IOWA ACADEMY OP SCIENCES. 
211 
DEL.TOCEPHALUS MINIMUS N. SP. 
(Plate xxiv, Fig. 4.) 
Form and color of debilis, but less than half the size; length 
of vertex more variable even than in that species; the smallest 
species in the genus; length, female, 2.75 to 3 mm.; male, 2.25 
to 2.50 mm. 
Vertex very variable in length, usually convexly and acutely pointed in 
the female, longer than the x^ronotum; roundingly rectangular in the male, 
about equaling the pronotum; front strong; similar to debihs, broader on the 
clypeus; clypeus broad, one-half longer than wide; lorse broad, nearly 
semi-circular; gense much narrower than the eyes, lateral margin short and 
straight. 
General color like that of debilis; vertex, margins of the pronotum and 
scutellum yellowish-green; disk of the pronotum and basal part of the ely- 
tra dark green; apical portion of the elytra lighter. Below, front fuscous 
with lighter arcs, rest of face greenish; tergum and venter greenish or 
fuscous, varying to black; legs usually distinctly black below. 
Genitalia: Ultimate ventral segment of female broad; posterior margin 
roundingly produced from the lateral angles, narrowly arcuated and notched 
medially, black tipped; py gofers nearly twice as long as width at base, 
equaling the black ovipositor; male valve large, triangular; plates broad, 
convexly pointed, three times the length of the valve, usually a dark spot 
beyond the middle of each. Described from numerous examples. 
Larvae: Small dark green forms with acutely pointed vertices and black 
faces and eyes; vertex convexly, acutely pointed; body long, tapering from 
eye back to tip of abdomen; hairs on abdomen distinct; green above, ver- 
tex lighter, ocelli black. Below, all dark fuscous to black in the later 
moults, especially noticeable on legs. 
This very small and distinct species occurred abundantly on 
a patch of raw prairie adjoining the Adropogon field, where the 
oculatus occurred so thickly, and was found at the same time 
and in the same stages as that species throughout the season, 
but did not occur on the isolated Andropogon. Sporobolus 
heterolepis and the Stipa were very plentiful, where they were 
most abundant, either one of which would harmonize well with 
its green color. 
DELTOCEPHALUS MELSCHEIMERI PITCH. 
(Plate xxiv, Fig. 1.) 
Amblycephalus melscheimeri Fitch. Homop. N. Y. State Cab., p, 61. 
Deltocephalus debilis Osborn. Bull, Iowa Exp. Sta. No. 13, p. 100; No. 20, p. 714. 
Deltocephalus afflnis Gillette and Baker. Hemiptera of Colorado, p. 84. 
Deltocephalus auratus Gillette and Baker. Hemiptera of Colorado, p. 85 (Female). 
This is a slightly smaller species than debilis and with more 
general fuscous markings. 
Vertex one-half longer on middle than at eye, width between eyes 
greater than length; obtusely, slightly roundingly angled. Front narrower 
