DIPTERA. 



determination is correct, inasmuch as the abdomen is nearly black, save upon the 

 margins, and not " red or brownish-red." The mesonotum, moreover, has the " coale- 

 scent stripes " united. The Guerrero example agrees with the description otherwise, 

 and especially does it agree with my recollection of the antennse, which have a peculiar 

 basal dilatation of the third joint. The scutellum is nearly triangular. 



5. Microdon ? 



Hab. Panama, Taboga Island (Ckampion). 



A single male specimen, without head. The mesonotum is reddish-yellow, with a 

 black disc, the moderately elongate abdomen red, the legs yellow, with the tip of the 

 hind tibise and the hind tarsi, in part, brownish ; the hind tibise are dilated and ciliated. 

 The wings are small and nearly hyaline. It may belong to the species mentioned by 

 me in my Synopsis, p. 8. 



6. Microdon ? 



Hab. Guatemala, San Geronimo (Champion). 



A female specimen, which resembles structurally M. falcatus ; but it has the third 

 antennal joint regular, and the scutellum less triangular in shape, the emargination 

 more distinct. The colour is light translucent yellow, the antennse and legs black ; 

 the wings are strongly pubescent, and the mesonotum has three coalescent black 

 stripes. 



7. Microdon niger, sp. n., s . (Tab. I. figg. 3, 6 ; 3«, head.) 



Face rusty-black, with rusty and white pile, not at all shining ; front black, not shming, except about the 

 antennse, its least width about four-fifths of the distance from the foreinost ocellus to the antennae. 

 Antennte black, the first joint slightly reddish ; elongate, slender, the third joint cylindrical, and a little 

 longer than the first two jointss together. Eyes bare. Thorax and abdomen deep, opaque, brownish- 

 black, finely roughened, bare. Scutellum with two rather small points. Abdomen narrowed, elongate, 

 the second segment the widest, thence gently tapering ; f ourth segment about as long as the first three 

 segments together. Pleurse and the stout legs deep brown. Wings dark blackish-brown ; the distal 

 fourth yellowish-white, with light-coloured veins, the extreme tip clouded ; terminal section of the fourth 

 vein and the posterior cross-vein without stumps. 



Length 14 millim., of the antennse 3| millim. 



Hab. Mexico, Panima in Vera Paz (Champion). 



One specimen. This species, like its congener M. mirabilis, Willist., is remarkable 

 for its black and light yellow wings. It is not impossible that, as in M. miraUUs, the 

 two sexes may differ in the wing-markings. 



