48 Transactions. — Zcology. 



Genus Calcager, gen. nov. 



Head rounded between the eyes, which are rather large 

 and bare. A pair of ocellar bristles directed outwards. Palpi 

 well developed.. Epistome not very prominent; front wide, 

 usually with two rows of fronto-orbital bristles ; facial ridges 

 bare or with slight hairs ; vibrissae above the edge of the 

 mouth. Antennae reaching rather below the middle of the 

 face ; the second joint conical, more or less elongated ; the 

 third joint less than twice the length of the second. Second 

 joint of the arista more or less elongated, sometimes as much 

 as one-half the length of the third joint, which is nearly bare. 

 Face considerably shorter at the vibrissae than at the base of 

 the antennae. Abdomen oval, with both marginal and discal 

 setae (macrochaetae). Wings with a strong and easily seen 

 bristle on the costa near the end of the auxiliary vein ; third 

 longitudinal generally setigerous at the base ; first posterior 

 cell open or closed, and ending before the tip of the wing. 

 Chief cross-vein opposite to or outside of the end of the first 

 longitudinal ; length of the fifth longitudinal from the pos- 

 terior cross-vein to the margin of the wing about one-half of 

 its length from the posterior to the basal cross- vein. 



The association of a costal seta with the elongated second 

 joint of the arista, the third joint of which is bare or nearly 

 so, is sufficient to separate this genus from Echinomyia and 



its allies. 



Key to the Species. 



Wings spotted . . . . . . • • .. C. apertum. 



Wings unspotted. 



Legs brownish-black . . . . • . .. C. turbidum. 



Legs testaceous. 



Shoulders brown or grey . . • . .. C. tcmerarium. 



Shoulders testaceous . • • ■ .. C. humeratum. 



Section A. 

 First posterior cell open, ending much before the tip 

 of the wing. Facial ridges with a row of fine hairs. Wing 

 with a cubital appendix, and strong bristles on the third 

 longitudinal vein. 



Calcager apertum, sp. nov. 



Head silvery, the face with a yellowish tinge; a dark- 

 brown frontal band from the ocelli to the bases of the 

 antennae Eves reddish-brown, slightly hairy. Antennae 

 dark reddish-brown, the first and. second joints with some 

 silvery tomentum. Proboscis and palpi dark-brown. Thorax 

 dark-brown, sprinkled with silvery tomentum; four short 

 black lines from the anterior edge. Scutellum dark-brown. 

 Abdomen dark greyish-brown with silvery reflections; the 



