96 DIPTEKA. 



more yellowish with feebly indicated markings. Legs rather stout, variable in colour the four anterior 

 femora often largely black, fhe hind femora usually iu great part black; Ubi» and tarsi brown and 



uarrow above, shining blue-black, the sides below yeUow. Face with a broad black stripe. 

 Abdomen shining black ; second segment with two small yellow spots ; third, fourth, and nitn segments 

 each with a pair of oblique yellow spots on the anterior half . Legs yellow ; four anterior tarsi browmsh ; 

 hind femora with a preapical brown ring ; hind tibiee with a sub-basal and a preapical brown nng ; hind 

 tarsi brown. 

 Length 5-6 millim. 



Hab. Mexico, Acaguizotla 3500 feet, Chilpancingo 4600 feet, Tepetlapa 3000 feet, 

 Medellin near Vera Cruz, Teapa in Tabasco (H. H. Smith), Orizaba (H. H. Smith and 

 F. D. Godman). 



I am not quite sure that the females here described belong to the same species as 

 do the males, but I think so. An additional female has the abdomen wholly, and the 

 hind legs in great part, black. Still another has the sides of the second abdominal 

 segment yellow, and the hind legs in great part black. The tip of the scutellum is 

 rarely somewhat yellowish. 



5. Mesogramma ? 



Male. Very similar to the preceding species, but differing iu the more prominent face, the narrower vertical 

 triangle, the black of the hind legs confined to a preapical ring, the less elongate abdomen, and the second 

 segment with a large oval opaque spot. 



Female. Abdomen shining blue-black ; second segment with an opaque black band, not reaching the lateral 

 margins, in front of which there is a narrow, broadly interrupted yellow band ; third, fourth, and fifth 

 segments each with three yellow spots or stripes, not reaching the hind margin— the middle one of which 

 is more slender, wanting on the fourth, and separated by two linear opaque black stripes,— and on each 

 side lateraliy with a larger, rounded, opaque black spot, Face more brownish in the middle ; front 

 narrow above. 



Length 5 miUim. 



Hab. Mexico, Dos Arroyos 1000 feet, Tepetlapa 3000 feet, both in Guerrero, Vera 

 Cruz, Atoyac and Medellin in Vera Cruz, Teapa and Frontera in Tabasco (H. H. Smith), 

 Orizaba (H. H. Smith and F. D. Godman). 



6. Mesogramma ? 



Male. Vertical triangle very long, narrow, shining purple behind the ocelli. Frontal triangle and face smaU, 

 yeUow, the latter prominent ; antennae yellow ; cheeks black. Mesonotum deep shining black, with a 

 whitish median line and complete yeUow lateral stripes. Scutellum shining black, with the margin 

 broadly yellow. Pleurte shining blue, with a vertical stripe on the meso- and sterno-pleura? yeUow. 

 Abdomen shining yellow and black ; first segment narrowly black behind ; second segment with the 

 posterior third black ; third and fourth segments yeUow in front and black behind, the demarcation between 

 the yellow and the black irregular and variable in outline ; the black on the fifth segment forming three 

 stripes; hypopygium rather large, shining black. Legs yeUow ; hind femora with a preapical, and the 

 hind tibia- with a median, black ring. Abdomen elongate oval, somewhat narrowed ou the second segment. 

 Alulse rudimentary. 



Female. Front unusuaUy narrow ; shining purple behind the ocelli, with a median black stripe in front. 

 Length 6-7 millim. 



Hab. Mexico, Teapa in Tabasco (H. H. Smith). 



