NO. 1310. NORTH AMERICAN THYSANOPTERA— HINDS. 203 



Seei'mont one is ])roadest. cyliiKlriciil. and followino- sot»-nionts docroaso 

 gradually in dianiet(>r; throe is (•laval(\ four to soaimi each barrel- 

 shaped, with a short stalk. AntxMinal segments shade iiradiially from 

 coneolor(nis with head at base to very dark brown at tij); si)ines and 

 sense eones very long-, slender, and (luite prominent. 



Prothorax quite variable in length, but averag'ing slightly more than 

 two-thirds as long- as head; width also uniisuallv variable. l)ut averag- 

 ing twiee its length and equal to width of pterothorax. Anterior 

 marginal spines wanting; others present, moderately long, blunt, but 

 not knobbed. Pterothorax very small, rather shorter than prothorax 

 and usually slightly narrower. Wings reduced to mere pads. Fore 

 and middle legs rather short and thick, ])ut hind legs ([uite long and 

 slender; fore femora 1)ut slightly thickened and tarsi ariu<^d with a tiny 

 tooth. Legs concolorous with head; femora shaded somewhat with 

 ))rown, l)ut without hypodermal pigment. 



Abdomen exceedingly large and heavy, about one and two-thirds 

 times as ])road as pterothorax; posterior half rounding up to base of 

 tube. Tube fully two-thirds as long as head and almost one-half as 

 broad at middle as it is long; sides straight and tapering evenly; 

 terminal hairs slightly shorter than tul)e; spines on sides of altdomen 

 quite long and prominent. 



Prothorax concolorous with head, but much more sufiused with 

 irregular, l»right red hypodermal pigmentation. (Seen by reflected 

 light on white background.) Pterothorax and base of abdomen more 

 shaded with brown, and the latter becoming darker toward tip, where 

 it is dark brown or almost black. Pterothorax, and sides of abdomen 

 especially, thickly marked with bright red hypodermal pigment. 



Descriljed from five females. 



C<>ty2>e.^OAi. No. 6334, U.S.N.M. 



Male unknown. 



Food plant. — Taken in turf in fall. 



Ilahttat. — Amherst, Massachusetts. 



EURYTHRIPS OSBORNI, new species. 

 Plate X, figs. 102, 103. 



Female. — Length 1.V2, mm. (1 to 1.22 nuu.); width of mesothorax 

 0.27 nun. (o.25 to 0.30 nun.). General color light yellowish brown to 

 dark brown; head and legs yellow. 



Head approximately as long as wide, narrowed in front; the antenna' 

 standing upon a triangular projection between the eyes; head enlarged 

 ([uite abruptly l)t>hind the eyes; cheeks not converging posteriorh\ 

 Eyes ver}^ small, depressed, finely faceted, almost oval in outline, 



