MYIOSPILA.—HEMICHLORA. 503 
MYIOSPILA. 
Myospila, Rondani, Dipt. Ital. Prodr. i. p. 91 (1856). 
In this genus the apical cross-vein is not very conspicuous, the fourth vein being 
curved upwards at its extremity only and the apical cell widely opened exactly at (not 
before) the tip of the wing. From the following three genera, which have a very 
similar neuration, it is distinguished by the pilosity of the eyes. 
1. Myiospila meditabunda. 
Musca meditabunda, Fabr. Spec. Ins. ii. p. 444+; Syst. Antl. p. 297?; Meigen, Syst. Beschr. v. 
p-. 79°. 
Myospila meditabunda, Schiner, Faun. Austr., Dipt. i. p. 598%. 
Hab. Mexico, Ciudad in Durango (Forrer), Orizaba (H. H. Smith and F. D. Godman), 
Amula 6000 feet and Xucumanatlan 7000 feet, both in Guerrero (H. H. Smith).— 
Europe}. 
Several specimens of both sexes. They agree perfectly with European ones. 
HEMICHLORA, gen. nov.* 
Front flattened, not prominent, a little narrower than the eyes(@), longer than the face; frontal bristles 
weak; no orbital bristles. Cheeks narrow; vibrissee at the oral margin, which is slightly prominent ; 
some shorter bristles above and beneath them. Eyes bare, descending nearly to the inferior part of the 
head ; the median facets larger than the others. Antenne inserted on the median line of the eyes; third 
joint double as long as the second; arista long, short-plumose on the upperside only. Proboscis with 
retracted terminal lips; palpi cylindrical. Thorax quadrate, with rounded angles; dorso-central bristles 
distinct. Scutellum semicircular, with marginal macrochete. Abdomen short-ovate, broader than the 
thorax, without macrochete. Legs slender, with a few weak bristles ; no bristle on the inner side of the 
middle tibie. Tegule proportionately small. Wings longer than the abdomen; small cross-vein under 
the end of the first vein and a little beyond the middle of the discal cell ; curvature of the fourth vein 
rounded and near its termination ; apical cell widely opened at the tip of the wings. 
This new genus is established for Cyrtoneura vittigera, Big., which in many respects 
agrees with the second section of Cyrtonewra (in the sense of Schiner’s ‘ Fauna 
Austriaca’), or the genus Muscina, Rob.-Desv.; but differs in its peculiar coloration 
(testaceous, with the last segments of the abdomen metallic-blue) and in having the 
arista plumose on the upperside only +. 
According to Bigot, the male has a very narrow front and the eyes coalescent. 
* jue (half); yAwgds (green). 
Tt This most essential character is not mentioned either by Bigot or by Giglio-Tos. Mr. G. H. Verrall, who 
has acquired the collection of the late M. Bigot, has been kind enough to examine the typical (¢d) specimen 
of Cyrtoneura vittigera, and he informs me that it has the arista plumose on the upperside as in the female 
specimens before me. Dr. Giglio-Tos has also, at my request, examined the female examples described by 
him and finds that they have the arista similarly.formed. . Loe 
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