( ey D 
dimorphism the dry-season form was often conspicuously smaller 
than its wet-season representative ; and (2) the fact that the 
males of species which were easily discriminated in their wet- 
season phases might be almost indistinguishable from each 
other in the dry-season garb, the same applying, though less 
markedly, to the females. In the case of the four species of 
Teracolus shown, though there was a family likeness between 
all the wet-season forms, they could nevertheless be distin- 
guished ata glance. On the other hand, the dry-season forms 
of the same four species resembled each other so closely in 
aspect, and even in size, that they could not be separated 
without minute examination. He knew from personal ex- 
perience that these dry-season forms were most difficult to 
identify in the field. The two species of Huphina, again, bore 
in their dry-season phase a very close resemblance to each 
other, but in the wet-season they were quite dissimilar. 
He did not advance either of these points as being of uni- 
versal application ; though the former of them, at least, was 
of very common occurrence. 
Forms oF OspHyA AND ConcurRRENT Sprcres.—Mr. G. C. 
Cuampion showed on behalf of Mr. J. Epwarps specimens of 
the genus Osphya and read the following note communicated 
by him :— 
‘“This exhibit consists of five forms of Osphya together 
with certain other species occurring at the same time and 
place, and which, having regard to gait and appearance, re- 
semble them more or less closely. It is not suggested that 
these resemblances are protective. On the whole, the numbers 
of Telephorus pellucidus much exceed those of the normal male 
of Osphya (a), but on some occasions the two species occur in 
approximately equal numbers ; and the same may be said of the 
normal female (6) and Zelephorus lividus. The ‘nigripenne 
form of female (c) occurs in a proportion of approximately 
two per cent. to the normal form, and its proportion of occur- 
rences to those of Zelephorus rusticus is, of course, much 
smaller ; still, the resemblance of the two insects in life is 
very striking. About five per cent. of all the females are of 
the small form (¢), and the resemblance between these and 
Lelephorus hemorrhoidalis, though noticeable, is not very 
