284 The Ohio Naturalist. [Vol. II, No. 8, 



the north where the rigor of winter and the heat of summer are 

 both ahke 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 were from further north, having already 

 started on their southward journe}-. 



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. vSanders. 



Plienacocciis [Paroudablis) osborni, n. sp. : — Female (adult) is 2 to 2 ■'aiiim. 

 in length, and i to ij4mm. in breadth, is flesh-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 bod}', being 

 especially numerous in the cephalic region. On 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,) i (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 .3mni. 

 x.ismm. 



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, 2.8nmi. From tip of head to tip 

 of folded wings along dorso-median line, i.smni. ; length of wing, i.25mni. ; 

 width of wing, .55mm. ; length of balancers, .imm. Caudal filaments, two 

 about 1.25mm., and two about mini, in length. Front legs ; femur .25nim., 

 tibia .35111111., tarsus, .12mm., claw .03mm. in length. Hind legs; femur 

 .3miii., tibia .4mni., tarsus .13mm., claw .03111111. in length. Antennae are 

 imm. in length, the joints measuring ; ist, 45mmni., 2nd 60, 3rd, 160, 4th, 

 150, 5th, 135, 6th, 120, 7th, 96, Sth, 75, 9th, 63, loth, 90. Formula : 3, 4, 5, 

 6, 7, 10, 8(9, 2,) I. 



