SYNOPSIS OF NORTH AMERICAN SYRPHID^. 213 



with grayish dust. Thorax greenish- bhick, shiuiug', with rather long 

 dusky pile, more abundant and whitish on the ])leur8e. Abdomen deep 

 shining greenish-bhick, with short erect bhick pile, on the sides and on 

 the hist segment longer, yellowish white ; second segment on the sides 

 with a large yellow triangle, reaching the whole length of the segment 

 and continuous on the side of the third, narrowly in the male, more 

 broadly in the female, clothed with abundant yellow pile. Legs chiefly 

 yellow, with light yellowish pile ; front femora, except the tip, middle, 

 except base and end, and the hind pair, except a broad preapical ring, 

 and last three joints of all the tarsi, black ; front tibiae with a moderate, 

 middle with a narrow ring beyond the middle, hind tibiaj, exce])t base 

 and tip, and hind metatarsi, except the tip, brownish or brownish -black. 



Two specimens (Nos. 1510, 1511), from near Glen House, White 

 Mountains, New Hampshire (Dr. George Dimmock). A single male 

 specimen from Minnesota (from ]\Ii'. E. Keen) differs in the third joint 

 of the autennffi being more yellowish and the front femora at the very 

 base, yellow. 



I do not doubt that this is Walker's Uristalis intersistenfi ; nothing is 

 said of the black facial stripe in X. badia. "The synonymy is doubtful, 

 as the description of the face does not quite agree ; it is principally 

 based on my recollection of the types at the British Museum." — O. 

 Sacken, 1. c. 



Three specimens (5,9), from Fairmount Park, Pennsylvania, May 

 23, from Mr. E. Keen. 



Criorhina (Cynorhina) armillata. 



Criorhina armillata Osteu Sacken, Bull. Bufif. Soc. N. Sci., iii, 68; Cat. Dipt., 

 2:A, 1878. 



Habitat.— Quebec (O. S.)! 



" $ . Length, 11 to 12^"™. Face and front above the antennae honey -yel- 

 low; upper part of front and vertex blackish-bronze color, with fulvous 

 pile; a black si)Ot on the cheeks; antennae yellow ferruginous, arista 

 black; thoracic dorsum and scutellum greenish-bronze color, clothed 

 with ei ect fulvous pile ; pleurae and i)ectus black. Abdomen black, shin- 

 ing, clothed with black pile ; a [small] tuft of yellow pile on each side at 

 the base. Halteres yellow. Coxae and about two thirds of the femora 

 black ; the end of the latter, the tibiae, except a black ring in the mid- 

 dle of each, and the three basal joints of the tarsi are of a saturate yel- 

 low ; the last two tarsal joints black. The proximal tw^o-thirds of the 

 wings are tinged with yellowish, the remainder is gray ; the latter color 

 extends along the posterior margin as far as the axillary incision ; 

 within the yellow portion there is a hyaline spot in the angle between 

 the tirst and second veins (at the proximal end of the marginal cell) ; 

 the veins near the root of the wings are all tinged with yellow. 



'•A single female specimen." — O. Sacken. 



Description compared with the type specimen at Cambridge. 



