390 HENRY SHIMER, M. D. 



may be seen moving about. This apparently very flat gall was placed as 

 mucli below as above the plane of the leaf. Diameter .15 — .25 inch ; 

 vertical thickness .125 inch. 



Dactylosphaera depressum, n. sp. 



Winged imago. — Yellow; head, antennae, legs and a band around the thorax, 

 black J antennte 3-jointed; otherwise as in specimens from gall No. 1. Length 

 of body .04; to tip of wings .06 inch. 



GrALL No. 5. — A subhemispherical gall, projecting beneath into a 

 conoidal point, with a round opening. On June 21st, these contained 

 a great number of pupae, and a few winged imagos. The walls are very 

 thick and the opening below quite close, so that little or no light gains 

 access to the cavity. This gall matures its inhabitants about one week 

 or ten days later than does gall No. 1, which were at this time almost 

 all gone, while these are only just commencing to develope the perfect 

 insect. 

 DactylospLaera conicum, n. sp. 



Winged imago. — Yellowish-white; head yellow, with a blackishline between 

 the eyes; a dusky band around the thorax: antennsB and legs pale; wings 

 whitish-hyaline, lying flat on the back in repose; antennse 3-jointed, the last 

 joint long, subelavate, terminated by two minute points; tarsi with one joint, 

 two claws and two digituli, the latter having fine subglobular ends; abdomen 

 slender, jjointed. Length .05 — .06 inch. 



Gulls on the Blttcr-nut IlicJcory (C. aniara~). 



Gall No. G. — Subglobular galls, varying in size from a quarter of 

 an inch to one inch in diameter, the average being about half an inch, 

 situate on leaf or its stems or mid-ribs; color greenish-white, sometimes 

 with a blush of red on one side. The opening is beneath, in the shape 

 of a small, elongate slit, which at length cracks open, like a chestnut 

 burr, in three or four long slits running up the sides; after this the 

 gall soon turns black and dries away. The cavity within is capacious, 

 the walls being about \ in thickness. 



On June 17th I observed thousands of those galls and took home a 

 large botanical box full for study. They were so numerous as to in- 

 jure the growth of the trees. Those galls that had not yet began to 

 open, and within which no parasites had gained access, were so thickly 

 studded with young lice, that their abdomens pointed directly inward 

 towards the centre, resembling the crystals in a geode, being wedged 

 in as densely as mosaic work, while the whole central cavity was crowded 

 with winged imagos; the former held on with great tenacity, while the 

 latter were easily shaken out. In one gall I counted as many as one 

 thousand inhabitants. At this time (June 17th) many of the galls had 

 cracked open and the winged imagos were escaping in immense num- 



