8 



DIPTEKA. 



CHILOSIA. 



Cheilosia, Meigen, Syst. Beschr. iii. p. 296 (1822). 

 Cartosyrphus, Bigot, Ann. Soc. Ent, Fr. 1883, p. 230. 



Bynopsis of the Central-American species. 



1. Eyes hairy .2. 



Eyes bare 3. 



2. Shining bronze, with abundant golden pile chrysochlamys, sp. n. 



Shining green, with sparse, lighter pile sororia, sp. n. 



3. Mesonotum shining black sororcula, sp. n. 



Mesonotum and abdomen opaque black frontosa, Bigot. 



1. Chilosia chrysochlamys, sp. n., d 1 $ . (Tab. I. figg. 4, ? ; 4 a, head.) 



Male. Eyes with long, light pile, broadly contiguous. Frontal triangle not swollen, thinly pollinose, and 

 with yellow pile and a slender median groove. Antennse red, the first two joints darker ; third joint 

 rounded, not large ; arista black, bare. Face shining black, bare, save on the outer side of the well- 

 marked lateral grooves ; whitish-pollinose above and on the orbits ; in profile, the well-developed tubercle 

 not projecting beyond the base of the antennsc. Mesonotum shining bronze, with long, reddish-yellow 

 pile. Scutellum similarly coloured and pilose; without bristles. Abdomen shining bronze, like the 

 mesonotum ; first segment subshining green ; second segment, except the sides and narrow hind margin, 

 opaque black ; third segment with a large opaque triangle ; pile long, abundant (especially posteriorly), 

 semi-recumbent, golden-yellow ; on the sides in front white. Venter subshining, black, with yellowish 

 hind margins to the segments ; pile white and light yellowish. Teguloe white, light yellow-ciliate. Legs 

 black, white-pilose ; base and tip of all the tibite, and the articulations of the anterior tarsi more or less 

 red. "Wings tinged with yellowish and brownish. 



Female. Front subshining, with lateral grooves and yellow pile ; third joint of antennse a little larger, sub- 

 quadrate ; facial tubercle more prominent. Abdomen more oval, wholly shining bronze, except the first 

 segment ; and with abundant, recumbent, golden pile, as in the male. 



Length 12 millim. 



Hab. Mexico, Omilteme 8000 feet, Sierra de las Aguas Escondidas 9500 feet, both 

 in Guerrero (H. H. Smith). 



Five specimens. 



The only North-American species with which this may be confounded is C. lasi- 

 ophthalma, Willist,, from which the facial profile, opacity of the male abdomen, and the 

 long yellow abdominal pile will at once distinguish it. 



2. Chilosia sororia, sp. n., $ . 



Eyes clothed with a short, sparse pile. Front shining metalHc, yellowish-pollinose and with yellowish pile; 

 a distinct groove on either side. Antennse red ; arista black, bare. Face shining black, bare, save ou 

 the narrow orbits ; whitish-pollinose above ; in profile with a strongly protuberant tubercle projecting 

 beyond the baso of the antennse. Mesonotum shining metallic green, with bronze reflections ; pile short, 

 sparse, yellowish. Scutellum without bristles. Pleura3 with white pile. Abdomen shining metallic, 

 with yellowish or whitish pile. Legs with white pile ; femora, except the tips, black ; for the rest the 

 legs are yellowish-red, except the tips of the tarsi, which are somewhat blackish. Wings greyish-, or 

 slightly yellowish-, hyaline. 



Length 8-9 millim. 



