1937 ] 
Exotic Syrphid Flies 
15 
Wings hyaline, stigma brown. A deep loop of third 
longitudinal vein into first posterior cell; the marginal cell 
closed before the apex of first longitudinal vein, and the 
first posterior cell closed before apex of third longitudinal 
vein. 
Length 10 mm. 
Three co-types. Males. One is from Mandritsara, Mada- 
gascar (Wulsin) whose type no. is 2270 in the Museum of 
Comparative Zoology. The two others, Antananarivo, 
Madagascar, were discovered in the collections at the Mu- 
seum fur Naturkunde, Berlin. Dr. G. Enderlein has kindly 
presented me with one of them, which is in my own collection. 
The third is in his collection. 
The first specimen studied, from the Museum of Com- 
parative Zoology, curiously bears no evidence of the spotted 
eyes, and I was inclined to view this species as nearest to 
Protylocera. The discovery of subsequent specimens reveals 
that the eyes are generously spotted. Nevertheless, the 
distinctive type of abdomen, much enlarged hypopygium, as 
well as the excised tibia and nodulate hind femora show that 
it is not an ordinary Lathy rophthalmus. Another species 
which Speiser placed under Lathy rophthalmus, myiatro- 
pinus, agrees in these peculiarities and differs from the 
present species in its dark terminal segments, etc. The two 
forms may very well be grouped under the name given, since 
besides the other distinctions mentioned, they lack either the 
metallic color or the characteristic stripes of Lathyroph- 
thalmus. It may be remarked that the spotted nature of the 
eyes probably shows no close relationship to Lathyrophthal- 
mus whatever, since at the present no less than five genera 
show such spots. Three genera show the enormous hypo- 
pygium: Meromacroides of Curran (Africa), Meromacrus 
Rondani (S. America) and the present group of species. 
Lathyrophthalmus vitrescens n. sp. 
Plate II, fig. 4 
Female. Eyes distant by one and one-half times width 
of posterior ocelli ; side of front diverging considerably 
towards antennae. Front yellow and grey-brown pollinose, 
varying according to direction, but apparently with a con- 
