Kov., 1905.] Xew Species North American Chrysops. 
391 
NEW SPECIES OF NORTH AMERICAN CHRYSOPS. 
Jas. S. Hixe. 
Of the four species described in this paper three were taken in 
Guatemala. The other one is from eastern United States and is 
described at this time for the reason that a student of the group 
desires to mention the species in a paper he is preparing for 
publication. The Guatemalan material was procured in com- 
pany with Mr. E. B. AVilliamson of Bluffton, Indiana. 
Chrysops melanopterus, n. sjj. Female, black, first two seg- 
ments of the antenna each longer than the third. Length, 9 
millimeters. 
Relative length of the antennal segments 2; 1.5:1. Basal seg- 
ment without indication of enlargement as is the case with other 
species of the genus having the first and second antennal , seg- 
ments elongated. Whole body, including wings, legs and 
antennae, black. 
Tvpe taken at a point about five miles up the railroad from 
Puerto Barrios, Guatemala, Department of Izabal, March 14, 
1905. The locality was along the railroad where it passed 
through an extensive swamp only a few feet above sea level. 
Two other specimens were procured at the same place, one 
from the back platform of a freight caboose. The specimen 
followed the moving train for some time before it was captured. 
The species is entirely distinct from any species I have seen 
or have found described. The uniform black wings are peculiar 
for a memljer of this genus. 
Chrysops pachycnemius, n. sp. Female wing with costal 
margin and crossband black, apical spot separated from the 
crossband; abdomen yellow at the base, black apically. Length, 
S millimeters. 
Lower ])art of the front, including the frontal callosity, and 
the face yellow; |)alpi a shade darker than the face, proboscis 
black. Region of the ocelli shining black, otherwise the upper 
])art of the front covered with bright yellow pollen. First seg- 
ment of the antenna yellow, second yellow on the inner side, 
brown outside, third black. Thorax shining black with four 
dorsal stripes formed by yellow pollen, the two inner abbreviated 
behind, the two outer broken at the transver.se suture; side of 
the thorax with a yellow s])Ot behind the eye, one directly 
beneath the root of the wing and another just behind it. Wing 
with the base, costal cell and the crossband black, apical spot 
separated from the crossband by a wide space, extreme base of 
each costal cell black, the inner margin of the crossband extends 
from the branching of the second and third veins nearly straight 
to the anal vein passing near the inner end of the discal and fifth 
