Stratiomyidae — JAMES 
185 
posterior half of the wing; in aurifer, the apex 
is distinctly darker and this area is sharply 
defined from both the anterior yellow and 
the posterior gray areas. In size, aurifer is 
normally larger (17 to 22 mm. in length), 
the upper parts lack the bluish reflections, 
and the fifth abdominal segment, though va- 
riable, is marked with black. I can find no 
structural differences; the genitalia seem to 
be identical. 
Ptecticus australis Schiner 
Ptecticus australis Schiner, 1868, Novara 
Reise, Diptera, p. 65. 
Originally described from the Nicobar Is- 
lands, this species has been recorded from 
Ceylon, Siam, Malaya, and various Indian lo- 
calities by Brunetti, and I have seen it from 
Palowan, Philippine Islands. One female and 
five males from Chizuka, Okinawa, July to 
September, 1945 (G. E. Bohart, C. L. Har- 
nage), represent a form with the hind legs 
somewhat paler than in the typical form; 
the tibia and base of the basitarsus are brown 
rather than black, though these areas dis- 
tinctly contrast with the yellow of the hind 
femur and the white of the remainder of 
the hind tarsus. Otherwise, I note no signif- 
icant difference from Indian and Philippine 
specimens. 
Ptecticus tenebrifer (Walker) 
Sargus tenebrifer (Walker), 1849, List of 
the specimens of Dipterous insects in the 
collection of the British Museum, pt. 3, 
p. 517. 
This common Oriental and southeastern 
Palaearctic species is represented by a long 
series of males and females from Chizuka, 
Okinawa. 
SPECIES FROM GUAM AND ROTA 
Paracechorismenus guamae new species 
Female: Head shining black. Vertex two- 
fifths head width, narrowing to the nearly 
parallel-sided front; front at narrowest equal 
to distance from anterior ocellus to the an- 
tennal insertion. Face with a few whitish 
hairs and with conspicuous whitish-tomentose 
orbits. Head profile essentially as in inter- 
medius Kertesz, except that the ocellar tri- 
angle is not quite so prominent. Antennae 
yellow, the flagellum above and the arista 
brownish-black; arista 1.65 length of rest of 
antenna. Proboscis yellow. Measurements of 
holotype in micrometer units (85 = 1 mm.): 
Width of head, 50; of vertex, 20; of front 
at narrowest part, 13; front, anterior ocellus 
to antennal insertion, 13; length of antenna 
excluding arista, 12; of arista, 20. 
Thorax black, subshining; mesonotum and 
scutellum with conspicuous, rather dense, 
golden tomentum; posterior area of meso- 
pleuron with similar yellow tomentum. Legs 
uniformly yellow, at most slightly darkened 
toward apices of tarsi. Halteres yellow. Wing 
venation typical; wings slightly clouded; 
heavy veins brown; veins inclosing discal 
cell, except at base, and those radiating from 
it, weak and unpigmented. 
Abdomen black; pile mostly black, incon- 
spicuous, that on fifth tergum and laterally 
on third and fourth terga somewhat longer 
and yellowish. Ovipositor yellow. 
Length, 1.75 to 2.5 mm., mostly about 
2 mm. 
Male: Front narrower than in the female, 
at narrowest 0.18 to 0.20 head width and 
0.65 to 0.70 distance from anterior ocellus 
to antennal insertion. Tomentum of meso- 
notum and scutellum longer but more scat- 
tered than in the female, tending more to 
whitish but with golden tomentum definitely 
intermixed and usually predominating. Gen- 
italia yellow. Otherwise, as described for the 
female. 
Holotype: Female, Guam, January 12, 
1938 (R. G. Oakley); resting on Ochrosia 
fruits; Guam no. 1206; Lot no. 38-14973; 
U. S. National Museum type no. 59339. 
Allotype: Male, Point Oca, Guam, May, 
