XO.2008. NEW SPECIES OF THYSANOPTERA— MORGAN. 23 



THRIPS HELIANTHI, new species. 



Figs. 44; 47-49. 



Female. — Length, 1.05 mm. (1.07 to 1.02); width, about one-fourth 

 the length. Color: thorax, yellowish brown, rest of body dark brown 

 varying to light brown in some specimens. 



Head one and one-half times as \\dde as long; cheeks slightly arched 

 behind the eyes; front produced between the antennae; occiput very 

 distinctly cross striated ; a small spine in front and a sunilar one behind 

 each posterior ocellus, a row of six small spines extending in a curved 

 line from the spine behind the posterior ocellus behind the compound 

 eye to the lateral margin of the head; eyes not protruding, coarsely 

 granulated, black by reflected light, dark purplish by transmitted 

 light, sparsely pilose; ocelli well separated, the posterior ones cephalad 

 of the hind margins of the eyes, not contiguous with the borders of 

 the eyes, larger than the facets of the eye, color light yellow, mar- 

 gined inwardly with dark reddish crescents; maxillary palpi three- 

 segmented; first and third segments of equal length, the second 

 shorter. Mouth cone reaching nearly to hind edge of presternum. 

 Antennee seven-segmented, two and one-half times as long as the 

 head ; relative lengths of the segments as follows : 



6 9.1 12 11.6 10 14.4 5.4 



Segment one cylindrical; two barrel-shaped; three to five peduncu- 

 late — three and four strongly, five weakly so— elongate ovoid; five 

 joined by a moderately broad surface to base of six which tapers 

 considerably from its middle to the apical end ; seven tapers some- 

 what, blunt at the apex. Segments one, two, six, and seven dark 

 brown; three and four pale brown; five dark brown, except the base 

 which is somewhat lighter. Spines upon antennae conspicuous, par- 

 ticularly so upon segment two. All spines brown, but shading from 

 dark brown upon basal segments to light brown upon apical seg- 

 ments. Segments three and four each bear a branched sense cone 

 near the tip, on upper side of three and on under side of four. 



Prothorax rectangular, as long as the head and about three-fifths 

 as long as wide; posterior portion of pronotum distinctly transversely 

 striated; pronotum clothed with a number of small spines; each hind 

 angle bears a pair of stout conspicuous spines; between these pairs 

 along the hind margin of the pronotum stands a row of three smaller 

 spines on each side, the inner spine being the strongest. A row of 

 three spines on each side parallels the row upon the hind margin, the 

 outer spine of which is cephalad of the two spines upon the hind 

 angle, the inner cephalad of the last spine in the marginal row. 

 Three short spines stand upon the front angles of the prothorax. 

 Mesoscutum distinctly and finely transversely striated, bearing a 



