DICHEOMOEPHA. 87 



of the * Biologia,' but it is known to occur along the eastern, or gulf, coast of Mexico. 

 D. viridis has been reported from nearly every locality between Carrizo Springs, Texas, 

 and the Canadian Territory to the north of the United States east of the Eocky 

 Mountains. 



2. Dichromorpha mexicana, sp. n. (Tab. I. figg. 18, 18 a, $ .) 



About the size of, and as robust as, D. viridis, but with fully developed tegmina and wings. 



Head as wide as the front edge of the pronotum, the occiput very gently ascending above the plane of the disc 

 of the latter, the lateral carina? of the vertex meeting at the fastigium in a right angle in both sexes, 

 deeply sulcate, and without trace of a median carina ; face gently ( $ ) or considerably ( <S ) retreating 

 below ; frontal costa only moderately prominent, in the $ rather wider and with the sides parallel from 

 near the top to a point a little below the ocellus, then gently diverging to the clypeus, in the S slightly 

 divergent throughout, shallowly sulcate in both sexes. Antennae about normal. Pronotum with lateral 

 carinae and sides nearly parallel, hardly perceptibly approaching in the middle ; lateral carinae cut in some 

 specimens at least by both the middle and last transverse sulci ; hind margin broadly angulate. Tegmina 

 and wings reaching ( $ ), or considerably surpassing ( <$ ), the tip of the abdomen. Hind femora normal, 

 the tibiae with ten spines in the outer row. 



General colour green, with the usual dark markings along the sides of the pronotum, pleura, and tegmina. 

 Knees in the c? dark, in the $ hardly at all infuscated ; tibiae and feet infuscated and with a dark 

 purplish tinge. A single $ is uniformly wood-brown, as often seen in this sex of D. viridis. 



Length of body, <$ 16, $ 26; of pronotum, <$ 4, $ 5-35; of tegmina, <J 13*5, $17; of hind femora, 

 J 10-5, $ 14 millim. 



Hah. Mexico, Sinaloa (Behrens, in coll. Scudder : 6 ), Tepic {coll. Calif. Acad. 

 Sci. : c? $ ). 



Nine specimens. 



3. Dichromorpha longipennis, sp. n. 



A much larger, slenderer and smoother-bodied, longer-winged insect than D. viridis, even than D. mexicana, to 

 which latter it is more nearly related. Superficially rather like an Oi-phulella, but the straight lateral 

 carinae and the position of the last transverse sulcus of the pronotum at once remove it from that genus. 



Head as wide as the front edge of the pronotum, very gently ascending above the plane of it ; vertex provided 

 with rather high lateral carinae, which meet at the fastigium in a little less than a right angle ( $ ), or 

 one that is decidedly acute ( <S ), and a moderately deep sulcus, the latter with a well-defined median 

 carina ; face somewhat oblique, the frontal costa moderately prominent above, evenly diverging below, 

 sulcate throughout; antennae with the joints plainly flattened, in the d 1 slightly longer than the head 

 and pronotum together, in the $ rather shorter. Pronotum with the lateral carinae gently con- 

 verging in front ; the last transverse sulcus very plain, cutting all three carinae ; hind margin broadly 

 angulate. Tegmina and wings complete, in the $ reaching to, or beyond, the tip of the abdomen, in the 

 £ to the tip of the hind femora; the former slender and with the apex evenly rounded. Hind femora 

 rather long and slender, in the $ reaching to, or a little beyond, and in the tf to nearly one-third their 

 length beyond, the apex of the abdomen. Hind tibiae with 11-13 spines in the outer row. 



General colour grass-green, with the feet, tibiae, and apex of hind femora more or less tinged with brownish- 

 purple. A narrow dark line extends along each side from behind the eyes, following just below the 

 lateral carina? of the pronotum to the tegmina, where it continues and covers the discal field to the apex. 

 In some specimens the entire tegmina, save their anterior or costal area, becomes thus darkened. 

 Frequently the colouring of the tegmina is of a purplish tinge. In the J , which is always somewhat 

 darker-coloured than the other sex, the dorsal field is green, as in both D. viridis and D. mexicana. 



Length of body, 6 16, $ 22-24; of antennae, S 7, $ 5-7; of pronotum, rf 3'65, $ 4-5-5; of tegmina, 

 ° 6 14, $ 15-19 ; of hind femora, <3 11, $ 12-14 millim. 



