ART. 11. GENUS MESEMBRINELLA GIGLIO-TOS—ALDRICH. 19 
inal bristles except a weak row on the tip of the fourth segment, 
while aeneiventris has marginals of larger size on both the third and 
fourth segments and discals on the fourth. Surcouf had only a 
single female from Brazil. 
Length, 12 mm.; above the average size. 
The type was from Brazil. 
MESEMBRINELLA QUADRILINEATA Fabricius. 
Musca quadrilineata Fasricius, Systema Antl., 1805, p. 286. 
Mesembrina quadrilineata W1EDEMANN, Auss. Zweifl., vol. 2, 1830, p. 347. 
Ochromyia flavipennis Macquart, Dipt. Exot., vol. 2, pt. 3, 1843, p. 291, pl. 17, 
fig. 3.—Surcour, Revis. Musc. Test., 1919, p. 65, pl. 3, fig. 4. -VILLENEUVE, 
Bull. Soc. Ent. France, 1920, p. 224. 
I have seen no material identified by Doctor Surcouf as flavipen- 
nis, but specimens agreeing well with his description have been 
received. I follow suggestions received from Maj. E. E. Austen, of 
the British Museum, in selecting this as the true quadrilineata, in 
spite of the supposed type examined by Surcouf. It is apparent 
from the original description and that of Wiedemann that the type 
of quadrilineata had a dark subcostal stripe, while the specimen 
received by Surcouf had no such mark. This would seem to oblige 
us to choose for the true guadrilineata between randa and flavipennis; 
the additional character mentioned by Fabricius, ‘‘ Abdomen viola- 
ceum, nitidum’”’ applies much better to the latter than the former. 
Doctor Villeneuve states that the type of flavipennis has no calcar 
on the hind tibia, but if I interpret this correctly the bristle is 
merely smaller and higher up than usual, at or above the middle. 
Male.—-Front fully twice as wide as the ocellar triangle, the median 
stripe very narrow above, the parafrontals light golden yellow, 
nearly as wide as the parafacials. Chaetotaxy: humeral 2; post- 
humeral 1 (anterior); acrostichal 0, 1; dorsocentral 2, 3; presu- 
tural 1; notopleural 2; supraalar 3; intraalar 2; postalar 2; sterno- 
pleural 2; scutellar 1 lateral, 1 apical, and a small discal; first 
abdominal segment with several at the side; second with only one; 
third with a widely spaced row of stout marginals; fourth with small 
marginals. General color yellow, the mesonotum behind and the 
scutellum nearly black; abdomen with about the apical third bluish 
violet; mesonotum with four distinct pollinose stripes, reaching the 
scutellum. Legs yellow, the middle and hind tibiae brown, slightly 
flattened, with only small bristles; these and their femora elongated, 
the latter slender. Wings longer and narrower than usual, yellowish 
brown in color, with heavy black subcostal stripe beginning beyond 
the auxiliary. 
Female.—¥ront two thirds as wide as one eye, blackish above; 
most of the abdomen bright purple, highly polished; femora less 
elongated, the middle ones stouter. 
