Hood — Descriptions of New Thysanoptera. Ill 



frontal costa with deep U-shaped emargination ; ocellar area not dehmited 

 by chitinons Hnes. Eyes setose, 0.6 as long as head, as wide as their 

 dorsal interval. Ocelli of posterior pair twice the diameter of anterior 

 ocellus, a little less than half as wide as their interval. Antennae about 

 2.6 times as long as head; segment 3 subconical, about 2.5 times as long 

 as wide, with deep incisions at basal fifth and basal two-fifths ; 4 more 

 than half as wide as long, roundly tapering to base; 5-8 more or less 

 barrel-shaped, with sense cones; 9 a little more than twice as long as 

 wide; segments 1 and 2 nearly concolorous with head; 3 pale grayish 

 yellow, slightly infuscate apically; 4-9 blackish brown. 



Prothorax about one and one-third times as long as head and about 

 1.66 times as wide as long, sides and posterior margin rounded, anterior 

 margin straight; notum with a few short spines, its surface free from 

 sculpture except for two or three anastomozing stride near anterior and 

 posterior margins. Wings of fore pair half as wide at middle as near 

 base, the greatest subbasal width (exclusive of scale) about one-ninth the 

 length of wing; costal margin, anterior vein, and posterior vein with 

 about 32, 26, and 23 short, stout spines, respectively, these being closer 

 together toward base of wing. 



Abdomen stout; pubescence close, disposed on strong, anastomozing 

 lines (much as in H. pectinifer, figured in Ins. Insc. Menstr., Vol. Ill, 

 1915, PI. I, Fig. 7, but even closer); posterior margins of abdominal 

 tergites 1-7 fringed at sides with contiguous, chitinous scales or plates, 

 whose apical margins are evenly produced in long, slender spines, giving 

 a comb-like appearance; median line of tergite of segment 1 with a few 

 minute spines on posterior margin ; segments 2-5 with a few slender 

 spines at middle of posterior margin ; 6 and 7 with a regular fringe of 

 stronger spines between the lateral plates; sternites 2-6 fringed across 

 their entire posterior margins with chitinous plates, which are divided 

 apically into about ten slender spines. 



Measurements of holotype: Length 1.26 mm. ; head, length 0.114 mm., 

 width 0.156 mm.; prothorax, length 0.156 mm., width 0251 mm.; ptero- 

 thorax, width 0.305 mm.; fore wing, length 0.816 mm., width at base 

 0.090 mm., at middle 0.045 mm. ; abdomen, width 0.372 mm. 



Antennal segments: 12 3 4 



Length (m) 27 42 69 48 



Width (m) 31 29 27 29 

 Total length of antenna, 0.302 mm. 



Described from 5 females taken in flowers of Azalea nudiflora L. , at 

 Beltsville, Maryland, May 2, 1915, by W. L. McAtee and L. 0. Jackson. 



This species bears a close resemblance to H. arisxmse, but may be 

 known by the curved lateral margins of segment 4 of the antennse; the 

 greater width of segment 5, which is distinctly more than half as wide 

 as 4 ; the shorter and stouter terminal antennal segment ; and the rather 

 closely pubescent abdomen. The male, when discovered, will of course 

 be found to lack the finger-like chitinous processes of the ninth tergite, 

 which occur in analis and vitis. 



