72 Dr. T, A. Chapman's Notes on 



thoroughly at Barbadillo, at Canales, and at Moncayo, and 

 it, and others more superficially at other points of our 

 journey, but nowhere else did Heterogynis occur than at 

 Canales, and then only on the G. scorpms. This plant was 

 a favourite food of Orgyia mcroliinhata, and a considerable 

 number of Geometers occurred on it ; of these I only bred 

 one or two, which proved to be IT. coronillaria, Euconista 

 miniosaria, and Hyhernia bajaria. 



This Heterogynis is in many respects very close to jff. 

 penella ; as an imago it has a few points of distinction, which 

 are probably quite trivial. On the larva the minute 

 coronetted tubercles are slightly but definitely and con- 

 stantly different from those in IT. penella. There is, how- 

 ever, a remarkable difference in the habits of pupation of 

 the female larva, and consequently in the habits of the 

 imago, that appear to compel one to regard it as specifically 

 distinct. Should any one prefer to regard it as a local 

 race of H. penella, I should consider his personal equation 

 in the matter, as being less typical than my own, but not 

 as being of a very aberrant variety. I propose for the 

 species the name of Canalensis from its habitat. 



The ^ imago has more the general facies of paradoxa 

 than oi penella, it is larger than penella, viz. 22 mm. against 

 penella 20 mm., and is very constant at this expanse. It is 

 nearer paradoxa than penella in the form of the wing, the 

 hind margin being more oblique than in penella, less than 

 in paradoxa, that is, the inner margin is definitely shorter 

 than the costal, to a greater degree than in pienella. 



The fringe is decidedly shorter than in penella., viz. as 10 

 to 11, just the reverse of their wing expanse, at same point, 

 0"60 mm. to 0'66 mm,, and the whole insect has a specially 

 smoothed brushed-down aspect when beside penella. 



It differs from both the other species in coloration. In 

 these species both wings are very similar in coloration, but 

 in canalensis the \ipper and under wings contrast with 

 each other in the way that is so much more usual in 

 Heteroeera. The upper wing has something of the dove 

 colour of paradoxa, var. candelarim, whilst the hind one is 

 decidedly darker. 



In view of the slight differences between the species of 

 Heterogynis as imagines, it has often occurred to me to 

 reflect, that in Lepidoptera generally, specific differences 

 are very frequently confined to small differences of marking 

 or colour, but in Heterogynis both marking and colour are 



