_Female._ Ferruginous. Head testaceous, whitish behind; vertex luteous, blackish in front and behind; fore part with four blackish stripes; antennae blackish; thorax with seven whitish stripes, the middle one broad, the inner pair very slender, the second pair broad, the third pair lateral; abdomen bluish green, slightly varied with purple, base and fore part of the disk tawny; legs blackish; femora testaceous, with black tips; wings nearly limpid, with a slight lurid tinge in the discal areolet, blackish along the costa, and with a blackish oblique streak which extends from the costa along the praebrachial transverse vein; a blackish dot on the hind end of the discal transverse vein; veins black, discal transverse vein parted by about one-fourth of its length from the border, and by a little more than its length from the praebrachial transverse which is very oblique; alulae white; halteres testaceous, with black knobs. Length of the body 5 lines; of the wings 9 lines. 124. LAMPROGASTER SCUTELLARIS, n. s. _Mas._ Subcinereo-nigra; oculis albido submarginatis; thorace vittis tribus cinereis, vittis duabus lateralibus, scutelli subquadrati margine, tibiis intermediis tarsisque albidis; alis nigricantibus, fasciis duabus integris duabusque macularibus incompletis albidis. _Male._ Black, with a slight cinereous tinge; eyes partly bordered with whitish; third joint of the antennae elongate-conical; arista plumose, the bristles few; thorax with three indistinct cinereous stripes, and with two whitish lateral stripes; scutellum nearly quadrate, with a whitish border; middle tibiae, knees and tarsi whitish, the latter with black tips; wings blackish, whitish at the base, and with four whitish bands, first and third bands entire, second and fourth macular, very irregular and incomplete; veins black; discal transverse vein straight, parted by about one-fourth of its length from the border, and by hardly more than its length from the praebrachial transverse. Length of the body 2 lines; of the wings 4 lines. This species has some resemblance to the genus _Platystoma_, and differs rather from the characters of _Lamprogaster_; it and the two following species, which are still more aberrant, will probably be considered as three new genera. 125. LAMPROGASTER CELYPHOIDES, n. s. _Mas et Foem._ Atra, nitens, brevis, lata; capite, antennis pedibusque testaceis; abdomine nigro-cyaneo; alis limpidis, strigis transversis subcostalibus fuscescentibus.