130 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvi. 



wheat early in the season and afterward passed to later-flowering 

 plants, such as tansy {Tanacetum vulgare). Webster found it common 

 in all stag-es on buckwhcnit in Ohio. 



Thaxter believed that this species caused the rust of oats in Con- 

 necticut. Davis has reported it as the most common species on the 

 heads of clover in Michigan, and found it both in and out doors on 

 man}' plants. 



iEOLOTHRIPS BICOLOR, new species. 

 Plate I, figs. 4-9. 



Female.— ljQngt\ l.Umni.; width of mesothorax, 0.29 mm.; width 

 of abdomen, i>.38 nmi. General color light yellowish brown to dark 

 brown. 



Head as wide as long, also as long and as wide as prothorax; cheeks 

 slightly arched behind eyes; anterior margin slightly arcuate; occiput 

 transversely striated, quite thickly clothed with minute spines. Eyes 

 large, black, elongated downward, coarsely granulated, each facet dis- 

 tinct, slightly pilose; ocelli separated, bright reddish yellow^, mar- 

 gined inwardly with maroon crescents. Mouth cone sharp; maxillary 

 palpi three segmented, geniculate, third segment very small; lal)ial 

 palpi four segmented, first segment very short. Chitinous thickening 

 around left eye connected with that uniting mouth cone to frons; only 

 a short vestige of such thickening below right eye; two long, slender 

 spines are borne upon frons in front of the middle of the transverse 

 thickening and one cquall}' long spine upon middle of labrum; these 

 spines are man}^ times as long as an}^ others upon the head. Antennae 

 as long as head, pro and mesothorax together, slender, filamentous, 

 approximate at l)ase; relative lengths of segments as follows: 



Segment one thickest, as long as wide; three to six slightly nar- 

 rower than two; seven to nine tapering; the last very minute and 

 conical. All segments, except three, of uniform brown color; three 

 is very pale yellowish white, except brown band around apex; two is 

 brown at base fading to light yellowish at apex. Segments three to 

 nine quite evenly clothed with fine hairs of uniform size; three and 

 four bear each a narrow, light-colored, membranous strip on outer 

 part of underside, indistinct upon three on account of its light color; 

 a small elliptical spot of similar structure near tip of five beneath. 



Prothorax nearly square, slightly constricted in middle, with num- 

 erous miiuite spines, l)ut none conspicuous. Mesonotum transversely 

 striated; fore angles of mesothorax broadly rounded. Metanotum 

 reticulate; metathorax tapering posteriorly. Wings broad, rounded 

 at tips; fore wing with two longitudinal veins which bend outward 



