NO. 1310. NORTH AMERICAN THYSANOPTERA—HINDK 205 



coii.siderably enlarged and tooth upon tar.sus quite stout. Abdomen 

 more slender than in females and tapering more g-raduall3\ 



Described from five males, all short winged. 



Cotype.—Ciit. No. 6335, U.S.N.M. 



Food i^lan U. — G rasses , 



Ildhitat. — Amherst, Massachusetts. 



This species is named for Prof. Herbert Osborn, who has for many 

 years shown consideralilc interest in the study of tluvse tiny insects. 



Genus CRYPTOTHRIPS UzeU 



Head cylindrical, fully one and one-half times as long as wide. 

 Eyes large and prominent. Vertex strongh^ elevated and bearing the 

 anterior ocellus at its extremity. jSIouth cone about as long as its 

 breadth at base and reaching al)out two-thirds across the prostcrnum; 

 labrum ])lunt. Prothorax al)Out as long as width of head. Legs 

 slender; fore femora l)ut slightly enlarged; fore tarsi unarmed. Wings 

 present, slighth^ narrowed in middle. Male with a scale at ])ase of 

 tube. 



I iind only one species belonging to this genus, asjyer.'^Hs. 



CRYPTOTHRIPS ASPERSUS, new species. 

 Plate X, figs. 104-10(3. 



Feindh'. — Length l.^iS mm. (1.45 to 2 mm.); width of mesotliorax 

 0.32 mm. (0.28 to 0.36 mm.). General color yellowish l)rown to brown- 

 black; body and legs considerably marked with irregular, dark-pur- 

 plish, hypodermal pigmentation. 



Head cylindrical, one and one-half times as long as wide, about as 

 wide as length of prothorax; cheeks almost straight and nearly parallel, 

 set with a few minute, slender spines; postocular l)ristles short; sur- 

 face of head linely cross-striated. Eyes quite large, finely faceted, 

 very slighth^ protruding, dark-purplish red with pale yellowish inner 

 margins; ocelli present, small and inconspicuous, frequenth^ concealed 

 by local hypodermal pigmentation, situated far forward; posterior 

 ocelli close to margins of e3'es, front one on apex of prolonged vertex 

 of the head. Mouth cone rather short, reaching only to middle of 

 prosternum; maxillary palpi long and slender; sides of labrum straight, 

 its point l)lunt. Antenntv inserted l)elow vertex, approximate at base, 

 slightly moi-e than one and one-half times as long as the head, quite 

 slender; relative lengths of segments as follows: 



Segments one and two concolorous with head; three pale j^ellow; 

 rest of antenna shading graduallv to dark brown at tip, except bases 

 of four and tiv(% which are pale yellow; spines and sense cones short 

 and inconspicuous. 



