IOWA ACADEMY OF SCIENCES 
63 
Iowa, Colorado, Vancouvers Island, British Columbia and 
Mexico, and it has been reported from Nova Scotia and 
Hudson Bay, by Walker. It appears to range the conti- 
nent from Hudson Bay and British Columbia on the north 
to at least southern Mexico on the south. 
Genus Diedrocephala Spin. 
Head narrower than pronotum, eyes small, vertex flat or con- 
cave except on posterior margin, roundingly angulate, the apex 
obtusely rounding, the margins sharp, acute, or very slightly 
rounded and usually dark lined. Front broad, almost flat above, as 
seen from side evenly rounding, in the same curve with clypeus. 
Pronotum broadest across lateral angles, 'the side margins continu- 
ous with the curve of anterior margin, strongly curved in front, 
posterior margin broadly, slightly emarginate. Elytra rather long, 
coriaceous, obscuring the venation; venation of the same pattern as 
in Tettigonia , except that the apical cells are usually longer and 
narrower. Anterior tibiae round or prismatic. 
This genus was founded on a South American species 
( variegata ) in which the head is very similar to that of 
coccinea , but the apex of the elytra is slightly emarginate 
in the middle and the outer cells very weak and obscure; 
the venation, however, is essentially the same as in cocci- 
nea, and the notch in the elytra, while distinct in a few 
species, is variable or wanting in others from the same 
region and appears to be a specific rather than a generic 
character. 
KEY TO THE SPECIES. 
A. Vertex unmarked except for a black band on the anterior 
margin. Species robust 8 mm. or over coccinea Forst. 
AA. Vertex with black markings nearly parallel with the anterior 
margin which is usually black lined, often a pair of approxi- 
mate median lines on the disc. Smallei 6 mm, or under 
versuta Say. 
Diedrocephala coccinea Forst. Plate YI, Fig. 2. 
Cicada coccinea Forst. Nov. Spp. Ins., p. 96, 1781. 
Tettigonia quadrivittata Say. Jour. Acarl. Nat. Sc. Phila. VI, p, 312, 1831. 
Tettigonia pict a Walk. Homop. Ill, p. 758, 1851. 
Tettigonia teliformis Walk. Homop. Ill, p. 764, 1851. 
Diedrocephala coccinea Osb. & Ball. Iowa Acad. Sc. IV. p. 1 77 . 1807. 
Tettigonia quadrivittata Fowl. Bio. Homop. II, p. 276. PI. 18. Fig. 20,1900. • 
Tettigonia idonea Fowl. Bio. Homop. II, p. 276, PI. 18, Fig. 22,1900. 
Reddish with green stripes on pronotum and elytra. 
Vertex orange, black margined. Length, 8-9 mm.; width, 
1.75 mm. 
