OF WASHINGTON, VOLUME XIV, 1912. 129 



DESCRIPTIONS OF NEW NORTH AMERICAN 

 THYSANOPTERA 



BY J. DOUGLAS HOOD, 

 United States Biological Survey . 



The classification of the order Thysanoptera is admittedly 

 much in need of attention, and reliable synopses of genera and 

 species are conspicuously wanting. A proposed treatise for 

 the Genera Insectorum, now in preparation by Richard S. 

 Bagnall, will do much to supply these long-felt wants; and in 

 advance of its publication it seems desirable to make known 

 a maximum number of so-called species, for the value of such 

 a work of reference depends largely upon its exhaustiveness. 

 In this paper I have thus attempted nothing more profound 

 than the mere description of certain forms and groups of forms 

 which appear after a morphological study to require new names 

 for their proper designation. 



SUBORDER TEREBRANTIA HALIDAY. 



FAMILY ^EOLOTHRIPID^ HALIDAY. 

 yEolothrips vittipennis, new species. (PI. IV, figs. 1, 2.) 



Female. Length about 1.5 mm. Color dark blackish brown with a 

 reddish cast, due to dense crimson hypodermal pigmentation in the tho- 

 rax, abdomen, femora, tibiae, and the two basal antennal segments; anten- 

 nae with segnent 3 and basal half of segment 4 yellowish white. 



Head about as wide as long, longer than prothorax, deeply and closely 

 transversely striate, and with numerous minute spines on occiput and cheeks ; 

 anterior border deeply emarginate' by the forward production of the eyes, 

 and wii'h a median tubercle; cheeks strongly arcuate. Eyes moderate, 

 prolonged on ventral surface of head, and with the more dorsal facets 

 separated by a distance about equal to their own diameter. Ocelli equi- 

 distant, the posterior nearly contiguous to eyes. Antennee about 2.2 times 

 as long as head, the last four segments subequal and together shorter than 

 the preceding; sensory area on ventral surface of segment 5 elongate, the 

 sense cone arising from basal end; segment 3 yellowish white, becoming 

 darl- blackish brown at extreme apex; 4 yellowish white in basal half or 

 thirl, excepting for the dark pedicel; remainder of antenna blackish brown. 

 Madllary palpi three-segmented; labial palpi four-segmented. 



Frothorax subrcetangular, slightly shorter than head, and nearly one 

 and one-half times as wide as long, widest near middle; surface with num- 

 erous minute spines. Mesothorax about 1.5 times as broad as prothorax, 

 arterior angles broadly rounded; mesoscutum very closely transversely 

 striate. Metathorax with sides roundly converging posteriorly; meta- 

 ffiutum subreticulate. Wings of fore pair slender, about 8.5 times as long 

 is width at middle, of nearly equal breadth throughout; venation normal; 

 inal Half occupied by a longitudinal black band which extends from the 



