194 Illinois State Laboratory of Natural History. 



tened button-like apex having radial slits, apparently^ 

 closed by a delicate membrane; a longitudinal row of 

 minute brown thickened rings (one ring to every ten to 

 twenty annuli) extending from near base to apex. From 

 each of these rings protrudes a delicate membranous pa- 

 pilla, and a short membranous tube unites it within to the 

 trachea, which extends the entire length of the respiratory 

 tube [Fig. 20]. The other tube is usually only about 2 

 mm. long, slender and twisted, but of similar structure^ 

 tracheated, and with numerous lateral papillsB. The right 

 tube was developed in 23 pupae, and the left in 3; in 

 one, both were developed, but still unequally, the right 

 21 mm., the left 13 mm. long, their combined length 

 thus about equal to that of the singly developed tube. 

 Thorax and base of abdomen above transversely wrin- 

 kled; tips of middle and hind legs closely applied and 

 ending equally at apex of second abdominal, anterior 

 legs overlaying the middle pair and shorter. 



Abdomen similar in vestiture to that of larva; dirty 

 whitish, with brownish fuscous closely-set transverse 

 plates above and below, confluent towards its base, each 

 bearing a row of cylindrical tubercles with a stellate cir- 

 cle of acute diverging teeth at apex, and a central seta 

 [Fig. 21]; lateral areas with longitudinal rows of fus- 

 cous dots, bearing similar setiferous tubercles; position 

 of larval false feet feebly indicated; sutures marked by 

 a broader whitish line; segments increasing in length to 

 the fifth abdominal, which is nearly' twice as long as 

 thick; sixth and seventh indistinctly separated, together 

 shorter than fifth; seventh with the dorsal and ventral 

 transverse bars broken up, and a semicircular fuscous 

 apical area above and below; eighth and ninth very 

 short but distinct, yellowish fuscous, pallid near the 

 sutures, eighth with a few setiferous tubercles and a 

 spinous hook beneath, ninth with a fleshy projection 

 above, and a pair of small spinous teeth beneath, ending 

 in the female with a pair of conical contiguous projec- 



