134 Journal New York Entomological Society. [Vol. 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 rileyi, 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 yellow line 

 posteriorly. Legs pale. Wings hyaline, veins blackish brown, basal half of stigma 

 pale. Length, 6.5 mm. 



One 9. Florida, U. S. Nat. Mus. (from Am. Ent. Soc). 

 Larva unknown. 



Isodyctium subgregarium, sp. nov. 



$. Head black, clypeus emarginate with two white dots at tip, labrum pa'e ;. 

 clypeus hollowed below each antennae, the lower rim projecting. Thorax black, 

 tegulse 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, coxse and trochanters 

 spotted with black. Wings hyaline, costa pale at base, second recurrent nervure re- 

 ceived near base of third submarginal cell. Lergth, 6 mm. 



O . 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. prinus) at Pelham Manor, 

 Bronx Park and at several places on Long Island. 



Isodyctium infrequens, sp. nov. 



9 . Robust ; head black, a brown dot between antennce and line at tip of clypeus 

 which is scarcely emargiuate. Thorax dark brown, streaked with black on all the 



