26 
that the insect can the more readily be determined by those who care 
to do so for themselves : 
A rather large but slender species. About the size of M. spretus, but with much 
narrower wings and tegmina. Usually of a light transparent grass-green color, but 
changing to a dull olive brown in some specimens during late fall. Related to M. 
Jiavidus, M. cinerens, and M. bowditchi, from which species it differs in its smaller head 
and more oblique face. 
Vertex between the eyes quite narrow, somewhat prominent, the foveola elongate 
spatulate, rather deep in the male, less so in the female, the lateral walls strong, 
rounded; frontal costa very broad and prominent above, less prominent below, where 
its sides converge very perceptibly in the female, parallel in the male, deeply aud 
roundly sulcate from just above the ocellus ( 9 ) or throughout ( $ ). Antenna 1 , very 
long in both sexes, longest in the male. Eyes large and prominent, those of the 
male subelliptical, of the female with the anterior edges nearly straight. Pronotum 
rather slender, rounded above and with the sides nearly parallel or gradually 
widening posteriorly; anterior lobes plain, posterior lobe minutely and closely 
punctate; anterior edge nearly straight, posterior edge roundly angulate; median 
carina present only on the posterior lobe, lateral carinas obsolete; transverse im- 
pressed lines plain, continuous, the last a trifle back of the middle. Tegmina and 
wings reaching beyond the tip of the abdomen in both sexes, the former rather nar- 
row, lanceolate. Terminal segments of the male abdomen but slightly enlarged, 
gently upturned ; the last ventral segment prow-shaped, the outer edge entire ; supra- 
anal plate subquadrate, the lateral edges raised and somewhat sinuous, the apex 
gently depressed and slightly produced ; in the middle there is a broad median carina 
terminating between two shorter ones near the apex; marginal apophyses of preced- 
ing segment very large, broad and fleshy, covering fully one-half of the underlying 
supra-anal plate, their inner edges touching for the first two-fifths of the distance 
from their bases and again at their apices, leaving a small, narrow, elliptical opening, 
their outer edges parallel, obliquely (locked at the apex. Anal cerci a little more 
than twice as long as the basal width, the apical half finger-like, plain, the apex 
rounded, directed backwards and slightly inwards. Prosternal spine conical, rather 
long and slender, the point directed gently forward. Posterior femora normal, not 
quite reaching ( 9 ), or slightly suppressing ( $ ) the tip of the abdomen; anterior 
and middle femora but very little enlarged in the male. 
General color varying with the season and in different individuals from lightgrass 
green to dull olive brown, varied beneath and along the sides of the face, pronotum 
and thorax with dull white, yellow, and brown. The usual piceous band, which in 
this species reaches to the last transverse incision, is more or less plainly visible 
along the sides of the pronotum in different individuals. The tegmina are either 
pale green, dull olive, or drab, without spots; the wings with the apical veins and 
nerves more or less infuscated. Posterior femora without indications of bands along 
their upper edges and outer faces, a rather wide whitish line along the lower edge 
of the outer face, and also a tinge of light orange yellow below and on the inner face; 
posterior tibia? deep sea-green, the spines with their extreme tips black. Antenna? 
reddish inclining to brown apically. 
Length of body — male, 22 mm , female, 28.5 mm ; of antenna? — male, 13 mm , female, 
ll mm ; of pronotum— male, 5 1Iun , female, 6.15 mm ; of tegmina— male, 20 mm , female, 24 mm ; 
of hind femora— male, 12.2 mm , female, 15 mm ; of hind tibia? — male, 10 mm , female, 
13 mm . 
The present species is confined to the river bottoms in the compara- 
tively arid regions of onr southwestern States, and also occurs across 
the line in Mexican territory for some distance. 
