150 
THIRTEENTH REPORT. 
2. Tettix ornatus (Harris). — Vertex about the width of oue eye; 
anterior margin obtuse; median carina projecting like a tiny tooth, ex- 
tending beyond the eye about two-thirds the length of the eye; median- 
carina only half the length of the vertex. Pronotum anteriorly trun 
cate or slightly convex; narrow at anterior carinae, between two and 
three times as wide at shoulders; median carina strongly compressed, 
nearly straight. Anterior lateral sinus (near base of second femur) 
deeyj, scarcely separated from posterior sinus by a very shallow median 
lobe. 
Measurements : — length of body, S mm. ; pronotum, 7 mm. ; hind fe- 
mora, 5 mm. 
Tettix ornatus is the most common of the Tettigidae, and shows great 
variation in markings. The pronotum is commonly either fuscous with 
velvety black spots, or gray with white spots and dark lines. 
3. Tettix acadicus (Scudder). — Vertex about twice the width of one 
eye; anterior margin truncate, extending only slightly beyond eyes; 
median carina projecting, indistinct posteriorly; profile of face showing 
indentation just below lower border of eyes. Pronotum truncate an- 
teriorly, acute posteriorly; shoulders three times the width of the space 
between the anterior carinae. Median carina of pronotum low, slightly 
arched, highest just in front of shoulders. Lateral lobe truncate posteri- 
orly, median lobe very small. 
Measurements: — length of body, 6.5 mm.; pronotum, 5.7 mm.; hind fe- 
mora, 4.5 mm. 
Genus Xomotettix Morse. 
This genus seems to be well represented at Douglas Lake; of Han- 
cock's eight species, four are found. Besides the characteristic given 
in the key, it differs from Tettix in having, commonly, a pair of rounded 
protuberances between the eyes and the median part of the pronotum. 
4. Xomotettix parvus Morse. — Vertex one and one-lialf times the 
width of an eye; anterior margin obtuse-angled (about 150°) ; extending 
in front of the eyes one-half the length of an eye; median carina on an- 
terior third of vertex, followed by a shallow groove, which widens pos- 
teriorly. Profile shows two indentations, a very shallow one above the 
ocellus, and a deeper and longer one half way from the vertex to the 
clypeus. Pronotum reaches to knees; anterior margin roundly obtuse, 
posterior margin acuminate; anterior carinae start at about the middle 
of the eye and somewhat approach each other; shoulders widen posteri- 
orly. Median carina slightly arched before shoulders. Posterior lateral 
sinus deep, acute angled; anterior sinus shallow. 
Color: — vertex, dark fuscous punctuate and bordered with yellow. 
Eyes black streaked with chestnut. Pronotum and legs tawny marked 
with black ; finely punctate. 
Measurements: — length of body, 6.5 mm. ;. pronotum, 6.75 mm.; hind 
femora, 5 mm. 
5. Xomotettix compressus Morse. — Body slender, compressed. Ver- 
tex twice the width of an eye. flaring toward front; anterior margin ob- 
tuse angled (about 120°) ; vertex twice as long as wide; median carina 
two-thirds its length. Profile shows sharp and deep indentation above 
ocellus, making the vertex appear, from the side, very acute. Pronotum 
