MICROPEZA. 369 
1. Micropeza occipitalis, sp. n.,¢. 
Black ; antenne, pleurs, and legs yellowish-rufous ; occiput black in the middle and yellow at the sides. 
Length 6 millim.* 
Front a little narrower than the eyes, shining black; before the antennz are two large yellow spots, which 
are separated by a black line; occiput largely developed, somewhat quadrangular, shining black, laterally 
with a broad yellow border; face and cheeks narrow, yellowish-rufous, with white reflections. Antenne 
rufous; third joint rounded; arista pale. Thorax blackish-brown; prothorax shining black ; pleurve 
yellowish-rufous, with a triangular brownish band behind the fore coxie; scutellum testaceous. Abdomen 
black, with yellow incisions ; ovipositor shining black, rufous beneath. Legs yellowish-rufous; tips of 
the femora slightly infuscated ; front tibise (except the base), tips of the middle and hind tibiae, and all 
the tarsi, black. Halteres yellow, the knob brownish. Wings hyaline; first posterior cell closed and 
shortly petiolated. 
Hab. Mexico, Sierra de las Aguas Escondidas in Guerrero 7000 feet (Hl. H. Smith). 
A single female specimen. This insect may prove to be identical with Calobata 
pectoralis, Wiedem. (Aussereur. zweifl. Ins. 1. p. 540), which is also from Mexico, 
and, according to Loew, belongs to the genus Micropeza. 
2. Micropeza ruficeps, sp. n.,?. 
Head, antenne, thorax, and legs rufous; abdomen black, with the incisions and underside yellow. 
Length 7 millim. 
Face yellowish-rufous, its lateral borders with silvery-white reflections; front and occiput chestnut-brown, 
the front narrower than the eyes, black before the root of the antennw; on each side of the occiput, 
beneath the eyes, is a horizontal yellow band. Antenne rufous; third joint rounded; the hair-like 
arista pale. Thoracic dorsum brownish-testaceous, auteriorly more rufous, with two indistinct stripes ; 
pleure grey; scutellum brown. Abdomen brownish-black ; hind margins of the segments and the whole 
underside pale yellow ; ovipositor long, the proximal half rufous, towards the tip attenuated and shining 
black. Legs rufous; front coxve whitish-yellow ; tibiee blackish towards the tip; tarsi black. Halteres 
yellow, the knob black at the tip. Wings hyaline, with a slight yellow tinge; first posterior cell closed 
at the border of the wing. 
Hab. Mexico, Northern Sonora (Worrison). 
A single female specimen. 
3. Micropeza obscura. 
Micropeza obscura, Bigot, Ann. Soc. Ent. Fr. 1886, p. 387 !. 
This species is recognizable by its uniform black colour, with some greyish reflections ; in the pleura the grey 
colour predominates ; the lateral borders of the narrow face are silvery-white; the head is shorter than 
in most of the other species of the genus, the occiput being less prominent than usual behind the eyes ; 
in the males the head has on the underside a fringe of black hairs, which is absent in the females. The 
thoracic dorsum shows no stripes; the abdominal segments have narrow grey hind-borders ;_ the 
hypopygium of the male and the ovipositor of the female are shining biack; in one or two of the male 
specimens some yellow projections are visible. The antenne and legs are rufous; the third antennal 
joint is rounded ; the femora have two blackish rings—one beyond the middle and the other near the 
* The measurements given are exclusive of the genitalia, which are often prolonged and always turned 
downwards. 
