Nov., 1905.] New Species North American Chrysops. 393 



on the dorsal side except segments two, three and four each have 

 a transverse gray marking on the posterior border. 



Type taken at Los Amates, Guatemala, 60 miles inland from 

 Puerto Barrios, at an elevation of perhaps 250 feet, Februarv 

 21, 1905. 



Other specimens were procured at Morales and at Puerto 

 Barrios. 



Chrysops dimmocki, n. sp. Female, body colored like callidus, 

 wing like montanus. Length, 8 millimeters. 



Frontal tubercle black, front covered with a greenish gray 

 pollen which follows the margins of the eyes to the occiput 

 widening somewhat, below the frontal callosities. Face' light 

 yellow, palpi darker, proboscis brown. First and second seg- 

 ments of the antenna and base of the third yellowish and clothed 

 with rather course black hairs, remainder of third segment black. 

 Thorax above with four rather wide greenish gray stripes which 

 are slightly less distinct posteriorly. Legs mostly yellow, but 

 apical parts of middle and hind tarsi blackish ; front legs with 

 apex of tibia and whole of tarsus black or dark brown. Wings 

 with costal margin and crossband black, first and second basal 

 cells with very slight infuscation at base; the crossband reaches 

 the posterior margin, filling out the fourth posterior cell, outer 

 border curved, fifth posterior cell largelv hyaline in the middle 

 but plainlv infuscated along the veins at each side ; apical spot 

 wide, filling out all the marginal cell, two-thirds of first sub- 

 marginal and half of second submarginal. The abdomen has a 

 small black spot on the first segm.ent beneath the scutellum, 

 second segment with a black inverted V whose apex reaches the 

 anterior margin, otherwise yellow, remaining segments with the 

 exceptions of the lateral and hind margins black, the hind 

 margin expands into a triangle in the middle on each segment; 

 venter yellow with dark markings toward the apex. 



Type taken at Longmeadow, Massachusetts, by Dr. Geo. 

 Dimmock. Eight other specimens taken at Columbus, and 

 Wauseon, Ohio, and Anglesia and Westfield, New Jersey, those 

 from the latter state by V. A. E. Daecke and PL S. Harbeck, of 

 Philadelphia. 



This species has been in my collection for a long time and I 

 hesitated to name it for the reason that no male specimen could 

 be procured, but the characters are so constant and so manv 

 s])ecimens have been collected and sent in that it seems that it 

 nnist l)e distinct. 



