IOWA ACADEMY OF SCIENCES. 
49 
Homalodisca insolita Walk. Plate II, Fig. 3. 
Preconia iimoWa, Walk, Homop, Supp., p. 227, 1858. 
Pher a insolita, Fowl. Bio. Homop. II. , p. 222, pi. xiv, fig. 2, 1899. 
Resembling triquetra, but smaller and with a smaller head. 
Dxrk testaceous, with the anterior half of pronotum and vertex 
irrorate with yellow. Male sometimes almost black. Length, 10.5 
mm.; width, 2.25 mm. 
Vertex, no longer than the pronotum, very flat, but little 
inclined, margins acute, nearly right angled before. Front, con- 
vex, disc flat above. Face, as seen from side, much deeper than in 
, triquetra , the outline sinuate. Elytra, rather broad, coriaceous; 
venation, regular, not prominent, the claval veins united for a short 
distance, the cross-nervure at about the middle of the first sector. 
Color: dark reddish brown; a slightly olive tinge in the female. 
Vertex and anterior half of pronotum irrorate with pale yellow, 
sometimes a light median line in the furrow. Male very much 
darker, almost piceus on pronotum and elytra. Front and below, 
orange yellow; an ivory band arises on either side the apex of the 
vertex, below which it is indistinct, running back below the eyes, 
widening on the thorax and narrowing again on the margin of 
the abdomen. This stripe is narrowly margined with black, above 
and below, on the thorax. Fore tibiae, dark fuscous. 
Genitalia: Female segment twice longer than penultimate, the 
posterior margin triangularly emarginate. The emargination 
rounds off into a narrow median slit, which extends two-thirds of 
the distance to the base. Male plates about as long as the ultimate 
segments, equilaterally triangular, rather stout. 
Specimens are at hand from Texas and Arizona, and it 
is reported from several points in Mexico in the Biologia. 
The evenly coriaceous elytra readily separates this from 
either of the other species. Neither Walker nor Fowler 
describe the genitalia, which is quite distinct, but there 
seems little doubt but that this is the form Walker 
described. 
GENUS TETTIGONIA GEOFF. 
Head, bluntly conical, but slightly sloping, eyes rarely promi- 
nent; ledges over antennal sockets, as seen from above, fused with 
the vertex margin at apex, not prominent. Front, convex, but not 
gibbous; vertex convex, confused with the rounding front. Pro- 
notum, rather long, broadest at the lateral angles, the lateral and 
humeral margins nearly equal in length; posterior margin straight 
or roundingly emarginate. Elytra, covering the abdominal tergum; 
venation, simple non-reticulate, often obscured by the color mark- 
ings. Anterior tibise simple. 
This genus is world-wide in distribution, and contains a 
very large number of species of many different forms. Our 
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