_ 
364 Prof. Westwood’s Descriptions of 
Monaoma, n. g. 
Corpus elongatum gracillimum, abdomine filiformi. 
Caput parvum collo tenui, thoraci affixum.  Palpi 
parvi capite breviores. Antenne gracillime 16-articu- 
late setis instruct, articulo 1mo ovali crassiori, 2ndo 
brevissimo; 8tio, 4to, et 5to longitudine 1mi fere 
wequalibus et sequentibus crassioribus, 6to et reliquis 
pergracilibus et fere zqualibus. Thorax parvus ovalis 
antice compressus. Ale elongate, anguste, vena 2nda 
paullo ante medium vene Ime emissa, et prope apicem 
ejus venula obliqua connexa; pone hance venulam 
furcata, parte superiori furce obliqua et costam inter 
apicem vene Ime et apicem ale attingente; parte 
inferiori furce ad apicem ale extensa; cellula discoidali 
extus venas 4 emittenti duabus intermediis brevioribus 
et subeque longis; basi cellule cum vena recurrenti 
continua; vena 5ta apice obliqua et apicem vene 6tx 
conjuncta in marginem posticum ale. Pedes longissimi 
eracillimi; femoribus anticis supra spinulis duabus, 
extus directis, haud longe pone caput armatis; tibiis 
apice ecalcaratis. Tarsi unguibus elongatis acutis 
parum curvatis et prope basin paullo dilatatis ; empo- 
dium carentibus. 
Mongoma fragillima. (Pl. XVIL., fig. 1). 
Piceo-nigra, thorace dilutiori; alis parum infuscatis 
pseudostigmate obscuriore; pedibus fuscis, geniculis, 
tibiarum apice, tarsisque integris albis. Long. corp. 
44 lin. Expans. alar. 83 lin. Long. ped. singul. 19 lin. 
Hab. Mongoma Lobah, Africa tropicali. In Mus. 
Hopeiano Oxonie (D. Hornimanno communicata). 
I am indebted to the Baron Osten-Sacken for the 
following notes on the relations of this singular little 
species :— 
““The systematic position of this species is very 
puzzling, and I regret that I did not give it more 
attention when you showed it to me. It is important to 
know whether it has spurs at the tip of the tibiz and a 
distinct empodium between the claws. If there are no 
spurs, and the empodium is present, the species may 
belong in the vicinity of my genus Hmpeda (Monogr. 
N. Am. Dipt., vol. iv. p. 193). An important difference, 
however, and a very striking character of your species, 
