134 Journal New York Entomological Society. [Voi. vi. 
Isodyctium floridense, sp. nov. 
9 . Brown; antennae, except basal joint, black. Head narrowly darker brown in the 
sutures, orbits yellowish. Thoracic lobes lined with yellowish as in rjleyi, bat with¬ 
out black, only darker brown double marks on the side lobes. Abdomen brown, 
basal plates yellowish, lined before and behind narrowly with blackish ; beneath- 
shaded with black, especially towards tip. Mesopleura brown, with a jellow line 
posteriorly. Legs pale. Wings hyaline, veins blackish brown, basal half of stigma 
pale. Length, 6.5 mm. 
One ?. Florida, U. S. Nat. Mas. (from Am. Ent. Soc.). 
Larva unknown. 
Isodyctium subgregarium, sp. nov. 
g . Head black, clypeus emarginate with two white dots at tip, labrum pa’e 
clypeus hollowed below each antennae, the lower rim projecting. Thorax black, 
tegulae and collar (except a black dot) white ; a line on mesopleura and sutures below 
white. Abdomen whitish, basal plates and four terminal segments above black, be¬ 
low shaded with black. Legs pale, tarsi shaded with blackish, coxae and trochanters 
spotted with black. Wings hyaline, costa pale at base, second recurrent nervure re¬ 
ceived near base of third submarginal cell. Lecgth, 6 mm. 
9 . Pale yellowish, head, thorax and pleura red Antennae black except basal joint; 
narrow black linings in head grooves and in sutures behind mesothorax. Legs yel¬ 
lowish, tarsi slightly tipped with blackish. Wings hyaline, nervures pale, those to¬ 
ward center of wing lined with black. No middle cells in hind wings. Length, 6 .5 mm. 
Stage IV. —Head green with a large triangular black patch on each 
lobe and one in clypeus; width .8 mm. Spines furcate, short, three on 
second and fourth annulets, one behind spiracle, two on each subven- 
tral fold, the smaller ones simple. Spines black except the subventral 
ones; feet pale, abdominal ones on joints 6-12, 13. 
Stage V. —The same ; patch in clypeus double; width of head 1.2 
mm. Spines distinct, the limbs curving, divergent and tapering. 
Stage VI. —Head 1.8 mm. Body uniformly green from food, 
spines black except on lower subventral fold. No change in coloration. 
Stage VII. —(Ultimate.) Smooth, entirely green, eye black; 
shining areas in the places of the spines. Enter the earth and form 
cells ; single brooded. 
The larvae are gregarious in the early stages, but separate before 
maturity. 
Found in May on white oaks (Q. alba, Q. primes') at Pelham Manor, 
Bronx Park and at several places on Long Island. 
Isodyctium infrequens, sp. nov. 
9 . Robust; head black, a brown dot between antennae and line at tip of clypeus 
which is scarcely emarginate. Thorax dark brown, streaked with black on all the 
