OF WASHINGTON. 195 
FEBRUARY 7, 1889. 
Thirteen persons present. President Schwarz in the chair. 
Mr. Howard read the following paper : 
NOTE ON THE HAIRY EYES OF SOME HYMENOPTERA. 
BY L. O HOWAHD. 
Presence of hairs on the eyes of Hymenopterous insects, and indeed of 
insects of other Orders, has been seldom noticed in general works. Recent 
papers on the compound eye by Lowne, Graber, Greinacher, Mark, and 
others make no mention of these hairs. Siebold (Anatomy of the Inver- 
tebrata) says: "With some Hymenoptera and Diptera they are pilose, 
the hairs being inserted at the angles of the facets." The instances given 
in the foot-note are Apis, Tabatius, Anthomyia, Eristalis, Volncella, and 
other Diptera. 
Burmeister says, after Joh. Mailer: "Upon the superior surface we 
occasionally observe, particularly with bees and flies, fine hairs projecting, 
which may be considered as analogous to the eyelashes, as they doubtless 
prevent the approach of external bodies, but at the same time limit the 
visual circle of each facet to the space itself occupies." 
Lashes, or so-called " hairy " eyes, occur with Lepidoptera and with 
certain Coleoptera. In case of the Coleopterous genus Xenos the facets 
are subpentangular, and are separated by narrow spaces filled with dense 
minute ciliae. 
With the Hymenoptera these hairy eyes do not seem to occur with the 
horn-tails, saw-flies, or any of the wasps, nor with the true ants, Mutil- 
lidse or Chrysididae. With true bees, however, they occur in Apis and 
Ccelioxys. Among the Crabronidae they are found in the genus Ento- 
ing here Mr. Fauvel's arrangement of this material, and it will be seen that 
he approaches the subject from a standpoint somewhat differing from that 
taken by the writer of this address : 
I. ENDEMIC SPECIES COMMON TO EUROPE AND NORTH AMERICA. 
1. Species of the boreal, alpine, or subalpine regions. 
2. Species of the lower, temperate region. 
II. IMPORTED SPECIES. 
1. Species imported from temperate Europe. 
2. Cosmopolitan or sub-cosmopolitan species. 
. Species originating in the temperate Europeo-Siberian fauna. 
b. Species originating in the Oriental fauna. 
c. Species originating in the Ethiopian fauna. 
d. Species originating in the Neotropical fauna. 
e. Species of uncertain origin. 
f. Species of unknown origin. 
