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Insecutor Inscitiae Menstruus 



Vol. Ill JANUARY-APRIL, 1915 Nos. 1-4 



DESCRIPTIONS OF NEW AMERICAN THY- 

 SANOPTERA 



By J. DOUGIvAS HOOD 



One genus and twenty species of Thysanoptera are described 

 in the following pages. Twelve of these are from the United 

 States, three are from Panama, four from Peru, and one from 

 Porto Rico. The finding of five new Heterothrips is worthy 

 of comment as it nearly doubles the number of known species 

 of the family. And the existence in eastern United States 

 of three undescribed species of Chirothrips when only an 

 equal number of species are recorded from that region is also 

 a matter of interest. 



The writer gratefully acknowledges his indebtedness to the 

 many friends and correspondents mentioned in the description 

 below for their painstaking collecting and their generous dona- 

 tion of type material. 



Heterothrips borinquen, new species. (PI. I, fig. 1.) 



female (macropterous). — Length about 1 mm. Color, dark 

 blackish brown, with tarsi, distal ends of tibiae, and third anten- 

 nal segment pale grayish yellow; fore wings dark brownish 

 gray except for a white transverse band just beyond scale. 



Head about 1.7 times as wide as median dorsal length, dis- 

 tinctly shorter than prothorax, widest behind eyes, thence nar- 

 rowing abruptly to eyes and tapering slightly to base; sur- 

 face with a few minute spines, impressed and transversely 

 rugose in front of anterior ocellus, smooth between ocelli, and 

 with four or five anastomozing striae on occiput; frontal costa 

 with deep, U-shaped emargination ; ocellar area delimited by 



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