IOWA ACADEMY OF SCIENCES. \QQ 



i. Length three and one-balf mm. or over, ven- 

 tral segment of female, with four black, 

 comb-like teeth, male plates broad, almost 

 truncate; species brownish fuscous above.. 



pectinatiis. 



ff. Length, three mm. or less, ventral segment 

 of female with a broad median projection 

 slightly notched in the middle, arcuated 

 either side, male plates roundingly pointed; 



species light clnereus above abhreviahis. 



cc. Elytra shorter, broadly obtusely rounded, w th the two outer 

 apical veinlets short, at nearly right angles to the costa. third vein- 

 let running distinctly to the posterior margin; spec'es stout bodied, 

 with chocolate brown markings. 



d. ^^ertex slightly longer than broad; species not over three 

 and one-half mm. in length, short and stout, with a distinct 

 marking. 



e. Dark chocolate brown above, nearly black below, a 

 distinct Inverted T on apex of front, clavil sutures 

 reticulate, central anteapical, cell divided; male 



valve large, Inflated ocellaris. 



ee. Light brown above and below, no reticulations 

 on clavus, central anteapical cell entire, male 

 valve normal, not larger tlian ultimate seg- 

 ment sayi. 



dd. Vertex very broad, breadth and length about equal ; spe- 

 cies over four and one-half mm. long, markings brown- 

 ish fuscous or wanting, male plates broad, short, obliquely 



truncate conliguratus . 



BB. Prouotum longer, hardly twice broader than long, posterior angles 

 strong, sides short, postero-lateral margin nearly parallel with scutellar 

 margin of elytra, elytra long with appendix, costal veinlets never 

 reflexed, only the first one. ever even right angled; species unicolorous, 

 yellows or fuscous, larvae unicolorous. 



c. Elytra only slightly overlapping at tip. Central ateapical cell 

 neither markedly constricted nor extending posteriorly much 

 beyond the ao jacent cells, equaling or sliorter than outer dis- 

 coid cell. 



d. Elytra distinctly green. Vertex lighter, not distinctly 

 lined, tergum and venter and sometimes all of lower side 

 of face varying to black. 



e. Form stout; length four mm. or over dehilis. 



ee. Form more slender; species three mm. or less in 



length minimus. 



dd. Elytra not distinctly green, hyaline yellowish, or with 

 the nervures fuscous margined; vertex unicolorous or 

 lined, not spotted. 



e. Male valve enlarged, inflated, rounding posteriorly 

 concealing all but the tips of the small plates; 



female segment slightly angularly excavated. 



meUcheimeri. 



ee. Male valve normal, less than half the length of the 

 plates, last segment in female produced more or 

 less notched. 



f. Species distinctly yellow, male plates not 



longer than broad oculatus. 



ff. Species fuscous or greenish, with fuscuous 

 markings, male plates distinctly longer than 

 broad. 



g. Vertex acutely angled; species green, 

 with slight fuscous markings; male 

 valve pointed, female segment with 

 truncate process sylve^tris. 



