 542, not quite correctly by 

 Lacordaire, Introd. ii. p. 443, and by Dr. Hagen, from the 

 original in ]\Icm. Mus. Compar. Anat. Harvard Coll. t. ii. 

 No. 9, 1876), the catcr])i]lars of Bomhyx mori are occa- 

 sionally transformed after their fourth moulting without 



