. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BINARY ANTERIOR OCELLI IN ANTS 187 supply among animals other than insects is the unpaired nasal sac of the cyclostome fishes with its paired olfactory nerves. I have been led to consult the literature above cited by finding in some 15 among more than 4,000 gynandromorphs (ergatandromorphs) of a large neotropical ant, Cephalotes atratus quadridens, that the an- terior ocellus is replaced by two smaller contiguous ocelli" (Fig. I).1 Obviously, in these specimens the original paired primordia of the retinae, corneagen cel
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BINARY ANTERIOR OCELLI IN ANTS 187 supply among animals other than insects is the unpaired nasal sac of the cyclostome fishes with its paired olfactory nerves. I have been led to consult the literature above cited by finding in some 15 among more than 4,000 gynandromorphs (ergatandromorphs) of a large neotropical ant, Cephalotes atratus quadridens, that the an- terior ocellus is replaced by two smaller contiguous ocelli" (Fig. I).1 Obviously, in these specimens the original paired primordia of the retinae, corneagen cells and corneae have differentiated in the adult with- out coalescing. Although it seemed probable that similar doubling of the anterior ocellus might occur occasionally among otherwise normal insects, 1 could recall no cases among the many thousands of Formicidae. FIG. 1. Head of gynandromorph (ergatandromorph) of Cephalotes atratus quadridens Degeer, with binary anterior ocellus. One of several specimens. The large eyes, left mandible, thirteen-segmented left antenna, the stippled area and long hairs on the head and clypeus (except along its anterior border) and the papilla-like, stippled projections of the median joints of the right antenna are male characters. and other aculeate Hymenoptera which I have examined during the past forty years. Moreover, my colleagues, Professor C. T. Brues, Dr. J. Bequaert, and Mr. Nathan Banks, who have a very wide ac- quaintance with many orders of insects, were equally certain of never having seen an example of double anterior ocellus and, like myself, could recall no reference to such an occurrence in the entomological 1 This extraordinary number of gynandromorphs occurred in a single huge colony of Cephalotes atratus quadridens Degeer recently collected with great care by Dr. N. A. Weber in the island of Trinidad, B. W. I. A preliminary account of these anomalies was presented at the meeting of the British Association for the Advancement o
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