NORTH AMERICAN HOMOPTERA. 301 



color dull yellowish brown, with a longitudinal row of large, quadrangular, 

 black spots ou each side of dorso-iueson, and a row of less distinct black spots 

 aloug each margin; on head and prothorax these spots so run together that 

 they are usually not distinguishable from each other; eyes black; cornicles 

 orange, or orange-yellow, usually paler at the base, slightly expanding from base 

 to near tip, and then contracting to an obtuse point; not flanged at tip. An- 

 tenna} long, slender, black ; joint three longest, but shorter than four plus five, 

 the latter being subequal ; the proximal and distal parts of six subequal, the 

 whole joint being as long as five. Cauda short, obtusely rounded at tip. Legs 

 long, black, with base of femora yellowish brown. A very small pointed tuber- 

 cle ou each side margin of prothorax ; sometimes obsolete. Antennfe and legs 

 sparsely furnished with short hairs. 



Described from several living and dead specimens taken on Salix 

 Oct. 28, 1892. Some of the specimens were in copula with oviparous 

 females. 



Liacliniis strobi Fitch. 



A number of young white pines infested by this species were 

 found at Hanover during the Autumn of 1892. The forms present 

 were the winged males, the wingless oviparous females and the eggs. 

 The habits and conditions were precisely the same as observed in 

 Ohio, and reported in the fifth of this series of contributions. 



Pemphigus inibricator (Fitch). 



This species, originally described by Dr. Fitch as Schizoneura hn- 

 bricator, was rather common on beech trees in the vicinity of Co- 

 lumbus during the Autumn of 1890. Infested twigs look, at little 

 distance, as if covered on the underside with wool or cotton, on ac- 

 count of the long cottony secretion with which the insects are fur- 

 nished. The wingless forms and nymphs are especially provided 

 with this substance. When a colony is disturbed each aphid emits 

 a small drop of "honey-dew" and the nymphs begin waving their 

 abdomens back and forth. Late in October and early in November 

 the only forms present, so far as my observations went, were winged 

 viviparous females, and nymphs of the same. I was unable to de- 

 termine the method of hibernation. 



Winged Viviparous Female.— Body 4 mm. long by 1.5 mm. wide across abdomen. 

 Head to tip of folded wings 7 mm. Wing expanse 13 mm. antennaj 1.1 mm. 

 Head and thorax black, with more or less brown between articulations, especially 

 on ventral surface. Abdomen yellowish, or greenish brown, with an olive-green 

 vase-shaped marking on middle of dorsum, and a longitudinal marking of same 

 color near each margin, the latter often uniting posteriorly by a faint curved 

 transverse line as shown in the figure. Legs piceous, except bases of femora, 

 which are sometimes brown. Autenuse piceous; joint iii equal to iv plus v, 



TRANS. AM. ENT. SOC. XX. NOVEMBEE, 1893. 



