78. DOLICHOPUS PROVENIENS, n. s. _Foem._ Obscure viridis, capite albo, antennis nigris thorace vittis duabus pectoreque cinereis, abdomine cyanescente-viridi fasciis cupreis, pedibus nigris, femoribus anterioribus apice tibiisque fulvis, alis nigricantibus, halteribus fulvis. _Female._ Dark green; head white in front and about the eyes; antennæ black; 3rd joint round; arista shorter than the breadth of the head; thorax with two cinereous stripes; pectus cinereous; abdomen bluish green, with cupreous bands; legs black; tibiæ and tips of anterior femora tawny; wings blackish; veins black; præbrachial vein quite straight; discal transverse vein straight, parted by twice its length from the end of the subanal vein; halteres tawny. Length of the body 2 lines; of the wings 4 lines. Gen. CHRYSOTUS, _Meigen_. 79. CHRYSOTUS EXACTUS, n. s. _Mas._ Obscure viridis, cinereo-tomentosus, antennis pedibusque nigris, abdomine obscure cupreo, tibiis anticis fulvis, alis cinereis. _Male._ Dark green, with cinereous tomentum; antennæ black; 3rd joint conical; arista much shorter than the breadth of the head; abdomen dark-cupreous; legs black; fore tibiæ tawny; wings grey; veins black; præbrachial vein hardly bent exteriorly; discal transverse vein parted by more than four times its length from the end of the subanal vein. Length of the body 1-1/4 line; of the wings 2 lines. Gen. DIAPHORUS, _Meigen_. 80. DIAPHORUS RESUMENS, _Wlk._ See Vol. 11. p. 93. Fam. LONCHOPTERIDÆ, _Curtis_. Gen. CADREMA, n. g. _Mas. Corpus_ breviusculum, sat gracile. _Caput_ thorace vix angustius; facies subobliqua. _Antennæ_ brevissimæ; arista apicalis, longa, subpubescens. _Abdomen_ ovatum, thorace vix longius. _Pedes_ posteriores robusti; tibiæ posticæ calcare apicali arcuata. _Alæ_ angustæ lanceolatæ. _Male._ Body rather short and slender; head nearly as broad as the thorax; face slightly oblique. Antennæ extremely short; arista long, apical, minutely pubescent. Abdomen oval, hardly longer or broader than the thorax. Posterior legs stout; hind tibiæ with a curved apical spur. Wings narrow, lanceolate; cubital vein and præbrachial vein parallel, the latter ending at the tip of the wing; discal transverse vein straight, ending at full thrice its length from the border and at nearly thrice its length from the præbrachial transverse. 81. CADREMA LONCHOPTEROIDES, n. s. _Mas._ Testacea, antennis luteis, thoracis disco et metathorace nigris, abdomine apicem versus nigricante, alis vitreis macula apicali nigricante. _Male._ Testaceous; antennæ luteous; disk of the thorax and metathorax black; abdomen blackish towards the tip; wings vitreous, with a blackish apical spot; veins black, testaceous towards the base. Length of the body 1-3/4 line; of the wings 4 lines. Fam. PLATYPEZIDÆ, _Haliday_. Gen. PLATYPEZA, _Meigen_.