DIPTERA. 



or three joints of the hind tarsi yellowish-brown ; hind femora much thickened, the hind tibiae correspond- 

 ingly curved • hind coxa3 unarmed. Wings tinged with brownish, more strongly so distally. 



Female. Eront shining metallescent black, with a pollinose band across the middle. Second abdominal 

 segment with a median brown linear stripe. 



Length 10 millim. 



Hab. Mexico, Omilteme 8000 feet, Xucumanatlan 7000 feet, both in Guerrero 

 (H. H. Smith). 



Four specimens. 



This species has a markedly coarctate abdomen in the male, less so in the female. 

 It is nearest allied to X. angicstiventris, Loew (elongata, Willist.). 



3. Xylota stenogaster, sp. n., s $ . 



Male. Eace blaek or brownish-black, whitish-pollinose, variable in different reflections. Antennao blackish- 

 brown ; third joint large, oval ; arista yellow. Frontal triangle with a large shining spot. Mesonotum 

 opaque blue-black, with two narrow, purplish stripes. Pleuras blue-black, with white pile. Scutellum 

 somcwhat shining. Abdomen deep shining steel-bhie ; second and third segments each with a posterior 

 opaque blaek baud; second segment moderately narrowed, with concave sides. Legs brownish-black (or 

 black), the tarsi darker. except the middle metatarsi ; hiud femora considerably thickened ; hind coxae 

 with a slender, sharp spur. Wings on the basal half and behind subhyaline, on the distal half in 

 front blackish. 



Female. Eront shining black, with an obscure pollinose band. Second abdominal segment but little contracted, 



opaque, broadly shining on the sides, only a littie contracted. Legs black. 

 Length 10-11 millim. 



Hab. Mexico, Omilteme in Guerrero 8000 feet (/7. H. Smith); Guatemala, Purula 

 in Vera Paz (Champion). 



4. Xylota brachygaster, s P . n., 6 . 



Frontal triangle and face black, rather densely covered with white pollen, the cheeks and a spot above the 

 antennae bare and shining. Antennae black ; third joint more brown, scarcely longer than broad ; arista 

 yellow. Mesonotum opaque brownish-black, somewhat metallescent. Scutellum bronze. Abdomen 

 rather short and broad, with parallel sidcs : opaque black ; first segment coloured like the scutellum ; 

 second and third segments each with a ycllow spot on the lateral margin. Legs black, the knees 

 yellowish ; first joint of the four anterior tarsi and tho base of the second yellow ; hind femora 

 moderately thickened ; hind coxae unarmed. Wings with the frout border brown ; subhyaline behiud. 



Length 12 millim. 



Hab. Mexico, Omilteme in Guerrero 8000 feet (H. II. Smith). 

 One specimen. 



CEIOPEOEA. 



Crioprora, Osten Sacken, Cat. Dipt. 2nd ed. p. 251, note 241 (1878) • Williston, Synopsis N.-Am. 



Syrpliidte, p. 217. 

 Romaleosyrphus, Bigot, Ann. Soc. Ent. Fr. 1883, p. 356. 



1. Crioprora villosa. 



Romaleosyrphus villosus, Bigot, Ann. Soc. Ent. Fr. 1883, p. 356 \ 

 Hab. MEXICO 1 . 



