40 



DIPTEEA. 



MYIOLEPTA. 



Myolepta, Newman, Ent. Mag. v. p. 373 (1838). 

 Xylotaja, Rondani, Dipt. Ital. Prodr. ii. p. 96 (1857). 



L Myiolepta auricaudata, s P . n., e 2 . (Tab. t figg. U, ; 11 m head 5 



11 hind leg.) 



Male. Allied to M. strigilata, Loew. Body clothed with sparse white or yellow tomentum, this being longer, 

 dcnse, and brassyon the terminal abdominal segments. Yertical triangle long, opaque white m front; 

 contiguity of the eyes short. Face and front clothed with dense white pollen and some golden tomentum 

 on the frontal triangle ; a broad, shining, bare spot above the base of the antennae; a transverse band on 

 the face, extending down on the tubercle, and the cbeeks also, bare and shining black. Tomentum of the 

 mesonotum golden-yellow, arranged in indistinct rows. Second abdominal segment and the anterior part 

 of the third with the tomentum more sparse, apparently bare in certain lights ; on the posterior part of 

 the third segmont and on the fourth the tomentum is longer, dense, bright brassy-yellow, concealing the 

 ground-colour. Legs black; the base of the middle and hind tibise, the middle metatarsi, and the hind 

 metatarsi in part, light yellow or white ; femora thickened and with spinules below. Wings subhyaliue, 

 clonded with brownish distally. 



FemaU. Front black, with sparse white tomentum and two small, oval, white-pollinose spots on each side ; face 

 shining black, with an infra-antennal band and a narrow stripe from the eye to the oral margin white- 

 pollinose. Tomentum of the mesonotum more white. 



Length 6-7 millim. 



Eab. Mexico, Xucumanatlan in Guerrero 7000 feet, Cuernavaca in Morelos (7/. H. 

 Smith). 



Two specimens. 



Apart from the striking difference of the tomentum on the abdomen, this species 

 differs from M. strigilata (female) in the front being narrower above, ancl in the darker 

 antennse, the absence of facial spot, darker legs, &c. 



RHINGIA. 



Rhingia, Scopoli, Ent. Carniol. p. 358 (1763). 



1. Ehingia nigra. 



Rhingia nigra, Macq. Dipt. Esot. l er Suppl. p. 133, t. 11. f. 10'. 



Hab. Mexico, Teapa in Tabasco (H. H. Smith). — Soxjth America, Colombia K 



PHAL ACROMYIA . 



Phalacromya, Rondani, Studi Ent. p. 67 (1848). 



Synopsis of the recognized Central-American species. 



1. A distinct transverse impression before the tip of the scutellum . 2. 

 Scutellum convex throughout 3. 



2. Light-coloured species ; scutellum witli strong bristles on the 



lateral margins virescens, sp. n. 



