124 NEW YORK STATE MUSEUM 
Oligotrophus acerifolius n. sp. 
Male. Length 1.5; mm. Antennae probably nearly as long as 
the body, sparsely clothed with long hairs, dark brown, 15 segments. 
Mesonotum dark brown; scutellum and postscutellum reddish 
brown, the basal abdominal segments dark brown, the others 
reddish, spotted with carmine. Genitalia dark brown; legs a 
variable brown, lighter ventrally; tarsi slightly darker. 
Taken on maple or other trees and shrubs at Albany, N.Y. May 
£7. LOO: 
Type Cecid. 33, N.Y. State Museum. 
Oligotrophus pini n. sp. 
Male.’ Length 2.5 mm. Antennae longer than the body 
sparsely clothed with long whitish hairs, dark brown, 14 segments. 
Head and mesonotum dark brown, the latter reddish posteriorly. 
Scutellum and postscutellum reddish. Abdomen yellowish red; 
coxae pale yellowish, femora light brown distally, lighter ventrally; 
tibiae and tarsi light brown, the former somewhat darker distally, 
the terminal tarsal segments somewhat darker. 
Taken on pine at Albany, N.Y. May 26, 1906. 
Type Cecid.87, N.Y. State Museum: 
Oligotrophus cornifolius n. sp. 
Female. Length 1.25 mm. Antennae extending to the 2d 
abdominal segment, reddish brown, sparsely haired, 13 segments. 
Mesonotum dark brown, submedian lines and the median area 
posteriorly yellowish. Scutellum yellowish red with numerous 
yellowish apical setae; postscutellum yellowish. Abdomen yellow- 
ish with the basal segments tinged with red, the 1st slightly 
darker. Femora and tibiae yellowish tinged with red; tarsi some- 
what darker, tinged with red, color somewhat variable. 
Taken on Cornus florida at Albany, N.Y. May 18, 1906. 
Type Cecid. 49c, N.Y. State Museum. 
Oligotrophus caryae n. sp. 
Female. Length .75 mm. Antennae extending to the middle 
of the abdomen, sparsely haired, light brown, 14 segments. Face 
yellowish; mesonotum black; scutellum and postscutellum reddish 
brown. Abdomen reddish brown with the segments margined 
