100 HEMIPTERA-HOMOPTERA. 
angled before the base; scutellum convex, tricarinate; tegmina broadest behind the shoulders, with 
strong granulose veins, the transverse claval vein reaching the posterior vein just at the middle, the radial 
vein forked before the interior ulnar vein; wings with two transverse veins; posterior tibia with two 
strong spines, one before and one behind the middle, and a smaller one just before the knees. 
1. Pachyntheisa concinna, sp.n. (Tab. XI. figg. 3, 3 a-c, 3.) 
Fronte, vertice, pronoto et scutello plus minusve nigro-piceis, ad partem interdum dilutioribus; scutello sub- 
tilissime sculpturato, haud nitido ; tegminibus nigro-piceis, vittis tribus albidis subpellucidis variantibus, 
media interrupta, venis granulationibus nigris instructis ; abdomine piceo; pedibus testaceis, plus minusve 
piceis. 
Mas segmento ultimo ventrali ad medium producto, stylis longis, divergentibus, deinde approximatis, et iterum 
divergentibus, apicibus latis securiformibus, pilosis. 
Femina segmento ultimo ventrali ad medium truncato, ovipositore prelongo, fortiter curvato. 
Front parts dark, or more or less testaceous; scutellum very finely sculptured, dull; tegmina dark, with three 
somewhat varying whitish semitransparent bands, the central one interrupted in the middle of each tegmen, 
and the hinder one interrupted at the suture, the apex internally pellucid; wings milky; legs testaceous 
or more or less pitchy. 
Male with the last ventral segment of the abdomen with a process in the middle; styles very long, divergent, 
and enclosing a circular space, then approximate, and then again diverging, with pilose securiform tips. 
Female with the last ventral segment truncate in the centre, and with the ovipositor very long and curved ; 
waxy secretion strongly developed. 
Long. cum tegm. 5 millim.; lat. ad hum. 24-3 millim. 
Hab. Mexico, Chilpancingo and Xucumanatlan in Guerrero (H. H. Smith). 
2. Pachyntheisa excelsior, sp.n. (Tab. XI. figg. 4, 4a.) 
Preecedenti valde affinis, sed vertice ante oculos paullo producto, pronoti basi magis emarginat&; scutello 
longiori, deplanato, carinis magis distinctis ; colore antice dilutiori ; tegminibus subpellucidis fusco-notatis, 
granulationibus venarum perdistinctis ; pedibus piceo-testaceis. 
Very like the preceding, but with the vertex slightly produced before the eyes and subrectangular, the base of 
the pronotum more strongly and angularly emarginate ; scutellum longer in proportion and flatter, and 
with more distinct keels; colour of the front parts lighter; tegmina transparent, with the granulations 
very strongly marked, but with no distinct banding, only traces of fuscous fascie and dark markings on 
the margins and at the sides; legs obscure testaceous, the femora more or less pitchy. 
Long. cum tegm. 5 millim.; lat. ad hum. 23-3 millim. ( 9.) 
Hab. Mexico, Omilteme in Guerrero 8000 feet (H. H. Smith). 
One specimen. I was at first inclined to consider this insect as a variety of the 
preceding, but, apart from its coloration, it presents distinct differences in the structure 
of the vertex and, to a lesser extent, in that of the scutellum. 
MICRIXIA, gen. nov. 
Vertice brevi, angusto, ante oculos vix producto, oculis magnis infra distincte emarginatis ; fronte antice 
sensim angustataé, carina media nulla, lateribus distincte marginatis; clypeo ad medium et latera 
carinato; rostro longo; frontali carind nulla; pronoto distincte medio-carinato ; scutello pronoto fere 
duplo longiori, carinis tribus conspicuis; tegminibus pellucidis, ante medium latissimis, membrana 
costes permagna, venis radialibus et duabus ulnaribus fere equidistanter furcatis ; vena transversa clavi 
breviter bifurcata; tibiis posticis haud spinosis. 
Vertex small, short, and narrow, scarcely produced before the eyes, which are large and plainly emarginate 
