STATE HORTICULTURAL SOCIETY. 199 



The legs and antennns are very short, often scarcely visible ; the latter are 

 five-jointed and slender. There are three discoidal veins, all simple and 

 straight. There are no honey-tubes on the abdomen. They usually pro- 

 duce gall-like swellings on the twigs, some of which take the form of pine 

 or spruce cones. 



The species here given is mentioned by Packard, in his Guide, with- 

 out name. I have added the specific name here given, provisionally and 

 simply for present use. Packard states that he has found it in abundance 

 on the spruce in Maine, where it produces swellings at the ends of the 

 twigs, resembling in size and form the cones of the same tree. 



84. Honnaphis hamatnelidis, Ost. Sac. The Witch Hazel Plant-louse. 



In this genus the wings are laid flat on the back, in repose, extend- 

 ing much beyond the body ; the second discoidal vein appears to arise 

 from the first, as though a branch of that vein ; the third is obsolete at the 

 base : the arc vein, at the tip, is here in the form of a fourth branch vein. 

 The hind wing has a projection on the anterior margin ; but one branch 

 or discoidal vein. The honey-tubes are either small or obsolete ; anten- 

 nae, short, from three to five-jointed. This species inhabits obliquely con- 

 ical or horn-like galls on the upper side of the leaves of the witch hazel; 

 opening, as usual, on the under side. 



85. Rhizobiiis lactuccel,Y\xc\\. Lettuce Earth-louse. 



The species of this genus are characterized by the habit of residing 

 under ground; being without honey-tubes; never, or at most very rarely, 

 acquiring wings; and being always (?) viviparous and never produced 

 from eggs ; antennae but five or six-jointed, the last joint being longer 

 than those preceding it, and blunt at the end. 



This species infests the roots of lettuce in great numbers, appearing 

 early in the season, and, unless destroyed in some way, increasing in 

 numbers with the age of the plant. The mature individuals are scarcely 

 over one-twelfth of an inch long, oval in shape, whitish or pale yellow, 

 having the body and antennae dusted over with a white powder ; the legs, 

 dusky. It does not appear that the plant is seriously injured by these 

 insects. 



Genus Phylloxera. 



This genus, which has recently been brought into such prominence 

 on account of the injury to grape vines by one of its species, is character- 

 ized as follows: Antennae, three-jointed, the third or terminal joint much 

 the longest ; by carrying its wings overlapping and flat upon the back in 

 repose ; by being always oviparous, the agamic females never producing 

 living larvae. The veining of the fore wings appears to vary more than 

 in the preceding genera, but the typical form is somewhat as in Hortna- 

 phis ; the second discoidal vein arising from and as a branch of the first : 

 the third, simple, and more or less complete or wanting; arc vein, at the 

 apex, and the rib vein, sometimes more or less obliterated. Hind wings 



