a Genus of Dipterous Insects. 307 



Long. Corp. lin. 3f . Expans. alar. lin. 74- 

 Long. sing. ocul. pedunc. lin. 3. 



Habitat in Africa Occidentali. In Musseo Dom. Curti.s, olim in Musteo 

 Dom. Lee. 



Descr. Nova species D. macrophthabna; afRnis, sed facie spinosa caeterisque 

 differt. Caput testaceum, fronte lineaque arcuata subelevata transversa 

 subnigra, os versus dente valido armatum. Cornua ocultfera longitudine 

 thoracem cum abdomine sequantia, obscur^ testacea, apice nigricantia ; 

 setia et antennis deteritis. OcitU obscuri. Thorax niger, nitidus : collari 

 concolore. Scutellum testaceum ; spinis 2 concoloribus (apicibus de- 

 teritis). Spince metathoracicce 2, parvse, flavse. Abdomen thorace duplet 

 longius, subclavatum, sordid^ testaceum, pilosum, basi excavatione ob- 

 longa notatum. Pedes testacei, graciles, femoribus anticis vix incrassatis, 

 posticis apice spinigeris (saltern in pare ultimo). Tibiae et tarsi pedum 

 duorum anticorum obscuriores tibiisque duabus posticis basi et apice in- 

 fumatis (rudimentum annuli pallidi exhibentibus). Alee hyalinae, imma- 

 culatse, 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 

 innnaculate wings with armed femora and sides of the face, a combination 

 which I have observed in no other species. 



Species 17- Diopsis obscura, mihi. 

 Tab. IX. Fig. 16. 



D. nigra, abdomine posticfe pedunculis oculiferis tibiisque anticis fuscis, pedi- 

 bus fusco-rufescentibus, tibiis posticis fuscis in medio annulo pallido. 



Long. Corp. lin. 2J. Expans. alar. lin. 3|. 



Habitat in Sierra Leona. Afzelius. In Mus. Soc. Linn. Lond. 



Species parva, colorlbus obscuris distincta. Caput nigrum, facie fusca subtus 

 inermi. PeduncuU oculiferi thorace paull6 breviores, crassi, fusci, apice 

 nigri. OcuU obscuri. Antennce fiiscse. Thorax niger ; collari scutello- 

 que concoloribus. Spime metathoracicce 2, nigrse ; scutellares scutello 



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