1941] 
Amber Aradidae 
97 
distinct antennae. The antennae of a female specimen of 
ghilianii, determined by Montandon and kindly loaned for 
comparison by Mr. W. E. China of the British Museum 
(Natural History) , are much shorter than the head, 19 : :26, 
with the proportional length of segments one to four as 
4:4:4:7. 
The species of Calisius, due to their obscure habits and 
small size, have escaped the notice of most general collectors 
and hence are very imperfectly known. Most of the twenty- 
one species were described by Bergroth 2 > 3 or by Horvath 4 
in his excellent monograph of the old world species. Costa, 
Stal, Champion, Kirkaldy, and Schouteden have likewise 
added species and three as yet undescribed species are be- 
fore me from islands of the south Pacific. 
Occasional records from widespread localities throughout 
the world suggest that the tribe Calisiini is very widespread 
and may even prove to be tropicopolitan, though no species 
have yet been recorded from the great Oriental Realm. With 
New Guinea (4 species) as a possible center, somewhat less 
than half of the species known to me radiate southward to 
Australia and Tasmania, eastward to Fiji and the islands 
of central and southeastern Polynesia, and northward to 
Micronesia. All of these species, as well as the two Euro- 
pean species, ghilianii and solids, are similar in body form 
and lack the prominent black granules at the apex of the 
scutellum and on the sides of the scutellum near the middle 
which are characteristic of the American species. 
The discovery of an Oligocene species which is clearly 
congeneric though falling in a separate group, as used above, 
with greatly reduced connexival and other granules, a very 
broad head, and uniformly dull and immaculate coloration 
indicates great age and relative stability for the group. A 
warmer climate and probably different limits of tolerance 
doubtless permitted Calisius balticus to survive so far north 
2 Bergroth, E. Notes on American Hemiptera. II. Canadian Ent., 
45:1-8,1913. 
3 Bergroth, E. A New Species of Calisius. Canadian Ent., 45:9, 
1913. 
4 Horvath, G. Species mundi antiqui generis Calisius. Ann. Mus. 
Nat. Hungarici, 11:623-634, 10 figs., 1913. 
