SPRING NUMBER val 
Mitchell, Evelyn Groesbeck, 1907, Mosquito Life. 
Quayle, H. J., 1906, Mosquito Control. California Agricultural Experi- 
ment Station Bulletin 178. 
Smith, John B., 1901-1911, Reports of the Entomologist for 1901-1911. 
New Jersey Agricultural Experiment Station. 
Smith, John B., 1908. The House Mosquito, A City, Town, and Village 
Problem. New Jersey Agricultural Experiment Station Bulletin 246. 
Theobald, F. V., 1901, Monograph of the Culicidae, or Mosquitoes. 
Official Publication of the British Museum, London. 
Van Dine, D. L., 1906, Mosquito Control. The Introduction of Top 
Minnows in the Hawaiian Islands. Hawaiian Station Report Press 
Bulletin 20. 
KEY TO NORTH AMERICAN SPECIES OF PHYSOTHRIPS 
(Continued from page 32) 
The genus Physothrips is part of the old genus Huthrips which name 
Karny (1909) has shown should be applied to the genus Anaphothrips. 
The species formerly included under Huthrips are now divided between 
four genera which may be separated by the following key: 
1. Tibia with a strong, curved spine on the end....._.... Odontothrips Serville 
2. Tibia without such a spine. 
aaWwines withetransverse bands. ......2-_-cc-nc0sn-escncneece Taeniothrips Serville 
aa. Wings without transverse bands. 
b. Bristles on the fore angles of the prothorax conspicuous. 
Frankliniella Karny 
bb. Bristles on the fore angles of the prothorax not conspicuous. 
Physothrips Karny 
KEY TO THE NORTH AMERICAN SPECIES OF PHYSOTHRIPS 
(Adapted from Jones, 1912) 
1. General color white to light yellow or orange. Head noticeably wider 
than long. 
a. Last two segments of antennae rather long and slender, and to- 
gether about 2-3 as long as segment 6. Wings shaded brown except 
Taverne Joes Giavel ey oe ee ere P. orchardii (Moulton) 
aa. Last two segments of antennae not long and slender, about 1% as 
long as segment 6. Wings not shaded brown. 
b. Ring vein and longitudinal veins conspicuous. Wings dilute 
SLO a a eee P. costalis (Jones) 
bb. Ring and longitudinal veins not conspicuous. Wings white. 
P. albus (Moulton) 
2. General color brown. 
a. Head nearly as long as wide; no prominent bristles in front of 
OSCERIORMOCelee eee Re eo P. longirostrum (Jones) 
aa. Head noticeably wider than long; a prominent spine in front of each 
posterior ocellus. 
b. Eyes not pilose; postocular bristles present; antennal segments 
3 and 4 not pedicellate; posterior longitudinal vein of fore wings 
ULE) OV TSS SOT OVS SUs ce ie ele a Re ne eee P. ehrhornii (Moulton) 
bb. Eyes sparsely pilose; post-ocular bristles absent; antennal seg- 
ments 3 and 4 pedicellate; posterior longitudinal vein with 11 or 
eer ap Teen se crea th hs oy ol eA ee ee Ou ta P. blacki n. sp. 
