a Genus of Dipterous Insects. 307 
Long. corp. lin. 3$. Expans. alar. lin. 74- 
Long. sing. ocul. pedunc. lin. 3. 
Habitat in Africa Occidentali. In Musso Dom. Curtis, olim in Muszo 
Dom. Lee. 
Descr. Nova species D. macrophthalme affinis, sed facie spinosà ceterisque 
differt. Caput testaceum, fronte lineáque arcuatà subelevatà transversa 
subnigra, os versus dente valido armatum. Cornua oculifera longitudine 
thoracem cum abdomine zquantia, obscure testacea, apice nigricantia ; 
setis et antennis deteritis. Oculi obscuri. Thorax niger, nitidus: collari 
concolore. Scutellum testaceum; spinis 2 concoloribus (apicibus de- 
teritis). Spine metathoracice 2, parvae, flavee. Abdomen thorace duplo 
longius, subclavatum, sordidé testaceum, pilosum, basi excavatione ob- 
longá notatum. Pedes testacei, graciles, femoribus anticis vix incrassatis, 
posticis apice spinigeris (saltem in pare ultimo).  Tibic et tarsi pedum 
duorum anticorum obscuriores tibiisque duabus posticis basi et apice in- 
fumatis (rudimentum annuli pallidi exhibentibus). -d/e hyaline, imma- 
culate, apice vix obscuriori. Halteres pallidi. 
This very distinct species (which is in the cabinet of J. Curtis, Esq., F.L.S., 
by whom it has been kindly submitted to my examination, with a suggestion 
of the name which I have adopted above,) is very interesting from combining 
immaculate wings with armed femora and sides of the face, a combination 
which I have observed in no other species. 
Species 17. Diorsis OBSCURA, mihi. 
Tas. IX. Fig. 16. 
D. nigra, abdomine postice pedunculis oculiferis tibiisque anticis fuscis, pedi- 
bus fusco-rufescentibus, tibiis posticis fuscis in medio annulo pallido. 
Long. corp. lin. 24. Expans. alar. lin. 33. 
Habitat in Sierra Leoni. Afzelius. In Mus. Soc. Linn. Lond. 
Species parva, coloribus obscuris distincta. Caput nigrum, facie fuscá subtüs 
inermi. Pedunculi oculiferi thorace paullo breviores, crassi, fusci, apice 
nigri. Oculi obscuri. Antenne fusce. Thorax niger; collari scutello- 
que concoloribus. Spine metathoracice 2, nigre; scutellares scutello 
VOL. XVII. 2s 
