72 DIPTERA. 



towards the tip ; connecting cross-vein near the posterior margin present. A single 

 male. 



4. Midas chrysites, sp. n., <$ . 



Altogether black, the wings brown ; abdominal segments 2-5 covered with short, appressed, golden-rufescent 



pile, not dense enough to modify much the black ground-colour. 

 Length 32 millim. 



Hab. Mexico, Northern Sonora (Morrison). 



A little smaller than M. clavatus, the thorax and abdomen much narrower, the latter 

 gradually tapering from the base to the tip. 



Head, antennae, occiput, &c. altogether black, clothed with black pile, forming a 

 dense, dependent tuft on the facial gibbosity. Thorax and pleura? black, moderately 

 shining, without any trace of a hoary pollen (the thoracic dorsum being somewhat 

 greasy, I am unable to describe it more accurately). Abdomen black, moderately 

 shining, towards its end and in the middle of the ventral segments some bluish reflec- 

 tions are visible ; the dorsal segments 2-5 (except the hind margins) clothed with a 

 short, appressed, golden-rufescent pubescence, especially perceptible in an oblique light, 

 but not dense enough to conceal the black and shining ground-colour much when 

 viewed in a vertical direction ; the corresponding pubescence on segments 6 and 7 is 

 black. Halteres black. Legs black ; hind femora a little less incrassate than in 

 M. clavatus, 6 , beset with spines on the underside ; hind tibiae with the hook at the tip. 

 Wings infuscated ; the anterior margin, between the second vein and the costa, and 

 also the third vein, before the fork, are slightly tinged with ferruginous, and therefore 

 less dark than in M. clavatus ; venation like that of M. clavatus ; the stump on the 

 fork and the connecting cross-vein on the hind margin are present. A single male. 



N.B. — When I examine the specimen from behind, in the direction of the axis of the 

 body, I perceive that the edge of the third abdominal segment is red ; this is not the 

 case with the other segments ; but I do not know whether this is a permanent character 

 or not. 



5. Midas cleptes, sp. n., s . 



Black, thorax opaque, segments 2-4 rufous on the dorsal side ; wings infuscated. 

 Length 25 millim. 



Hab. Mexico, Northern Sonora (Morrison). 



Head and antennae altogether black, clothed with black hairs; a slight brownish- 

 grey pollen along the facial orbit and in the depression on each side of the upper part 

 of the face ; a narrow margin of greyish pollen along the occipital orbit. Thorax deep 

 black and opaque. Halteres black. Abdomen very gently tapering, black, with distinct 

 bluish reflections on the venter, less distinct on the last two dorsal segments ; dorsal 

 segments 2-4 red, the second more or less darkened at the base ; a scarce microscopic 



