Explanation of Plates, 79 



Figs. 2, 3, 4. Tubercles of last stage larva, x 250. Compared witli 

 other species they look thick and strong, and are short, 

 about half their length. The short spines are very 

 distinct, but short and obtuse. 

 5, 6, 7. Heterogynis canalensis. 



Tubercles in last in star, x 250. They are wide, open and 

 shallow, consequently many, in a prepared specimen, 

 present tliemselves as fig. 6, opened out flat. The 

 smaller spines are often absent, and when present are 

 always few, short and rounded. 

 8-13. Heterogynis penella. 



Tubercles in last instar. x 250. The basal or tubular 

 portion is longer and narrow, may be nearly cylind- 

 rical, never so widely salver-shaped as in canalensis ; 

 in preparations, an open flattened one, as fig. 9, is 

 rare and always distorted. The short spines are 

 numerous, sharp, long and needle-like. 



Plate XIII. 



View of Canales de la Sierra (Province of Logroiio) from the 

 W.N.W., below a spur of the ridge to the North of the Valley. 

 The distant point is to the North of the Cebollera. 



Plate XIV. 



Rough sketch map of the Sierra district between. Burgos and 

 Saragossa to give some idea of the position of Canales de la Sierra. 



