DIPTEEA. 295 



band, beginning ac the first vein at the tip of the auxiliary vein and passing across the marginal, 

 submarginal, and first posterior cells, and nearly connected with a spot in the discal cell, and across the 

 base of the third posterior cell ; beyond this hyaline band there is a narrow, irregular, brown, arcuate 

 band, beginning at the second vein, passing over the first section of the anterior branch of the third vein, 

 the middle of the first posterior cell, the subangulated posterior cross-vein, and reaching the tip of the 

 anal cell ; the narrow outer margin of the wing and the anal and axillary cells are subhyaline. Length 

 7 millim. 



Hab. Mexico, Amula in Guerrero (H. II. Smith). 

 One specimen. 



ECLIMUS (p. 161). 



2. Eclimus fascipennis, sp. n. (Tab. V. fig. 9, $ .) 



$ . Front opaque black, with long black pile and short, closely-set, bright golden pile ; on the lower third or 

 more and the face densely white-pollinose ; cheeks and the oral margin shining black. Antennae black ; 

 third joint longer than the first, broad at the base, pointed distally, and with a minute style at the tip. 

 Proboscis as long as the head and thorax together, black. Palpi about one-fourth the length of the 

 proboscis, black ; the second joint about two-thirds the length of the first, with an attenuated tip, as 

 though a small third joint were present. Occiput with golden pile and long yellowish hair ; opaque 

 grey below, opaque black above. Mesonotum opaque black, with the lateral margins and a median 

 stripe, expanded posteriorly, of close-lying golden pile ; everywhere with long, sparse, dusky pile. 

 Pleura densely white-pollinose, with white hair and a little golden pile. Scutellum covered with golden 

 tomentum. Knob of the halteres black. Abdomen opaque black; the first four segments with 

 golden tomentum, the distal segments with white pile, intermixed with longer and coarser black hair, 

 which forms a fringe at the tip ; venter whitish, with white hair. Legs wholly black. Wings nearly 

 hyaline, with two narrow, partly confluent, brown bands beyond the middle, connected in the marginal 

 cell, and with a small spot at the anterior basal cross-vein and another at the origin of the third vein ; 

 costal margin at the tip narrowly clouded. Length 9-11 millim. 



Hab. Mexico, Tepetlapa and Chilpancingo in Guerrero (H. H. Smith). 

 Seven specimens. 



3. Eclimus quadratus, sp. n. 



$ . Front black, opaque on the upper portion, with recumbent white pile and longer black hair ; on the 

 lower portion, to the upper part of the face, thickly white-dusted ; oral margin, more broadly so than 

 in E. fascipennis, and the cheeks, shining black. Antennas and proboscis in colour and structure like 

 those of the preceding species ; second joint of the palpi relatively shorter. Mesonotum opaque black, 

 the lateral margins and a median line with recumbent white pile, less abundant than in E. fascipennis. 

 Pleura? brown, with white hair. Abdomen opaque black ; first four segments with sparse golden pile, 

 the fifth with white pile, the other segments with longer, more abundant, and wholly black hair. 

 Femora and tibia? red or brownish-red, the tip of the latter and the tarsi blackish. Wings hyaline, 

 with a broad, quadrate, brown spot, lighter-coloured in the interior of the cells ; a large spot in the 

 proximal half of the first basal cell, and a small cloud on the anterior basal cross-vein, also brown ; 

 costal and subcostal cells yellow or brown. Length 10 millim. 



Hab. Mexico, Bincon in Guerrero (II. II. Smith). 



SPHENOIDOPTEBA, gen. nov. 



5 . Head broader than the thorax ; front broad, with a median longitudinal groove ; face short, its profile 

 continued in the line of the lower part of the front, the sides narrow, the oral margin at about an angle 

 of forty-five degrees with the occiput. Proboscis extending about as far outward as the tip of the 



