EGG AND FIRST-STAGE LARVA OF PAPILIO HOMBRUS. 101 



hairs ; a little group of three below this, and one ventral hair 

 (viii. ?) ; the hairs below are all much smaller and finer than 

 those on the bosses. On the second abdominal i. is a small 

 sessile hair, ii. a low wart with five or six hairs (of which two or 

 three are large but less than those on the great warts), iii. single, 

 IV. and V. as on first abdominal ; but in place of the little group 

 of three hairs vii. and the ventral hair is an oval area, with about 

 a dozen fine hairs, and looking as regards size and position much 

 like a proleg. Third, fourth, fifth, and sixth abdominal are 

 much the same; the hairs of wart ii., however, rather smaller 

 and finer, and prolegs in place of the ventral patch. On seventh 

 wart II. is a little larger ; on eighth it is larger (though less than 

 the large ones in four), and carries six rather long curved hairs, 

 III. IV. and V. single hairs ; i. is present on ninth abdominal, but 

 II. is again a very high large wart, with some fourteen hairs ; on 

 tenth are again two warts, lower and with shorter hairs to the 

 number of about a dozen on each ; they are two warts, not 

 merely a terminal fringe. There is a group of five hairs further 

 out on tenth (or on ninth ?) ; there are also five or six hairs near 

 eighth spiracle, but their homology not easy to determine. The 

 prolegs are very large, nearly 0'2 mm. across, on short thick 

 pedicels, the outer front of which is armed with about twenty-five 

 short thick hairs, with one on inner posterior margin. The 

 crochets are arranged in an oval, the long axis of which is 

 directed outwards and backwards. The oval is, however, broken 

 at each end, so that there is an inner posterior set of hooks of 

 about twenty-four in number, and an outer anterior numbering 

 about nineteen or twenty ; the inner are the larger as well as the 

 more numerous. Each set dwindles in size of hooks at each 

 end ; when collapsed the two sides meet along the axis of the 

 oval. The claspers are in one row of fifty to sixty hooks, forming 

 about three-fourths of a complete circle or ellipse. The spiracles 

 are small brown circles, with lines radiating to the centre ; the 

 prothoracic one is slightly oval ; longest axis about 0*04 mm. 

 The general surface has an extremely fine dotted texture. 



Descriptions of Plates IIT.-V. 



Plate III. — A stereoscopic picture of the newly-hatched larva, x 12J. 

 Photo by A. E. Tonge, F.E.S. 



Plate IV. — Egg-shells of P. homerus, x 10. Photo by A. E. Tonge. 



Plate V. — Micropyle of the egg of P. Iwmerus, x 250. Photo by 

 F.N.Clark. 



The eggs are only empty shells, and with holes in them made by the 

 larvse; one or two are, however, but little deformed. The upper one is 

 placed on its side to show the flattening of the lower surface. The stereo- 

 scopic pictures may be readily examined by means of any of the stereoscopes 

 that are open below, of which there are several forms to be had very cheaply. 



