ART. 11, GENUS MESEMBRINELLA GIGLIO-TOS—ALDRICH. 3 
of distinct, jointed palpi; apical cell petiolate; color wholly pale tes- 
taceous; transverse facial impression yellow; 3 lines long. The 
genus was not recognized from 1830 to 1915, as far as I know; in 
the latter year Townsend? identified it from Tasmania, a species which 
he regarded as testacea having been described by Coquillett (1900, 
p. 390) as Myiophasia flava. The 2 males described by Coquillett are 
in the United States National Museum, and 11 additional specimens 
of the genus have been received from Dr. J. F. Illingworth, all col- 
lected or reared at Cairns, North Queeensland. The supposed labellar 
palpi are little soft posterior prolongations, which in drying assume 
various shapes, sometimes quite like palpi; they are not jomted, in 
spite of Robineau’s assertion. 
The generic characters are as follows: 
Front very narrow in the male, in the female of testacea also very 
narrow, of desvoidyi 0.27 the head width. When the front is narrow 
there are no developed verticals, nor orbitals, but the female of des- 
voidyi has the usual two pairs of each, the latter small; ocellars very 
small, directed forward; frontals small, beginning well before ocellar 
triangle and reaching only to lunula; front not prominent; antennae 
ordinary, third joint about 24 times the second and reaching nearly 
to the vibrissae, which are somewhat above the mouth and a little 
approximated; facial ridges low and bare, a few short stubby hairs 
about the vibrissae; transverse impression large, extending below the 
eye to form most of the bucca, which is from one-fourth to one-third 
the eye height in profile; parafrontal and parafacial narrow, with short 
but distinct hairs arranged somewhat in two or three rows, extending 
to the lower edge of the eye; back of head not bulging; proboscis 
small, palpi normal, labella as above noted. Thoracic chaetotaxy: 
acrostichal, anterior 1, posterior 1; dorsocentral, anterior 2-3, pos- 
terior 3; humeral 2; posthumeral 1; presutural 1; notopleural 2; supra- 
alar 1; intraalar 1 (far back); postalar 2; scutellar, 1 apical, 1 
lateral; prothoracic 1; mesopleural, 1 above, 1 anterior, 4 posterior; 
sternopleural, 1-2 anterior, 1 posterior; pteropleural, 1 small; hypo- 
pleural, row of 8 slender. All the specimens show a well-developed 
pair of prosternal bristles, a very unusual character. 
Abdomen with dorsum curved downward apically on account of 
the shortness of the sternites; female without any apical piercing 
structures, showing seven sternites all of nearly equal length except 
the second which is longer; male with small genitalia; no discal 
bristles on intermediate segments. 
Legs of ordinary structure, claws and pulvilli long in male, short 
in female; middle tibia with a small bristle on inner front side. 
2 Ins., Ins. Menst., vol. 3, 1915, p. 115 
