26 
Many together on leaf. 
Paired at base of blade of leaf; extending from middle to edge. 
9. rcsinicola n. sp. 
Distributed irregularly along blade on either side of midrib, rarely on edge 
of leaf 19. hyalina Nort. 
INDEX TO SPECIES OF PONTANIA. 
acuminata n. sp. 9 11 
agilis Cr. $ 9 5 
atra n. sp. 9 18 
atriventris n. sp. 9 21 
bruneri n. sp. 9 15 
californiea n. sp. $ 9 22 
cressoni n. sp. 9 1 
desmodioides Walsh ^9 25 
excavata n. sp. $ 9 8 
gracilis n. sp. 9 23 
hyalina Norton 9 19 
kincaidi n. sp. 9 13 
mellina Cr. 9 6 
monilo n. sp. (gall) 31 
nevadensis Cr. ^9 7 
nigrita n. sp. 9 3 
pacilica n. sp. 9 10 
pallicornis Norton ^9 4 
pallifrons Cr. $ 29 
parva Cr. $ 9 2 
pectoralis n. sp. 9 10 
pisnm Walsh $ 9 14 
placenta Norton $ 28 
pomum Walsh $ 9 17 
pyriformis n. sp. (gall) 30 
rcsinicola n. sp. $ 9 9 
robusta n. sp. $ 9 12 
rugulosa n. sp. $ 27 
stigmatalis n. sp. 9 21 
sulphurea n. sp. $ 9 26 
truncata n. sp. 9 20 
1. Pontania cressoni new species. 
Female. — Length 4.5 mm. ; not very robust; clypeus deeply emarginate; 
lobes small, pointed; ocellar basin distinctly defined, breaking rather 
broadly into prominent antennal fovea; antennae normal, third joint 
a little longer than fourth; sheath acuminate, emarginate beneath; 
claws deeply cleft; venation normal, except that outer veins of discal 
cells of posterior wings are interstitial. Color black, shining, including 
pronotum, orbits, and femora; teguhc, mouth parts, tibiae and tarsi pale, 
more or less infuscated, especially at tips of posterior tibia' and their 
tarsi ; wings nearly hyaline; stigma and costa brown, the former hyaline 
at base. 
One female, Washington. (Coll. Am. Ent. Soc.) 
2. Pontania parva Cresson. 
1880. Nemattu parvus Cresson. Trans. Am. Ent. Soc, vm, p. 5. 
Female. — Length 3.5 to 4 mm.; not robust; clypeus shallowly and 
broadly exavated ; lobes short, minute; mouth parts with very long and 
'rather numerous light hairs; lateral furrows of vertex very broad and 
deep ; ocellar basin distinctly defined ; frontal crest indistinct, broken by 
the broad, oval, deeply excavated antennal fovea; antennae very slender, 
joints 4 and 5 as long as or longer than 3; sheath strongly acuminate at 
tip, circularly emarginate beneath, rounded above; cerci tapering; claws 
small, deeply and finely notched, rays almost parallel; venation normal. 
Color black, shining; mouth parts, spot beneath antenna 1 , outer third of 
pronotum, tegulae, apices of coxae, trochanters, and legs for the most part 
yellowish ; upper and lower margins of femora, tips of tibiae, particularly 
