IOWA ACADEMY OF SCIENCES. 49 



^HoMALODiscA iNSOLiTA Walk. Plate II, Fig. 3. 



^Prfconia inioWa, Walk, HomoiJ, Supii.. p. 227. lS^S. 

 J'herainsolita, Fowl. Bio. lloinoi). II., p. 222, pi. xiv, tig. 2, 1S99. 



Resemblin^/'r/V«^/r«, but smaller and with a smaller head. 

 Dirk 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 Hat, 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 tibire, 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 tibia; 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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