IOWA ACADEMY OP SCIENCES. 
199 
f. Length three and one-half mm. or over, ven- 
tral segment of female, with four black, 
comb-like teeth, male plates broad, almost 
truncate; species brownish fuscous above.. 
pectinatus. 
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 cinereus above dbbreviatus. 
cc. Elytra shorter, broadly obtusely rounded, with the two outer 
apical veinlets short, at nearly right angles to the costa, third vein- 
let running distinctly to the posterior margin; species stout bodied, 
with chocolate brown markings. 
d. Vertex 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, claval 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 than 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 configuratus. 
BB. Pronotum 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 adjacent cells, equaling or shorter 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 sylvestris. 
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