NEW MUSCOID FUES FROM THE ANDEAN MONTANYA 141 



hind suture. Scutellum reddish-brown, faintly pollinose on base. Abdo- 

 men brownish-red, first segment blackish in middle ; segments 2 to 4 with 

 silvery front border and median vitta, both border and vitta successively 

 widening on segments 3 and 4, but vitta much narrowed on tip of fourth 

 and rarely Madest on third segment. Bordering the vitta on second seg- 

 ment the disk is blackish shining, such blackish being extremely fmnt on 

 third segment and practicaJly absent on fourth. On venter the silvery of 

 second and third segments spreads over whole of inner half or more of 

 sclerite on each side, that of anal segment not widening. Legs wholly 

 concolorous with the first two antennal joints, from coxae to tarsi, being 

 a reddish-fulvous or yellowish-rufous. Wings wholly deeply fuscous. 

 Hind scale of tegulae watery-white ; front scale fuscous on borders, some- 

 times dilute on disk, sometimes wholly fuscous. 



The marginal row of macrochaetae of second segment shows a gap 

 on each side of heavy median pair about as wide as distance separating 

 the two bristles of that pair ; the transverse discal row of third segment 

 is complete and thickly placed, somewhat irregular. 



Type, female of September 8. 



Saundersiops cruciata subspecies, cayensis new subspecies. 



Length of body, 10 to 12 mm. ; of wing, 9 to I 1 mm. Nineteen 

 males and three females, Huancayo, about 1 0,500 feet, March 25, 1913, 

 on flowers of Baccharis sp. and C^clanthera sp. 



Differs from the Matucana form as follows : Pollen of face and cheeks 

 silvery-white, without trace of golden, epistoma tav^iy. Mesoscutum 

 more conspicuously olive from the more brassy pollen. Pollen of abdo- 

 men has a pronounced brassy-tawny tinge ; pollinose front borders of third 

 and fourth segments about equally wide, that of second very narrow. 

 Wings not so deeply fuscous ; tegulae more contrasted, the front scale 

 usually smoky-black, hind scale white. 



Type, TD4128 (fly, straplike uterus). 



This form presents a very distinct habitus from the Matucana form, yet 

 I consider it only a subspecies thereof. It occurs 2,000 to 3,000 feet 

 ' higher up and about 1 50 miles to the southeeist. The two localities are 

 separated by snowy crests and deep canyons. 



Saundersiops simillima, new species. 



Length of body, 10 to 11 mm. ; of wing, 10 to 11 mm. Three 

 females from Tamboraque, about 9,000 feet, April 3, 1 9 1 0, on flowers 



