44 INTRODUCTION. 



extremity, which in the typical group consists of a cylindrical club attenuated at 

 both ends. The subdivisions of the stirps exhibit, however, several variations of 

 form according to their situation in the series. In Colias these organs are filifonn at 

 the base and gradually and uniformly thicker towards the extremity, indicating in 

 this particular, an approach to the Vermiform stirps. In Pieris the club is more 

 suddenly swelled towards the extremity, which is compressed. In the true Papi- 

 liones the Javanese collection exhibits the following varieties: 1st. — antennge with 

 neai-ly uniform articulations, marked with distinct, prominent, annuli or rings ; plate 



iv, fig. 11, c; 2d antennae with an oval compressed club, in which the annuli are 



closely arranged or crowded ; plate iv, fig. 12, c ; 3d. — antennae with uniform length- 

 ened articulations and more obscure annular swellings ; plate iv, fig. 13, c. The 

 variations of form in the metamorphosis, corresponding to these characters, will be 

 pointed out in the descriptive part. 



The feet in this stirps, are generally long and robust ; all three pair are perfect 

 and fitted for walking ; in the insects which constitute the typical species, the ante- 

 rior tibiae have near the middle a spine or short acute process, which is either naked 

 or partially concealed by hair. The first tarsus is on all the feet of great length, 

 and the claws are long, slender, naked, and in the typical group, exserted ; in the 

 subdivisions which approach the confines of the neighbouring stirpes, the claws pre- 

 sent various peculiarities. 



In Colias the anterior feet are comparatively slender, but they are complete in all 

 parts. The posterior tibiae have a single pair of spines only at their union with the 

 tarsi ; which character is common to all the stirpes of the first tribe, excepting the 

 Anopluriform. The abdomen is generally cylindrical, of considerable length and 

 attenuated at the extremity, but it is subject to several modifications of form; in one 

 of the subdivisions it is provided with a hook at the extremity. In the female the 

 abdomen is generally ovate and contracted near its union with the thorax. The pro- 

 boscis in the typical species is very long and robust. The ei/es are comparatively 

 large and prominent. 



I proceed to the Chilopodifokm orScoLOPENDRiFORM stirps, restricting my remarks 

 at present to the notices required for the illustration of a general synoptic table of 

 the true Papilionidce, which is given in the sequel. In describing the Chilognathi- 

 form stirps I have already pointed out the characters in the genera Heliconia and 

 Euploea, which, in their larva state, retain a striking affinity to this stirps. I there- 

 fore consider these genera as forming a natural transition from the Chilognathiform 

 to the Chilopodiform larvae. The genus Acrcea was originally arranged in our cabinet 

 after Euplcea and Idea, from considerations of the perfect insect ; this arrangement 

 is now confirmed by the character of the larva, and in proof of it, I refer the reader 



to 



