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Psyche 4:52, 1883.

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PSYCHE. [May-June iSS3.
THE TARSAL AND ANTENNAE CHARACTERS OF PSOCIDAE. BY HERMANN AUGUST HAGEN, CAMBRIDGE, MASS. [Reprint from Entom. mo. mag., June 1882, v. 19, p. 12-13.] By a mere chance I see that a state-
ment recently published by me concern-
ing the tarsal structure of fsocidae
confirms, in a most satisfactory manner, that made by Prof. Westwood in 1857
(Proc. Ent. soc. Lond., series 2, vol.
iv, pp. 63, 64) regarding certain coleo- ptera.
Being occupied with the atrojina, I
was astonished to find that the young
forms have only two-jointed tarsi (in-
stead of three-jointrd, as is found in
the imago), but the last joint, internally, in the middle, shows a more or less
visible division, where the 3rd joint
(the median) will be formed, and just
below it are one or two small bristles. I have observed this in A[frojos] divin-
do& (reared by myself), succinica,
and oleafrim and also in Hyferetes
tessellatus. So long as the young have
only two-jointed tarsi, the antennae have also less joints. Thus, in A. divinato-
ria the latter have only 12 instead of
the 15 of the imago ; in Hyperetes the
proportions are 13 to 23. But, although
the third (middle) joint of the tarsi is produced by a division of the apical,
it is just the contrary with the antennae- In these the two thick basal joints, and the apical joint are not divided ; but in some species all the intermediate joints are so. Hvfiereter~ is in the latter case, all the 10 intermediate joints being divi- ded in the imago, as I can show from
preparations. It is a remarkable fact
that the mysterious Hyferetes shows, in
its earlier stages, precisely the normal number (13) of joints for the fiocidae.
I am not prepared to give an opinion
as to this genus. Other genera, such .
as Caecilifis, commonly considered to
have only two-jointed tarsi, possess a
small aborted third joint, just as occurs in many coleoptera.
Cambridge, Mass., 1st April, 1882.
THE CHIGOE IN AFRICA.--It is sta-
on the west coast; but now it ranks
ted in Bin-ton and Cameron's '$ To the with the indigenous red, white and Gold Coast for Gold" that the chigoe black antb, centipedes, scorpions, veno- (Pulex $emtrans) has been recently mous spiders and flies of the tzetze introduced and has spread all over the group, as among the chief plagues of West African seaboard
and far into the that region.-Amer. nat~walist, June interior. At the time of Captain Bur- 1883, v. 17, p. 664. ton's first visit (1862) it was unknown




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