344 Professor Aldrich on the 



cell behind. The branch of the fourth vein makes an acnte angle 

 at its origin ; third vein not recurved forward at its tip. Posterior 

 cross-vein a little oblique, somewhat bicurved, less than half its 

 length from the margin. 



$ . Front scarcely ciliated, black bands of abdomen slightly- 

 wider ; bristles of body shorter ; those of fore tibiae the same as 

 in the male. The middle tibiae also have large bristles, arranged 

 on the same plan. Fourth joint of middle tarsus black ; fore and 

 middle tarsi rather darker than in the male. 

 Length 4 mm. ; of wing, the same. 



Altitude 500 feet. May. Four males and six females. 

 In immature specimens the wings are hyaline. 



4. Fsilojpiis insidarisj n. sp. 



Wings hyaline, tegular cilia black, legs including fore coxse 

 yellow, middle metatarsus of male ciliated. 



(^. Face wide bluish-green with silvery pollen. Palpi black, 

 with black hairs ; proboscis yellow. Front wide and deeply 

 excavated, bright blue or green. Antennae black, the third joint 

 rather long, rounded at the end. Arista dorsal, slender, rather 

 long. In less mature specimens the third antennal joint is more 

 or less shrivelled. Thorax bright blue-green, scutellum more violet. 

 From above the root of the wing a distinct black stripe reaches 

 the humerus, becoming attenuated anteriorly. Pleurae green, 

 white-dusted. Tegulae and their cilia black. Halteres yellow. 

 Bristles of moderate size, four large ones on the scutellum. 

 Abdomen metallic-blue and green, with black bands nearly half the 

 width of the segments. Hypopygium black, small, at the tip with 

 a pair of small forcep-like organs of sordid grey colour. Bristles 

 and hair of abdomen rather long, black, at the sides basally the 

 hair is white. Legs wholly yellow, the tarsi but little darker. 

 Front coxae yellow with fine yellowish hair, and near the end two 

 black bristles. Middle and hind coxae black; the former with 

 white hairs and one or two black bristles, the latter on the outside 

 with a single black bristle and a few white hairs. Front and 

 middle metatarsi longer than their tibiae, the middle one with a 

 dense row of short, blunt, slightly curved cilia on the upper edge. 

 On the front side is a row of five or six small erect bristles. 

 Hind tibise unusually hairy. This peculiarity extends over the 

 metatarsus and decreases on the following joints. Wings hyaline ; 

 posterior cross-vein straight, not very oblique, distant two-thirds 



