198 ' in nds A New Tobacco Th.rips. 



Euthrips nicotianae sp. nov. 



Average length, 1.05 mm. (0.95 to 1.13 mm.) ; average breadth at middle 

 of abdomen, 0.27 mm. (0.225 to 0.285 mm.). General color of head and 

 thorax light brown or tawny yellow-brown ; abdomen dark brown. 



Head about one and one-half times as wide as long, frequently slightly 

 retracted under anterior margin of prothorax ; occiput transversely wrin 

 kled, posterior margin strongly thickened and darker in color ; anterior 

 margin slightly bisinuate; cheeks approximately straight and parallel. 

 Eyes dark red in color, not protruding, occupying together fully one-half 

 the width of the front of the head and being one-half as long as the head; 

 margins around eyes" pale yellow in color; surface of eyes finely facetted 

 and slightly pilose ; three ocelli present, well separated, posterior ones con 

 tiguous with yellow borders to eyes, pale yellow in color and margined 

 inwardly with pale orange crescents ; one moderately stout, dark spine in 

 front of each posterior ocellus ; postocular spines weak and inconspicuous. 

 Mouth cone reaching nearly to posterior edge of the prosternum, tapering 

 abruptly; maxillary palpi slender, three segmented. Antennae inserted 

 slightly below front margin, approximate at base, about two and one-half 

 times as long as the head and approximately equal to breadth of meso- 

 thorax ; relative length of segments : * 



12345678 

 6.2 11.4 13.5 13.6 12.2 16.2 3.0 4.5 



Segment 1 is rounded, three-fourths as long a$ broad ; 2 is as broad as 1 ; 

 following segments about three-fourths as thick ; segments 3 to 6 are con 

 stricted at bases, becoming more stout successively. Color of segments 1 

 and 2 uniform light brown ; 3 to 5 pale yellow at bases, shading to brown 

 at outer ends, each succeeding segment from 3 to 6 becoming darker in 

 color ; 6 to 8 are dark brown. Spines upon segments 2 to 5 are of medium 

 size, but not very conspicuous. Color of head varying from gray-brown 

 to yellow-brown. 



Prothorax about five-ninths as long as broad and slightly longer than 

 the head ; sides rounded, slightly wider at hind than at fore angles ; one 

 stout spine at each anterior, and two stouter spines of equal size at each 

 posterior angle ; anterior marginal pair of spines about one-half as long as 

 those at front angles ; usual row of five spines on each side of hind margin, 

 of which number four is equal in strength to those on the front margin. 

 Mesothorax nearly one and one-third times as wide as the prothorax, 

 broadest posteriorly, sides curving outward ; mesonotum without conspic 

 uous spines, posterior margin forming an obtuse angle in middle. Meta- 

 thorax slightly narrower than mesothorax, sides nearly parallel, broader 

 than prothorax at posterior edge ; metanotum bears two pairs of spines at 

 front edge, the inner pair being as strong as those at front angles of pro- 

 thorax. Wings present (probably reduced at some season of year), average 

 length about 0.68 mm., not reaching to the tip of the abdomen, breadth 



*The number of the segment is given above the line and below it the number of 

 spaces covered upon an eye-piece micrometer by an average of the segments of 10 

 antennae. 



