88 DIPTEEA. 



lateral margins in part yellowish * the first and second segments entirely, and the successively narrower 

 sides of the third, fourth, and fifth segments, grey-pollinose, opaque. Legs, including the coxa? in part, 

 light yellow ; femora stout, distally with a double row of short spines below. Wings nearly hyaline ; 

 anterior cross-vein nearly opposite the tip of the auxiliary vein ; ultimate section of the fourth vein 

 sinuous, without stump : penultimate section about three times the length of the antepenultimate 

 section. 



Length 5 millim. ; of the wings, 7 millim. 



Hab. Mexico, Sierra de las Aguas Escondidas in Guerrero (H. H. Smith). 



Two specimens. 



4. Pipunculus subopacus. 



Pipunculus subopacus, Loew, Dipt. Centnr. vi. no. 74, in Berl. ent. Zeitschr. 1865, p. 176 \ 



Hdb. United States, Washington l . — Mexico, Chilpancingo in Guerrero, 4600 feet 

 (H. H Smith). 



A single female example from Mexico agrees so closelv witli the description of 

 P. suboj)acus, Loew, that I believe it belongs to that species. Almost the only discre- 

 pancy that the specimen shows is in the colour of the abdomen, which is deep coffee- 

 brown, with whitish-pollinose markings. The femora have no spinous bristles on the 

 underside, and the tibiae are not " fusco-annulated." 



5. Pipunculus aculeatus, sp. n., 2 ■ 



Eaco black, densely silvery-pubescent. Eront black, lightly pollinose. First two joints of antennse black ; 

 the third joint light yellow, produced below into a slender point. Thorax black, brownish-pollinose on 

 the dorsum, grey-pollinose on the pleurse. Abdomen shiniug black : first segment and the lateral margins 

 of the following segments opaque grey-pollinose ; ovipositor rcddish. Legs wholly light yellow, the 

 femora without bristly spines below. "Wings nearly hyaiine ; penultimate section of the fourth vein 

 more than twice the length of the antepenultimate section. 



Length 3 millim. : of the wings, 4 millim. 



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

 One specimen. 



6. Pipunculus flavicornis, sp. n., $ . 



' Front very narrow, the sides unusually convergent above ; the ground-colour black, but covered, like thc face, 

 with silvery pubescence, less distinetly so above. Antennse light yellow ; third joint obtusely pointed 

 below, ovate ; arista black. Thorax black, the dorsum dark brown-pollinose ; pleuras silveiy. Abdomen 

 opaque coffee-brown ; segments 2-6 broadly opaque silvery-grey on the sides, an interrupted posterior 

 band, more brownish in colour, extending across them ; first segment grey, narrowly brown in front • 

 ovipositor yellowish-red. Legs light yellow, including the coxbb, excepting only the terminal joint of the 

 tarsi, which is blackish ; the minute black spincs, arranged in longitudinal rows, are conspicuous. Wings 

 nearly hyaline ; penultimate section of the fourth vein more than twice as long as the antepenultim:ite 

 section ; small cross-vein opposite the tip of the auxiliary vein. 



Length 5 niillim. ; of the wings, millim. 



Hab. Mexico, Amula in Guerrero 6000 feet (//. //. Smith). 



One specimen. 



