﻿Boiithi/ludac {iJipicrn) from Cndral Africa. 027 



joint with a sliort pniut ami a ratlier long style. Thorax with l)lack 

 hairs, in front also; the side shows an entire white longitudinal 

 stripe, which is continuous with the white spots on the indentation 

 of the hind margin of the eyes; pleurae wholly lilack-haii'ed, some- 

 times a few pale hairs in the j^osterior part of the nietapleural tuft. 

 Scutellum black. Haltères brownish. Abtlomen black ; on the 

 sides at the base are white hairs ; the third segment bears at base an 

 entire but narrow transverse band of white hairs ; the sides of the 

 abdomen bear dense tufts of black scaly hairs. Legs wholly black, 

 witli Ijlack bristles and black pubescence. Wings hyaline, with 

 black veins ; the base is black as far as the basal cross-veins ; 

 costal cell darkened ; the small cross-vein is broad and with a narrow 

 dark margin. Squamulae witli a white fringe. 



Type Ç and four additional specimens from North 

 Nyasa, Nyika Plateau, Rongorwi stream, Augtist 29, 1909 

 {Dr. J. B. Davey). 



36. ThyruUinthra.y. ahriiptaf., Loew (1860). 



Allied to the preceding, but showing a more extended 

 dark pattern on the wings. The hairs on the front of the 

 thorax are yellow. Squamulae with a yellowish fringe. 

 Metapleural hairs ])artly black. Wing veins black. 



A specimen from North Nyasa, Kabwiia stream, 

 August 81, 1909 {Dr. J. B. Davey); another from West 

 Nyasa, Momberas District, October 1909 {Dr. H. S. 

 Sf annus); and one from Northern Nigeria, Minna, 

 October 10, 1910 {J. J. Simpson). 



37. Thyridanthrax sp. indet. 



A single badly-preserved specimen of a grey species, the 

 wings of which are hyaline, with the extreme base only 

 black. I think that is only a form of the Mediterranean 

 T. vagans, Loew. 



North Nyasa, Vua, October 28, 1909 {Dr. J. B. Davey). 



38. Thyridanthrax sp. indet. 



A single specimen of another smaller species, allied to 

 tlie preceding one and to T. leucoproctns, Loew (1860), from 

 the Cape. 



North Nyasa, Bundi Yillnge, Fuliwa, May 13, 1909 

 {Dr. J. B. Davey). 



lo. Isotamia, gen. nov. 



Type : Isotamia daveyi, sp. nov. 



This genus can be regarded as an Exoprosop)a with very 

 long proboscis and very narrowed wings, which are almost 



