284 
The Ohio Naturalist. 
[Vol. II, No. 8, 
the north w here the rigor of winter and the heat of summer are 
both alike tempered by the surrounding lake. 
The islands visited were : Middle and North Bass, Sugar the 
Hen and three chickens, North Harbor, East Sister— nine in all. 
Fifty-eight species were recorded for the whole archipelago, 42 of 
which were found on Middle Bass. Of these 58 species there 
were possibly six which w'ere from further north, having already 
started on their southward journey. 
During the spring migrations this chain of islands should be a 
Mecca for the bird student. There can be but little doubt that it 
is the highway for many rare species. 
Oberlin, Ohio. 
A NEW PHENACOCCUS ON PLATANUS OCCIDEN= 
TALIS. 
J. G. Sanders. 
Phenacoccus (Paroudablis) osborni , //. sp. :■ — Female (adult) is 2 to 2^mm. 
in length, and 1 to i^mm. in breadth, is flesli-colored and covered with a 
slight, white powdery secretion. There are seventeen very short, inconspic- 
uous, lateral filaments on each side. Although the filaments are short, spin- 
nerets and numerous hairs are scattered over the surface of the body, being 
especially numerous in the cephalic region. O11 the anterior ventral margins 
of the second and third segment, are two large spiracles. The anal lobes, 
bear each, two long hairs and three short ones, besides the spines. The large, 
retracted anal ring bears the customary six long hairs, and is conspicuously 
dotted. The eyes are prominent, though not large. The antennae are eight 
jointed, the eighth joint, in many specimens, having a tendency to divide. 
The formula is as follows : 8, 3, 2 (4, 5,) 1 (6, 7). The legs are well devel- 
oped and darker in color than the body ; the tibia being nearly three times 
the length of the tarsi, and bearing a pair of strong spines on the distal end. 
Numerous hairs are borne by the tarsi but no noticeable digitules. A pair of 
knobbed digitules is borne by the long single-toothed claws. 
The eggs are long-elliptical, golden-brown, rather firm, measuring .3111111. 
x.i5mm. 
Male (adult) is an active, well-constructed insect ; the thorax constituting 
one-half the length of the individual. Measurements : From tip of head to 
tip of abdomen, .85mm. ; wing expanse, 2.8mm. From tip of head to tip 
of folded wings along dorso-median line, 1.5mm. ; length of wing, 1.25mm. ; 
width of wing, .55mm. ; length of balancers, .mini. Caudal filaments, two 
about 1.25mm., and two about imm. in length. Front legs; femur .25mm., 
tibia .35mm., tarsus, .12mm., claw .03mm. in length. Hind legs; femur 
.3mm., tibia .4mm., tarsus .13mm., claw .03mm. in length. Antennae are 
imm. in length, the joints measuring; 1st, 45mmm., 2nd 60, 3rd, 160, 4th, 
150, 5th, 135, 6th, 120, 7th, 96, 8th, 75, 9th, 63, iotli, 90. Formula : 3, 4, 5, 
6, 7, 10, 8 (9, 2, ) 1. . 
