32 THE FLORIDA BUGGIST 
A NEW PHYSOTHRIPS FROM OREGON 
J. R. WATSON 
A small collection of thrips collected by Prof. A. Burr Black 
and sent to the writer contains specimens of an apparently un- 
described species. 
Physothrips blacki, n. sp. 
2. General color brown, a slight tinge of orange on the thorax of some 
specimens. 
Measurements: Total length 1 mm. Head length .09 mm., breadth 
0.15 mm.; prothorax: length 0.13 mm., breadth (including coxae) 0.17 mm.; 
mesothorax: breadth 0.24 mm.; metathorax: breadth 0.21 mm.; abdomen: 
breadth 0.26 mm. Total length on antennae 0.22 mm. Segment 1, 25; 
2, 835°3,.005 4,:36.0500,/02.03.0, 425° 7,71 5,5, | famicrons: 
Head considerably wider than long; cheeks slightly convex, sparsely 
hairy; vertex with several very distinct cross striations; no large post- 
ocular bristles, but a row of 8 small bristles extends across the vertex 
behind the eyes; a long spine in front of each posterior ocellus. Hyes 
large bright red by reflected light, occupying over half the length of the 
head and two-thirds the breadth, sparsely pilose, facets large. Ocelli very 
large, posterior margins of the posterior pair even with and near the 
posterior margins of the eyes, bordered on the inner sides by heavy pig- 
mented crescents. Anterior cellus directed partly forward, bordered poste- 
riorly by a large pigmented area. Mouth-bone long and pointed, reaching 
nearly or quite across the prosternum. Antennae 8-segmented, 1 and 2 
almost as dark as the head, 2 often darker than 1; 3 and the base of 4 
light-brownish yellow, remainder light brown. Spines and sense cones short 
and colorless but some of the latter heavy. 
Prothorax squarish, sides slightly convex and diverging posteriorly. 
Posterior angles rounded and provided with a pair of heavy bristles. The 
anterior angles bear only very short bristles. Mesothorax with very convex 
sides, no large bristles. Metathorax with sides nearly straight and parallel. 
Legs rather long, except for the lighter tarsi, nearly concolorous with the 
body. Fore legs often lighter than the others. Fore wings light brown; 
veins bearing prominent bristles; 11 or 12 on the fore vein, 8 or 9 near the 
base, 2 in the center and one near the apex; 11 or 12 on the posterior vein, 
none on the base; fringing hairs stout but rather short and sparse. Hind 
wings colorless. 
Abdomen elliptical, tapering acutely to the base. Spines short on the 
anterior segments and those on the posterior less than % the greatest 
width of the abdomen. 
é Smaller than the female. Some specimens are considerably lighter in 
color, especially the antennae and legs. The latter are sometimes yellow. 
Abdomen widest at the base; well rounded posteriorly. The last seg- 
ment bears several pairs of strong but short bristles. 
Measurements: Total body length .87 mm.; head: length .086, breadth 
134 mm.; prothorax: length .107 mm., breadth .155 mm.; mesothorax 
.202 mm.; abdomen: width at base .156 mm.; antennae: total length .187; 
sepment i183" 2,.30% 3, 343 4, 34-75; 2886.59") 7, Os) Oo, 1 2eoemicrons: 
Described from six females and 12 males collected from California poppy 
and dandelion at Corvallis, Oreg. . 
