a Genus of Dipterous Insects. 295 



assertion that his insect was identical with the D. Ichneumonea,) has Bengal ; 

 whilst Dalman, ignorant of the true existence of any East Indian species, says, 

 " Veri tamen videtur simile D. Ichneumotieam habere patriani Guineam, cum 

 omnes hucusque rite cognitae species hujus generis sint cives istius regionis." 

 By recurring, however, to the Linnsean species of Paussus, the doubts may in 

 some degree be diminished. Linnaeus received both insects from the same 

 source ; Afzelius, after much inquiry, discovered that the Paussus was taken at 

 the Bananas, or the adjacent part of Sierra Leone and tropical Africa. Now 

 the insect which I have described under the name of D. collaris, and which is 

 the only species with the transverse subapical fascia on the wings whose habi- 

 tat is clearly known, is from Senegal. Hence, therefore, from all the pre- 

 ceding circumstances, together with the fact that no true Diopsis has been 

 found in the New World, I think we may safely consider that Linnaeus's insect 

 was from Guinea, or some other part of the coast of tropical Africa. 



Species 2. Diopsis collaris, mihi. 

 Tab. IX. Fig. 2. 



D. rufo-testacea, thorace (nisi collari rufo) nigro, alls macula transversa, ante 



apicem posita femoribus 4 posticis inermibus. 

 Long. corp. lin. 3^. Expans. alar. lin. 6. 

 Habitat in Senegallia Africse. In Mus. nostr. 



Statura D. apicalis at brevier. Individuum nostrum e forma abdominis foemi- 

 ninum esse videtur. Caput rufo-testaceum, glabrum, nitidum, versus os 

 attenuatum, ibique emarginatum et utrinque spina minuta acuta paull6 

 divergenti armatum. Haustellum fuscum. Fades convexa, sulculo Ion- 

 gitudinali tenui lineaque arcuata fusca in pedunculos oculiferos terminata, 

 alteraque arcuata supra os. Regio ocellorum nigra. Pedunculi cum oculis 

 capite et thorace conjunctim paull6 breviores, obscur^ ferruginei, apice 

 nigri. Spina intei-media brevissima, pone medium sita. Spina terminalis 

 krh obsoleta. Antennce fulvse : setd apicali nigra. Oculi nigri, ad basin 

 ferruginei. Collars rufescens, ad latera postice dilatata. Thorax niger, 

 nitidus, supra vix sericeus, subttis magls sericeo-cinerascens. Scutellum 

 thoraci concolor. Spince scutellares flavse, graciles (apicibus in specimine 



