SAEAPOGON.— LASTAURUS. 179 



SAEOPOGON. 



Saropogon, Loew, Linn. Ent. ii. p. 439 (1847). 



1. Saropogon senex, sp.n., <?. 



Black, including the legs ; head and thorax grey-pollinose ; wings brown. 

 Length about 9 millim. 



Hob. Mexico, Presidio (Forrer). 



Face silvery-grey, almost white ; bristles of the mystax black ; front and occiput 

 thickly grey-pollinose, with black bristles. Thoracic dorsum and pleurae thickly grey- 

 pollinose ; in the middle of the dorsum the place of the usual stripes is indicated by a 

 less dense pollen, showing more of the blackish ground-colour; macrochaetae black. 

 Knob of the halteres pallid whitish, the stem brownish at the base. Abdomen, including 

 the genitals, shining black, with a bluish reflection. Legs black, shining. Wings brown, 

 lighter at the tip; fourth posterior cell closed near the margin. — A single specimen. 



N.B. — In front of the mesothoracic suture (that is, in the angle formed by it and the 

 dorso-pleural suture) I perceive three praesutural macrochaetae and even a small fourth 

 one. In the European specimens of Saropogon which I can now compare I perceive 

 but two praesutural macrochaetae. 



The following species from our region have been referred to the genus Saropogon by 

 previous writers, but seem to be of doubtful position : — 



Saropogon bicolor, Jaennicke, Neue exot. Dipt. p. 49. — Panama. 

 Dasypogon nigripennis, Macq. Dipt. Exot. Suppl. ii. p. 34, 1. 1. f. 6 ; Bellardi, 

 Saggio &c. ii. p. 75 (Saropogon). — Mexico. 



(Saropogon) tricolor, Bellardi, 1. c. p. 72. — Mexico. 



( ) virescens, Bellardi, 1. c. p. 69. — Mexico. 



LASTAURUS. 



Lastaurus, Loew, Bemerk. iiber die Fam. Asiliden, p. 11 (Berlin, 1851). 



l. Lastaurus anthracinus. (Tab. III. fig. 10, s .) 



Lastaurus anthracinus, Loew, Bemerk. iiber die Fam. Asiliden, p. 12 \ 

 Hob. Mexico 1 ; Guatemala, Purula (Champion). 



I have two male and two female specimens from Guatemala which very probably 

 belong to one species, although they differ in the colouring of the abdomen. 



Male. The whole body, including the legs and antennae, uniformly velvety-black, 

 opaque ; the last two segments of the abdomen beset with pale yellow, sometimes slightly 

 reddish, hairs ; the genitals with black hairs ; wings tinged with brown, and with metal- 

 lescent blue reflections. 



2a2 



