IOWA ACADEMY OF SCIENCES. 59 



Genitalia; female segment about half longer than the precedicg 

 one, the posterior margin with the median half slightly rouudingly 

 produced, whole segment very convex. Male plates scarcely as 

 long as the ultimate segment, equilaterally triangular, their apices 

 slightly divergently produced. Plates less than half the length of 

 the pygofers. 



Specimens are at hand from New Hampshire, Vermont, 

 New York, District of Columbia, Ohio, Iowa, Kansas, 

 Florida, Tennessee, Alabama, Mississippi, Mexico and the 

 West Indies. It occurs all over the eastern half of the 

 United States from Canada to Florida, west to Iowa and 

 Mississippi, and on into eastern Kansas and Nebraska; but 

 a careful search in the west ends of these states and in 

 Colorado has failed to find it. 



<^ Tettigonia geometrica Sign. Plate V, Fig. 2. 



^ Tetfigouia oeomehnca Sign. An Soc. Ent. Fr. . p. 12, PL 1, Fig. 12, 1854. 

 Tetfujonia yeo?netrica Bak. Psyche VIII, p. 285, 1898, 



Resembling^ hijida in form and color, but smaller and 



lacking the black lines on the elytra. Length, 4.5-5 mm.; 



width, scarcely 1 mm. 



\^ 



Vertex slightly shorter than in bifida, elytra narrower, vena- 

 tion similar, the fork of the outer branch of the first sector occur- 

 ring well behind the middle instead of at or before it, as in bifida, 

 and its branches somewhat more divergent. 



Color; vertex black, with the two light crescentiform bands as in 

 bifida, the anterior one narrower and almost broken on the frontal 

 sutures; the two spots at the apex larger, approximate. Face black, 

 the antenna^ and themargins of the led^e above light. Pronotum 

 and scutellum as in bifida Elytra bright green, the apical cells 

 smoky, margined in front by three pale spots, the outer one 

 the largest; the costal margin and usually the outer branch of 

 the first sector light yellow. Some Florida males are much dark- 

 ened up, but the )igh> spots on the wings remain or become enlarged. 



Genitalia; as iu bifida, but so much smaller that they are made 

 out with difticulty. 



Specimens are at hand from the District of Columbia, 

 Ohio, Kentucky, Florida, Arkansas and Mexico. Besides 

 these, it has been reported from Illinois, Alabama and 

 Louisiana. The Ohio River seems to be nearly its northern 

 limit, as ifc has only been taken in southern Ohio and 

 Illinois, and careful collecting in Iowa has not revealed it. 

 It doubtless occurs throughout all the Southern States from 



