HANCOCK 8 1 



short-wing form and orjiatus interbreed as shown in experi- 

 ments of the author. It is more common than ornatus in 

 certain localities in Illinois and Wisconsin, where the numerical 

 relation between the two forms reaches about fifteen to one. 



Distribution, same as preceding, existing together in the 

 same localities. Morse unites the two forms ornatus and 

 triangularis, giving the following measurements: 



Total length, ^, 8.3-12.5 mm.; pronot., 7.5-10.8 mm.; 

 pronot., passing post, fem., 0-3.4 mm.; wings rel. to pro- 

 not., — .5- -|- I mm.; total length, 5, g-13.5 mm. ; pronot., 8-12 

 mm.; pronot., rel. to post, fem., 0-3.5 nim-; wings rel. to 

 pronot., — .5- +1.5 mm. 



The author collected a number of Tettix ornatus, form triangularis, at Kenilworth, 111. 

 They were very common on the cement sidewalks bordering a tield near the lake shore (L. 

 Michigan). This locality was visited several times during the summer, but now nearly all 

 the specimens are mature, and only rarely an nnuiature siiecimen is observed. It will be 

 observed that Tettix tnangnlaris lives in helds which are sandy but covered lightly by 

 vegetable mold, while Tettix gibbosus (the short-wing form being the commonest) lives in 

 boggy woods much more secluded than triangularis. — September q, 1S9Q. 



Tettix ornatus triangiiiaris, Morse. Psyche, vii, 107 (1^94); Blatch., Can. Ent., iii, 64 

 (1S98). 



Tettix triangularis, Sc\xAA..^ost. Journ. Nat. Hist vii, 475 (1.S62) ; Smith, Proc. Portl. 

 Soc. Nat. Hist., I., 151 I186S); Walk., Cal. Derm. Salt. Brit. Mus., V., 814 (1S71); Smith, 

 Kept. Conn. Bd. Agric, 1872, 3S3 (1872); Thum., Kept. U. S. Geol, Surv. Terr., 18^ (1873); 

 Scudd., Hitchc, Kept. Geol. N. H., I., 370 (1S74); Vxo\'. Nat. Can., viii, 137 (1876); Brun., 

 Can. Ent., ix. 145 (1877); Lintn.. Kept., In.s. N. Y., ii, 197 (1885): Caulf., Can. Ent. xviii, 212 

 (18S6); Bol., Ann. Soc. Ent. Belg., xxxi, 265 (1887); Caulf., Kept. Ent. Soc. Ont., .wiii, 71 

 (1888); Fern., Ann. Rep. Mass. Agric. Coll., XXV., 130-131 (1888); Smith, Cat. Ins. N. J.. 

 415 (1S90); Mowns., Proc. Ent. Soc. Wash., ii, 44 (1891); McNeill, Psyche, vi, 77 (1891) ; Dav., 

 Proc. Nat. Sc. Assn., Staten IsK, Feb. 14 (:8qi): Brun., Publ. Nebr. Acad. Sc, iii, 28 (1893); 

 Morse, Psyche, vii, 54 (1S94); Bent., Bull. Amer. Mus. Nat. Hist., vi, 310 (1894): Brun., Ann. 

 Kept. Nebr. Bd. Agric, 1896, 13S (1897): Lugg., Orth. Minn., 109 (1898); Smith, Ins.N. J., 

 159 (1900); Scudd., Inde.x N. .\m. Orth., 320-321-322 (19011. 



TETTIX HANCtJCKI, MORSE. 



Plate IV., Fig. 4, and appendages. 

 Plate XL, Figs. 5-53. 



Bod}' rather robust, granulate-rugose. Vertex viewed from 

 above about twice the width of one of the eyes, distinctly 

 advanced beyond their anterior margin; the front margin of 

 vertex scarcely obtuse, angulate, or convex; lateral margins 

 sinuate, on either side of median carina shallowly longitudi- 

 nally fossulate, deeper between the middle of the eyes; median 

 carina of vertex strongly distinct anteriorly, projecting as a 



