JAMES A. G. REHN 
123 
allied to oxydactijla (Perty) and camerani Giglio-Tos a closer 
relative of didacUjlus (Latreille). 
Scapteriscus camerani Giglio-Tos 
1894. Scapteriscus camerani Giglio-Tos, Boll. Mus. Zool. Anat. Comp. Torino, 
ix, no. 184, j). 4.5. [Province of Han Pedro and Asuncion, Paraguay.] 
Rio Madeira, five hundred miles from mouth. (Mann and 
Baker.) One male. 
Amazon, one hundred knots west of Santarem. (Mann and 
Baker.) Two males, two females. 
These specimens have been carefully compared with a male 
of this species from Buenos Aires, Argentina, previously reported 
by us,“^ and we find they represent the same species. It is a close 
relative of didactylus, but can be distinguished with ease by its 
broader and shorter head, which has the eyes slightly less promi- 
nent, and by the broader pronotum, the caudal margin of which is 
more broadly rounded and less produced arcuate. The charac- 
ter of the trochanterial process also assists in the determination, 
but the head form is the most striking feature. 
The species has been recorded from Gualaquiza and ^"alle del 
Santiago, eastern Ecuador, and it is quite evident from the records 
now known that its distribution is quite extensive, covering at 
least a considerable portion of the upper and middle Amazonian 
regions, in addition to reaching as far to the south as Buenos 
Aires. 
Scapteriscus vicinus Scudder 
1869. Scapteriscus vicinus Scudder, Mem. Peabody Acad. Sci., i, pp. 7 and 12, 
pi. i, figs. 4 and 23. [Rio Negro; Piauhy and Pard., Brazil; Panama; Rio 
Grande (Brazil?); Asia?) 
Quibdo, Cauca, Colombia. September, 1896. One female. 
Caicara, Venezuela. July 9, 1907. (G. K. Cherrie.) Six 
males, seven females. [A. N. S. P. and Hebard Cln.] 
Rio Pacaya, Peru. July, 1912. One female. 
We have been able to compare these specimens with the single 
male from Rio Negro (received from P. R. Uhler) which stands 
at the head of the list of specimens in the original description, and 
which is here selected as the lectotype. This individual demon- 
strates that Rehn and Hebard have correctly interpreted the 
species in their study of material from North America. 
21 Proc. .Acad. Nat. Sci. Phila., 1915, p. 289, (1915). 
TRANS. AM. ENT. SOC., XLIIl. 
