280 SUPPLEMENT. 
Two examples; both these have the apical ventral segments simply concave near the 
apex, without trace of raised margins. The Guatemala specimen has, however, the more 
slender form of the male sex; and, if it be really a male, the species must be specifically 
distinct from 0. rufiventris, in which the same segment has a long triangular excavation 
with raised margins. So abrupt a structural modification would be very remarkable, 
the excavated last ventral segment with raised margins having been considered a generic 
character; such abrupt changes are common in the Longicornia, and the closely allied 
O. rubricollis from the Amazons has the segment entire. 
10. Ophistomis lachrymans, (Tab. XX. fig. 4.) 
Niger, nitidus; elytris basi latis ab ‘ante medium valde angustatis, linea (medio interrupta) utrinque versus. 
basin fulvo-testacea ; capite ante oculos minus elongato, lato ; thorace confertim subrugulose punctulato, 
linea dorsali levi; elytris undique discrete punctulatis apice obliquissime truncatis; pectore utrinque: 
segmentis 1°-4™ basi minutissime punctulatis fulvo-pubescentibus. 
¢. Segmento ventrali terminali elongato, marginibus maxime elevato-laminatis, lobiformibus. 
Long. 10 lin. ¢. 
Hab. Guatemaa, Purula (Champion). 
The elytra are very broad at the base, broader relatively than in any other known 
species; the narrowing thence to the middle is consequently more rapid than in the 
allied forms. 
Found on the wing in the virgin forest at an elevation of about 5000 feet. 
11. Ophistomis melampus. 
Gracilior, niger, nitidus; antennarum articulis apicalibus fulvis; capite ante oculos valde elongato et angusto 
sparsim punctato, vertice confertissime punctulato; thorace ante medium paullo dilatato, dorso confertim. 
ruguloso-punctulato ; elytris basi latis et ante medium valde angustatis, apice oblique truncatis, medio- 
basi utrinque et juxta suturam depressis, discrete punctulatis ; pectore ventrisque segmentis basi subtiliter 
dense punctulatis et griseo-pubescentibus. 
3. Segmento ultimo ventrali elongato, marginibus maxime elevato-laminatis, lobiformibus. 
Long. 8lin. CO. 
Hab. Guatemata, San Gerénimo (Champion). 
12. Ophistomis brachialis. 
O. melampo similis et affinis, differt femoribus anticis fulvis antennisque toto nigris. Gracilis, niger subnitidus,. 
femoribus anticis fulvis ; capite ante oculos valde elongato et angusto; thorace medio paullulum dilatato, 
dorso sparsim subtiliter punctulato nitido; elytris basi minus dilatatis, postice valde angustatis, apice- 
sinuato-truncatis, angulo exteriori longe producto, grosse et sparsius punctulatis ; metasterno ventrisque. 
segmentis basi subtiliter punctulatis et argenteo-pubescentibus. 
do. Segment ultimo ventrali medio longitudinaliter concavo marginibus minus alte elevatis. 
Long. 7 lin. o. 
Hab. Mexico, Oaxaca (Sallé). 
13, Ophistomis sallei. 
Aurantiaco-fulvus, supra brevissime et densissime pilosus ; occipite, thoracis vittis duabus, scutello, maculis. 
utrinque duabus ante medium elytrorum suturaque, fusco-nigris ; antennis nigris, articulis 8°-10™ flavo-- 
