156 
THIRTEENTH REPORT. 
slightly from the base to the middle, then widen slightly; truncate at 
the end. 
Color: — There are i'^'o groups of M. Mvitattus , those whose light parts 
are of a bluish cast and those of an olive or yellow cast. Occiput fus- 
cous. becoming lighter on the vertex and still lighter on the lower part 
of Ihe face. P’sk of pronotum fuscous, black line from eye along lateral 
lobe of prozona, the rest of the lateral lobe like the face. Light bluish 
or greenish yellow stripe from the upper angle of the eye, backwards, 
across the head, along the lateral carina of the pronotum, and humeral 
angle of the tegmina. General color of the tegmina oliveo or reddish- 
fuscous. Inner surface of hind femora yellow, four black bars near 
upper carina; outer surface fuscous above, light yellow below. Tibiae 
red. 
Measurements: — Length of body, male, 26 mm., female, 39 mm.; an- 
tennae, male, 15 mm., female, 12 mm.; pronotum, male, 6 mm., female, 
7.5 mm. ; tegmina, male and female, 23 mm.; hind femora, male, 14 
mm., female, 17 mm. 
SUB-FAMILY TRYXA LINAE. 
The members of this group are characterized by a straight, horizontal 
or ascending vertex, a face which is very oblique, and often meets the 
vertex at an acute angle; the antennae are very variable, sometimes 
conical; the length of the tegmina often varies within the species. The 
disk of the pronotum is Hat, with a low median carina, cut by but one 
sulcus. The wings and tegmina are transparent or dull colored. 
But one genus and one species was found at Douglas Lake. 
Genus Sienobothrus Fischer. 
“Vertex triangular, obtuse in female, acute in male; the foveolae visi- 
ble from above as narrow, oblong, or linear impressions; the median 
carina absent, or at most a colored line. Antennae filiform; much 
longer than head and pronotum in male. Pronotum with the median 
carina distinct, cut a little behind the middle by the principal sulcus; 
the lateral carinae sinuate or curved, so that the middle of disk is nar- 
nower than the fore and hind margins. Lateral lobes of pronotum about 
as long as deep, the front margin straight, the hind and lower margins 
sinuate. * * * Hind femora rather slender; not transversely barred. 
Valves of ovipositor short, but plainly exserted.” — Blatchlev. 
15. Stenolotlirus curtipennis (Harris). — Vertex narrow, rounded 
where it meets the face. Frontal costa narrow, oblique, sulcate at and 
below the ocellus. Antennae flattened throughout. Pronotum truncate 
or subtruncate both anteriorly and posteriorly. Median carina low but 
distinct, not crested, cut by the principal sulcus, which also cuts the 
lateral carinae. Length of tegmina varies from two-thirds to five fourths 
the length of the abdomen. Body slender. Male cerci straight, slender 
processes. 
Color: — Face light brown, sometimes with the frontal costa dark. 
There is a light brown stripe along the median line of the vertex and 
pronotum, sometimes extending along the dorsal region of the tegmina. 
On t lie head and pronotum this stripe is bordered by a fuscous line, be- 
low which is another light, then another dark band. Tegmina light 
