624 NEW YORK STATE MUSEUM 



loiicrituclinal (Trooves, converointr towards the scutellum and a short crroove 

 on each side of the middle one, reaching halfway from the collar to the 

 scutellum, also a short, shallow groove or depression over the base of the 

 wings. Scutellum with coarse, irregular pits or punctures. Legs reddish 

 brown, coxae and tips of tarsi dark brown or black. Dorsal portion of the 

 abdomen black, ventral, reddish brown, second segment has a few scattered 

 hairs beneath the wings, others (e.xcejjt the first) minutely punctate. Wings 

 hyaline; veins brown, rather slender; areolet small, distinct; radial area 

 not closed. Length . 1 5. 



Horned oak gall. ^Indricus cornigcrns Osten Sacken. This irregu- 

 larly rountled gall is woody with numerous hornlike protuberances through 

 which the gall tlies escape. It is very hard, of the same color as the branch, 

 is from ^i. to \% inches in diameter and contains within many larval cells. 

 It occurs on the branches of pin oak, scrub oak and black-jack oak aiid is 

 recorded by Beutenmuller as being exceedingly common in the vicinity of 

 New York city. 



Oak tip gall. Amir tats claviila Bass. A green or l:)rown, club-shaped, 

 hard, woody gall with a few leaves growing from its summit, occurs at the 

 tips of white oak twigs. It is recorded by Beutenmuller as very common 

 about New York. 



Rough bullet gall. Holcaspis ditricofia Bass. A globular, rough gall 

 with conelike apex, occurs somewhat commonly on scrub and swamp oak. 



This gall resembles the bullet gall but may be distinguished by its 

 much rougher exterior, less globular form, flattened base, and tlie apex 

 extended into a conelike process. It occurs rather commonly on scrub oak 

 at Karner and it is stated by Beutenmuller to be rare on swamp oak in the 

 vicinity of New York city. 



Oak bullet gall. Holcaspis globulus Fitch. Bulletlike galls in clusters 

 of two, three or more are common on the terminal twigs of white oak and 

 occur also on the post and chestnut oaks. This gall is yellow or reddish in 

 summer, turning brown with the approach of cold weather, is corky in 

 texture and contains a larva in the small central cell. 



Oak potato gall. Ncurotcrus batattis Fitch. Large, hard, uneven galls 

 Y^ inch thick and two or three times as long, somewhat resembling a potato 

 in shape, occur on white oak twigs. 



This peculiar deformity to oak twigs is abundant on the branches of 

 young trees in the vicinity of New York city. It is a hard, woody 

 growth with the surface coated with pale bluish bloom and internally it has 

 a dense corky texture with numerous larval cells. It is sometimes cjuite 

 injurious on account of its deforming young trees. 



Noxious oak gall. N'airofcrus noxtosiis Bass. An irregularly rounded, 

 hard, woody gall resembling that of N. batatus Fitch, occurs on the 

 terminal twigs of swam]i white oak. 



