1936] 
N eotropical Stratiomyidae 
51 
punctured or rugulose dorsally; scutellum and spines yel- 
low. Abdomen yellow in ground color ; segments two to five 
inclusively with extensive blackish markings dorsally, which 
on segments two, four and five nearly cover the tergites, 
except for the lateral margins and a basal triangle on each 
side; the black on segment three similar, except that the 
apical two-fifths of the tergite is wholly yellow ; venter yel- 
low. In addition to these segments, four genital segments 
form a rather slender ovipositor which terminates in a pair 
of cerci that extend some distance beyond their segment. 
Legs yellow; the posterior femora narrowly darkened api- 
cally and basally; the hind tibiae darkened on their inner 
sides. Wings grayish brown, paler basad of the arculus and 
beyond vein R 4 ; also a median pale band running from the 
position of the stigma across the apices of the two basal 
cells and the base of the discal cell, and terminating in the 
wing margin in the fifth posterior cell ; the veins crossed by 
this band, including cross-vein r-m, white ; the veins other- 
wise brown. Pile of entire body very sparse, yellow. 
Length, 7 mm. 
Holotype: female, Hamburg Farm, Costa Rica, April 6 
(C. W. Dodge). 
Microchrysa abdominalis, new species 
Male. Head and thorax bright metallic green, with 
cupreous reflections in certain lights; antennae bright yel- 
low; the proboscis, humeri, wing-bases, and a region below 
and behind each wing base, including the pteropleura, meta- 
pleura, and metanotum, pale yellow, not metallic; a narrow 
pale yellow stripe connecting the humeri and the wing bases ; 
the extreme apex of the scutellum yellow ; postscutellum yel- 
low. Halteres yellow, the knobs whitish. Legs and abdo- 
men pale yellow, the latter with abundant, but short, 
appressed pile, which is black above, yellow below. Wings 
hyaline ; stigma and strong veins yellow. Length, 3 mm. 
Female. Front broader than face, metallic green. Abdo- 
men variable : typically, it seems to be yellow, with a strong 
metallic green reflection over the greatest part, though two 
specimens seem to be metallic green in ground color, with a 
variable amount of non-metallic yellow basally and laterally. 
Otherwise as in the male. 
