72 
Psyche 
[September 
A NEW SPECIES OF THE GENUS MYDAS 
By Charles W. Johnson 
Boston Society of Natural History 
The following species of Mydas from Yucatan and Guate- 
mala were received from Dr. Jos. Bequaert for determina- 
tion. 
Mydas perpolitus sp. nov. 
Head black, somewhat shining, pile on the front and ver- 
tex black, on the face and sides near the base of the an- 
tennae white, pollen and pile on the occiput white. Antenna 
black, the enlarged apical portion dark brown. Thorax dull 
black, in certain light there are indications of three obscure 
stripes, scutellum black. First abdominal segment dark 
bluish black, shining, and with fine short black hairs, the 
other segments are dark blue, highly polished, and with 
very minute black hairs, the venter has the same color and 
polish, hypopygium dark brown, with quite long black hairs. 
Legs black with black hairs, ungulse brown with black tips, 
pulvilli yellow, posterior femora thickened, this portion 
bearing two rows of thickened spines below. Wings brown- 
ish black, with lighter streaks in the middle portion of many 
of the cells, halteres black. Length 22 mm. The paratype 
measures 19 mm. 
Two males from Chichen Itza, Yucatan, Mexico, June 29, 
1929. Collected by Dr. Jos. Bequaert. Holotype and para- 
type in the Museum of Comparative Zoology, Cambridge, 
Mass. In my key 1 it would run to section 4 and follow 
M. carbonifer 0. S. from which it is readily separated by its 
dark blue and highly polished abdomen. 
Mydas bitaeniatus Bellardi 
One male of this species was collected by Dr. Jos. 
Bequaert at Zacapa, Guatemala, May 9, 1931. It is in the 
Museum of Comparative Zoology. 
Troc. Boston Soc. Nat. Hist., voli 28, p. 133, 1926. 
