128 DESCRIPTIVE CATALOGUE. 



the form and covering of the larva resemble those of Pieris ; but now we have the first indication 

 of the osmaterium or of that retractile, bifid organ which characterises the typical group of 

 this stirps. Doritis, Thais, and the allied genera require however further examination ; and 

 this statement also requires the comparative illustration afforded by the perfect insect. 



In following the series we have now arrived at the genus Papilio constituting a very extensive 

 wroup, the individuals of which have not as yet been arranged accordingly to their true affinities. 

 The metamorphosis in the Javanese and Indian series, in our collection, exhibits the following forms. 

 First : a perfectly smooth larva, with nearly uniform surface, considerably distended about the fourth 

 or fifth segment of the body, with an elevated arched back from which it tapers rather abruptly to the 

 head and more gradually towards the anal extremity. Two examples of this form are contained in 

 the Javanese series : see PI. iii. fig. 5 PI. iv. fig. 12. Secondly : a larva agreeing with the former in 

 outline of form, but being thicker, of a sluggish habit and marked anteriorly with a large clypeus or 

 shield, extending from the arched dorsal elevation to the head. It appears to be peculiar to tro- 

 pical climates and is found on both Continents; in the East-Indies it appears to be comparatively 

 abundant and four different modifications are represented from Java. The work of Smith and 

 Abbot exhibits several American forms of it. Thirdly : an elongated, cylindrical, comparatively 

 thick larva, very slightly attenuated at the extremities, with a smooth surface, from which naked 

 fleshy tubercles arise, varying in thickness and length in different species. Of this we have two 

 examples from Java, exhibited in the ITth fig. of the iii. and in the I3th of the iv. plate. Besides 

 these I am enabled to give a third Indian example of the third group, which was liberally commu- 

 nicated to me by General Hardwicke ; it is represented in the 1st fig. of the viii. plate. The indi- 

 cation which this larva affords of the gradual passage towards the Chilopodiform stirps has already 

 been indicated on the 41st page of the introduction ; and the details of the gradual variation of 

 form as they show the proximity of the next stirps, will be given in the sequel. The most striking 

 peculiarities of the pupa and of the perfect insect have been detailed in the introduction, p. 42, 

 43, 44 ; and on the Synoptic table ; the more minute modifications of form are given in the generic 

 characters. The subdivision of this stirps into families is reserved for another occasion. 



Genus COLIAS. 



Colias. Fab. Latr. Ochsenh. Curtis, Stephens, ^c. Papilionis — Danaorum candidorum species. 

 Linn. Papiliones : Danai flavi. Fam. E. Larvae pallidiventres. Wiener Verzeichnis, 164. 

 Clouded yellows. Haworlh. 

 Character. Larva cylindrica, gracilis, iitrinque attenuata, obsolete transversim scutata, punctis 

 elevatis, minutis tenuiter annulata, rarius subtomentosa, lateribus striga laetiore ornatis : capite 

 parvo rotundato, (Tab. iii. fig. 14, Tab. iv. fig. 6. 7.) 

 Chrysalis glabra, subcompressa, obtuse angulata, supra carinata, medio subarcuata, antice mu- 

 crone solitario definita ; abdomine attenuato arete adnexo, filo raediano laxo recte aut hori- 

 zontaliter suspensa. (Tab. i v. fig. 6, a; 7, a.) 

 Imago : Antenna mediocres, validse, abruple truncates : in sectione prima de basi ad apicem sensim 



incrassatse; in altera ultra medium filiformem in capitulum elongato-obconicum productas. 

 Palpi compressi, brevissimi, capiti adnati, peniciilo clypei omnino reconditi, rarius apiqe 

 libero porrecti ; articulo basilari elongato, arcuato, nunc subtus squamis linearibus teneris, 

 radiatim patentibus vestito, nunc setis longis diff'usis hirsute ; articulo secundo oblcngo, pilis 



asqualibus 



