202 PROCEEDINGS OF THE NATIONAL MUSEUM. 



Male.— Jjcngth alumt tive-sixths that of female; head and prothorax 

 lUMirlv as loi»o- as in IVinalc; relative lengths of antennal seo^ments as 

 follows: 



1 ^ 3^ ^ 5_ 6_ 7 8 

 10 11 16 M 1?>.8 11. S 10.5 9.5 



Abdomen only about four-fifths as long- or as Itroad as in female and 

 tapering- more uniformh' from base to tip. 

 Described from two specimens. 

 Ootf/jje.— Cat. No. 6383, U.S.N.M. 

 Food jyhmt.—TsLki^n in turf. 

 //aZ»/to/.— Amherst, Massachusetts. 



EURYTHRIPS, new genus. 



Head as long- or somewhat longer than wide, narrow^ed in front. 

 Eyes small and vertex between them elevated. Antennj\^ fully twice 

 as long- as the head and thicker than in most species. ' Prothorax 

 about two-thirds the length of the head. Fore tarsi with a small 

 tooth, which is larger in the male than in the female. Wings usually 

 reduced to short pads. Abdomen unusually large and heavy in pro- 

 portion to the rest of the body. Males with a closely lying scale at 

 the base of the tube. 



The species amjyliventrali.s is the type of this genus. 



{svpvg^ broad; Opiip.) 



The two species belonging to this genus may be separated by the 

 breadth of the abdomen, which in avi2>llveiitrali'< (p. 20:2) is about one 

 and two-thirds times as wide as the pterothorax, while in osborni (p. 203) 

 it is only about one and one-fourth times as wide as the pterothorax. 



EURYTHRIPS AMPLIVENTRALIS, new species. 



Plate IX, figs. 99-101. 



Female.- — Length 1.08 mm. (1 to 1.20 mm.); width at middle of 

 pterothorax 0.24 mm. (0.22 to 0.25 mm.). General color of head and 

 legs clear yellow to brownish yellow; body shading posteriorly to dark 

 brown beyond middle of abdomen. 



Head slightly longer than wide, slightly narrowed in front, broadest 

 at neck; cheeks diverging gradually behind the ej^es; vertex drawn 

 out into a hump between and in front of the eyes; post-ocular bristles | 

 quite long; head clear, brownish yellow with some red hypodermal ' 

 pigment on vertex. Eyes extremely small and composed of but very 

 few large facets, slightly protruding, oval in outline, Idack; oc(dli 

 wanting. Mouth cone short and blunt; labrum not constricted bej^ond 

 middle. Antennae approximate, large, and heavy, fully twice the 

 length of the head, with peculiar, semicircular, shelf-like support 

 visible on under side at base: i-elative lenu-ths of seo-ments as follows: 



