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, 00 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, S 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 le.ss 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 l)lack, 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 largely hyaline in the middle 
but plainly infuscated along the veins at each side; a])ical spot 
wide, filling out all the marginal cell, two-thirds of first sul)- 
marginal and half of second submarginal. The abdomen has a 
.small black spot on the fir.st segment 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. 
T 3 "pe taken at Longmeadow, Massachusetts, b\" Dr. Geo. 
Dimmock. Eight other s])ecimens taken at Columbus, and 
Wauseon, Ohio, and Anglesia and Westfield, New Jerse\", those 
from the latter state by V. A. E. Daecke and H. S. ITarbeck, of 
Philadelphia. 
This species has been in m}' 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 man^' 
s])ccimens have been collected and sent in that it seems that it 
must be distinct. 
