286 
Psyche 
[December 
record as it comes to the attention of the observer, by publishing 
a good description, accompanied by a figure if possible, and by 
stating where the specimen has been deposited. It may well be 
considered a duty to do this much, since it must be largely from 
such reports of sporadic cases that data and materials may be 
assembled for consideration by those who may wish to make in- 
tensive studies of teratology to supplement experimental data to 
which it may be pertinent. Moreover, every case of insect ab- 
normality should be reported however commonly the particular 
type of malformation may have been reported before; for the 
multiplication of examples of any one type of variation may well 
be as important as reporting unique examples of entirely new 
types. 
Among the various examples of insect malformation en- 
countered by the writer, one of the most interesting is a specimen 
of the common short-horned grasshopper, Melanoplus differen- 
tialis. This specimen, which seems to be normal in every other 
respect, has four ocelli instead of the three which are normal for 
this species. In this specimen the lateral ocelli are normal in 
position, in form, and in size. The median ocellus, however, is 
represented by two perfectly formed ocelli which are disposed 
symmetrically, one on each side of, and laterad from the point 
where the normal median ocellus should be, and separated from 
each other by a distance somewhat greater than the diameter of 
a normal median ocellus. 
Each of these para-median ocelli presents the characteristic 
oval form of a normal ocellus, each has a characteristically dis- 
tinct, convex cornea, and each is situated in a separate charac- 
teristically oval depression in the front; but these aberrant ocelli 
are somewhat smaller than normal, so that the two ocelli together 
would present an aggregate area but little if at all greater than 
the area of a normal median ocellus. 
The individual presenting this abnormality was found 2 in a 
lot of several hundred specimens which had been preserved for 
2 The attention of the writer was first directed to the anomalous condition 
of the ocelli in this specimen by a student in the introductory course in general 
entomology, Miss Margaret Windsor, who protested that the specimen given 
her for study did not agree with the specifications in the laboratory outline. 
