1908] Neiv species of Idolothrips 287 



more bulging than in female, the head flaring out to receive them. Antennas 

 slightly less than 1.4 times as long as head (usually about 1.38). 



Prothorax slightly longer than greatest sub-basal width of head. Fore 

 femora usually as wide as, or slightly narrower than, head, armed, on basal half 

 of outer surface with about seven prominent, stout, black, and nearly equidistant 

 spines, and on outer surface near apex with a long, stout, downwardly-hooked 

 spine; fore tarsi provided either with a long and \'cr\ stout straight tooth or 

 with a shorter and much more slender curved one.* 



Abdomen more slender than that of the female, slightly narrower than 

 pterothorax, and about five times as long as wide; tapering evenly from base 

 to tube. Tube about .65 as long as head, and excepting a short basal widening, 

 tapering evenly to apex. 



Measurements: — Total length 3.3-3.9 inm. ; head, length .00 mm., width 

 .218 mm.; prothorax, length .224 mm., width (including coxre) .45 mm.; ptero- 

 thorax, width .52 mm.; abdoinen, width .51 mm.; tube, length .37 mm., width 

 at base .101 mm,, at apex .059 mm. Antenn;ij 1, 53/(; 2, 75/(; 3, 173/t; 4, 151ju; 

 5, 136,«; 6, 107/«; 7, 75/(; 8, 78/t; total .84 mm. ; width 42/(. 



Described from eight females and eight males, all from Illi- 

 nois, as follows: Carbondale, May 19, June 20, in galls of Gnori- 

 moschema gallassolidaginis on Solidago canadensis (C. A. Hart, 

 J. D. H.) ; Havana, June 27, in miscellaneous sweepings (C. A. H.) ; 

 Pulaski, May 24, in woodland sweepings (C. A. H.) ; Urbana, 

 Aug. 7, on Plantago rugelii (J. J. Davis). 



This species is closely related both to I. africana Trybom and 

 I. coniferarum Pergande. From the former, it may easily be 

 distinguished by the shape of the tube, which is fully four times 

 as long as its greatest basal width, while in africana the tube is 

 "am Grunde ein Drittel so breit wie lang." From coniferarum, 

 of which Dr. Hinds gives four figures, it differs most noticeably 

 in the shape and length of the head, the length of the vertical 

 and postocular bristles, and in the form of the antennal segments. 

 The male of armatus, furthermore, has a strong, hooked sub- 

 apical spine on the outer surface of the fore femora, in addition to 

 the stout and nearly equidistant spines which have suggested 

 the species name. 



Idolothrips tuberculatus sp. nov. (fig. 9, 36; fig. 10). 



Female. — Length 3.8-4.3 mm. Color coal black, without markings; antennal 

 segments 3-6 yellow basally; tarsi and apices of tibite brown. 



Head slightly more than twice as long as wide, slightly narrowed iust behind 

 eyes and at extreme base, widest across eyes; dorsal and lateral surfaces finely 

 striate; cheeks with many prominent, stout, black spines, of which a postocular 

 and a sub-basal pair are usually longer; vertical bristles shorter than the post- 

 ocular, wiiich are about equal in length to eyes; vertex conical, produced, apex 

 overhanging insertion of antennae. Eyes large, prominent, bulging, fineh^ 

 faceted. Ocelli moderate, their diameter about twice as great as that of facets 

 of eyes; anterior ocellus occupying extreme vertex; posterior ocelli opposite 

 anterior third of eyes and slightly removed from their inner margins. Antenna; 

 slender, eight-segmented, about one and one-half times as long as head ; segments 



*The size of the tarsal tooth apparently depends upon the degree of enlarge- 

 ment of the fore femora. 



