mee, LSP LAN-PS¥YLLIDAR. 
By D. I. Crawrorp, Stanford Umiversity, California. 
(Plates xxxili—xxxv). 
The following paper presents the descriptions of several new 
genera and species of Psyllidae, a family of Homoptera near to 
the Atijdidac, which were sent to me for determination by the 
Indian Museum in Calcutta and the Museum of the Agricultural 
Research Institute in Pusa, Bengal. For the sake of convenience 
the two collections are treated separately, since only a few of the 
species are found in both. Several species of Indian Psyllidae 
have been described by Dr. Kieffer and Mr. Buckton, and at a 
later date the writer hopes to publish a key to all the Indian 
genera and species so far described. The types of new species 
from the Indian Museum are deposited in that place; the other 
types, however, are retained in the author’s collection. 
The illustrations, designed to show the most important 
characters, are drawn more or less to scale. Especially is this true 
of the figures of the forewings, in order to show the relative sizes 
of the insects; Trioza gigantea, Kuwayama hirsuta and Phacopteron 
lentiginosum are enlarged to only one-half the relative size of the 
others. 
I.—COLLECTION OF THE INDIAN MUSEUM. 
Genus Phacopteron, Buckton. 
Insect large, robust; thorax strongly arched; head small, 
more or less retracted, narrower than thorax, with facial cones 
rather short, divergent, separate at base, subacute; eyes large, 
hemispherical; antennae slender. Prothorax long, almost vertical ; 
propleurites at least moderately large, suture between them and 
pronotum not distinct; mesopleurum large; legs long; femora 
large; hind coxae very large, elongate, contiguous along inner 
margin, with spur short. Forewings large, more or less hyaline, 
somewhat rhomboidal in outline; radius and fourth furcal connec- 
ted by a short cross-vein, making a third marginal cell. Usually 
gall-making. 
Type of genus: Phacopteron lentiginosum (Buckt.). 
This genus is unmistakably related closely to Pachypsylla in 
neatly all its characters except the venation, in which it is similar 
to Ceriacremum. Because of this similarity it has hitherto been 
grouped with the latter genus, but this relation is only in the wing 
venation, whereas all the rest of the anatomical characters, even 
the shape of the wing, point to its affinity with Pachypsylla. By 
some unaccountable error Enderlein, in his paper on the Psyllidae 
