DIPTERA. 229 



BRACHYPREMNA. 



Brachypremna, Osten Sacken, Berl. eut. Zeitschr. xxx. p. 162 (1886). 



1. Brachypremna dispellens. 



Tipula dispellens, Walk. Trans. Eat. Soc. Lond. n. s. v. p. 333 \ 

 Brachypremna dispellens, O. Sack. Berl. ent. Zeitschr. xxx. p. 162 2 . 



Hob. Noeth Ameeica, District of Columbia 2 , Texas 2 . — Mexico l , Teapa and Frontera 

 in Tabasco, Medellin in Vera Cruz (H. H. Smith). 



Six specimens, agreeing with O. Sacken's description. The species is included in 

 his list of unidentified Central-American Tipulidse (p. 19). 



2. Brachypremna similis, sp. n. 



c? . Very much like B. dispellens, but the legs are brown, with the kneea light yellow, &c. Front brownish- 

 yellow. Antenna? light yellow, the distal end and base of the first four flagellar joints black or brown. 

 Rostrum brown, the upperside, save the nasus, yellow. Palpi yellow, the last joint brown. Median 

 brown stripe of the mesonotum broad, separated by a linear yellow stripe in front, which broadens out 

 and forks back of the suture, enclosing a brown spot in front of the scutellum, and then continues as two 

 parallel stripes to the tip of the scutellum ; separating the median stripes from the broad lateral stripes 

 there is a narrow yellow stripe on each side, acute posteriorly ; sides of the mesonotum in front, and the 

 metanotum, light yellow, the latter with several small brown spots. Abdomen brown, the incisures 

 somewhat yellowish ; an indication of a median yellow stripe on the anterior segments. Legs dark 

 brown, the terminal joints of the tarsi yellow ; tip of femora and the immediate base of the tibiae light 

 creamy-yellow (the hind legs are wanting). Wings as in B. dispellens, the veins perhaps more infuscated 

 and the tip browner. Length 16-17 millim. 



Hah. Mexico. Teapa in Tabasco (//. H. Smith). 

 One specimen. 



RHYPHIM1 (p. 20). 



OLBIOGASTEE (p. 20). 



Olbiogaster ? (Tab. IV. fig. 6, s .) 



3 . Face on the lower part shining black, convex ; on the upper part, below the antenna?, whitish-pollinose. 

 Palpi and proboscis yellow. Antennae black, the first two joints yellow. Front and occiput black, rather 

 thickly white-pollinose. Mesonotum deep shining black, with rather long, sparse, white hair ; pleurae 

 shining black or pitchy-black, the upper part of the mesonotum white-pollinose. Abdomen flattened, 

 ribbon-like, widened distally ; deep black, moderately shining, with black hair ; the posterior margin 

 of each segment whitish and with white hair ; lamellae of hypopygium large, black. Legs yellow ; the 

 basal half of the four anterior femora, the hind femora wholly, the tip of the hind tibiae, and the 

 distal joints of all the tarsi, blackish or brown. Wings nearly hyaline ; the distal half of the marginal 

 cell, the subcostal before it, and a narrow cloud on the cross-veins, brown. Length 7-8 millim. 



Hah. Mexico, Atoyac in Vera Cruz (II. II. Smith). 



One specimen. I have compared it with a female of 0. cognatus, O. Sack., from the 

 Antilles, and find the structure almost identical throughout, save in the shape of the 

 abdomen, which is as given for the male of 0. cognatus by Osten Sacken. The antennee 



