212 
IOWA ACADEMY OP SCIENCES. 
below than in minimus; gense long, not distinctly angled outwardly. Ely- 
tra narrower than in dehilis, venation similar, outer anteapical cell short, 
rounding; ultimate ventral segment of female short, truncate behind, 
usually medially depressed, giving it a strongly, angularly excavated 
appearance; male valve large, inflated, rounding posteriorly, concealing 
all but the tip of the short plates. Color varying from pallid, with sub- 
hyaline elytra to fuscous, with heavily fuscous margined elytra! nervures; 
tergum venter and male genitalia black; length, 3.75 mm. 
Larvae, form of those of inimicm^ nearly; vertex longer than broad, defi- 
nitely angled; body stout; abdomen short; color light yellow, much lighter 
than the dorsal color in inimicus, without markings of any kind. 
This is a widely distributed and well known species, occur- 
ring in immense numbers on blue grass in lawns and open pas- 
tures, and frequently met with in various other open situations, 
never occurring, however, very far within the margin of shaded 
areas, where it gives place to sayi and AtJiysanus curtisii. 
Work was not commenced early enough to determine fully 
the life-history, but broods the past season were recognized on 
blue grass as follows : Adults from the middle of May until 
the last of June; larvae from the first week in June till the 
middle of July; adults from the first week in July through 
August; larvae through August until the middle of September; 
adults from the middle of September through the season. 
It is the only American representative of a series of species 
with enlarged male valve and concealed plates, and is thus ren- 
dered very distinct in our fauna. The closest allied form seems 
to be the European D. striatus L , with similar recorded habits. 
DELTOCEPHALUS OCULATUS N. SP. 
(PL xxiil, Fig. 4.) 
Form and size vary close to that of melscJieimeri^ slightly 
smaller, resembling the European D. metrius Plor in size and 
color, but with a sharper vertex. Length, 3.50 mm. Width, 
.90 mm. 
Vertex variable, at least one-third longer than broad, one and one-half 
times length next eye, convexly pointed; front broad, straight margined; 
genas arising from the outer corner of the eye, moderately curved below; 
elytra long and narrow, similar in form and venation to those of melschei- 
meri, but with nervures less distinct. 
General color of the female light yellow; eyes and tip of last segment 
purplish black; male slightly greenish-yellow; tergum and venter darker 
front with fuscous arc and in fall broods the vertex is marked with brown. 
Genitalia: Ultimate ventral segment of the female short, lateral angles 
slightly acute, central half of posterior margin narrowly produced; length 
of produced part equal to its width at apex; apex with three lobes indicated, 
produced part dark colored; male valve triangular, shorter than broad, 
