8 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62. 
color of the thorax mentioned so prominently by Van der Wulp; the 
base of the abdomen is yellow, however, and there are indications of 
red in the pleurae in all the specimens, the mesonotum nevertheless 
would have to be called blue green. Legs brownish red. Wings 
wholly infuscated, but darker apically near the costa. 
MESEMBRINELLA Giglio-Tos. 
Mesembrinella Gieu10-Tos, Boll. Mus. Zool. ed. Anat. Comp. R. Univ., Torino, 
vol. 7, No. 132, p. 4 (Oct. 1892); Mem. R. Acad. Sci., Torino, ser. 2, vol. 45, 
1895 (Ditt. del Mess., pt. 4), p. 11. Type, Musca quadrilineata Fabricius, by 
designation, 1892. 
Mesembrinella Brauer, Sitzber. Kais. Akad. Wiss., vol. 104, 1895, p. 594. 
Huascaromusca TOWNSEND, Insecutor Ins. Menst., vol. 6, 1918, p. 155 (type 
cruciata, new, from Peru). 
Ochromyia and Mesembrinella Surcour, Revis. Musc. Testaceae, 1919, p. 63. 
We still have to consider as American representatives of Surcouf’s 
group his Ochromyia and Mesembrinella. His use of both names is 
open to question. The type of Ochromyia was distinctly designated 
at its first publication as Musca jejuna Fabricius. This species from 
Surcouf’s examination of the type is a Bengalia, and in fact the only 
species known of this genus, of which all Desvoidy’s names are prob- 
ably synonymous (although Surcouf mentions only éestacea, desig- 
nating it as type of Bengalia,> omitting the others from considera- 
tion). Obviously Ochromyia, 1835, is a synonym of Bengalia, 1830, 
having the same genotype. Now Mesembrinella also has a genotype, 
designated when it was first published, which is Musca quadrilineata 
Fabricius. This species from the type Surcouf places in Ochromyia. 
This situation would seem to require the transfer of the name Mesem- 
brinella from Surcouf’s group of that name to his Ochromyias, left 
without a name by making Ochromyia a synonym of Bengalia. There 
is, however, an alternative which largely does away with the confu- 
sion which a transfer would entail, namely, the union of both genera 
as taken by Surcouf under the name Mesembrinella. A consideration 
of the generic characters used by Surcouf shows that this is not only 
practicable but unavoidable. He separated the genera on the pres- 
ence of one anterior sternopleural in Ochromyia and two in JMesem- 
brinella, both groups having also one posterior. ‘The commonest 
Central American species varies frequently between one and two 
anterior sternopleurals, the lower when present sometimes very small, 
hardly more than a hair. Other characters seem to be merely 
specific. 
The combination gives a natural genus having several species in 
the neotropical region. 
* Townsend, Ins. Ins. Menst., vol. 4, 1916, p. 6, had already designated Bengalia labiata as type, but 
this is no doubt the same species. 
