78 Bulletin of the Brooklyn Entomological Society Vol.X 



This insect has been known to the writer for two or three 

 years, and has been observed in many parts of Maryland and 

 Virginia, always on chestnut, where it can be looked for with 

 invariable success on the under surface of the leaves. It is prob- 

 ably distinct from the sixteen or so species of Liothrips known 

 to occur north of Panama; but it must be said that our present 

 characters for the separation of species in this group leave much 

 to be desired, though each form appears to be restricted more or 

 less completely to a certain plant. 



Liothrips leucogonis sp. nov. 



Female (macropterous) . — Length about 1.6 mm. Color dark blackish 

 brown or black; antenna! segments 1-3 yellow, shaded slightly with gray 

 and brown ; inner surface of all femora white at apex ; fore wings with an 

 almost obsolete brown streak in basal third. 



Head very slightly longer than wide, broadest at middle, cheeks gently 

 arched, slightly convergent posteriorly; vertex slightly and roundly pro- 

 duced in front of eyes, the anterior ocellus overhanging the insertion of 

 antennae; dorsal and lateral surfaces closely roughened with transverse 

 lines and set with several short spines ; postocular bristles four-fifths as 

 long as eyes, blunt but not expanded at apex. Eyes slightly more than 

 one third as long as head, not protruding. Posterior oceUi sHghtly behind 

 anterior fourth of eyes. Antennae about 2.1 times as long as head, of the 

 general form and structure common to the species of the genus ; sense 

 cones small, formula : 3, o-i ; 4, 1-2''^ ; 5, 1-1+^ ; 6, i-i'^^ ; 7 with i on dorsum 

 near apex; color of antennae: segments 1-3 yellow, shaded slightly with 

 gray or brown along inner surface ; 4-8 blackish brown, 7 and 8 uniformly 

 so, the others more or less marbled with yellowish and darkest along their 

 inner surface. Mouth cone rounded, about attaining base of prosternum. 



Prothorax about 0.62 as long as head and (inclusive of coxae) about 2.5 

 times as wide as median dorsal length ; all bristles present, blunt but not 

 expanded at apex, the two pairs on the anterior margin subequal and half 

 as long as the postoculars, and slightly shorter than the coxal and mid- 

 lateral pairs ; posterior marginal pair about equal to postoculars, and decid- 

 edly shorter and somewhat more slender than the conspicuous posterior 

 angulars. Pterothorax much wider than prothorax, sides slightly arcuate, 

 convergent posteriorly. Wings long, closely fringed, of nearly the same 

 width throughout ; fore pair with a very faint, brownish, median streak in 

 basal third, and with about 12 accessory hairs ; hind wings clear. Fore 

 tarsi unarmed. 



Abdomen of normal form, rather large and heavy, and wider than ptero- 

 thorax. Tube about three fourths as long as head and about 2.2 times as 

 long as basal width, which is sHghtly less than twice the apical. Lateral 



