PSYCHE 
Vol. 58 March, 1951 No. 1 
ON SOME CENTRAL AND SOUTH AMERICAN 
PTEROSTICHINI (COLEOPTERA, CARABIDAE) 
IN THE MUSEUM OF COMPARATIVE ZOOLOGY* 
By S. L. Straneo 
Gallarate, Italy 
Some weeks ago I received for study from Dr. P. J. 
Darlington Jr. many undetermined Central and South Amer- 
ican Pterostichini from the collection of the Museum of 
Comparative Zoology of Cambridge, Massachusetts. This 
material was so interesting that I decided to write the 
present notes on it and on a few examples of two of the 
same species in my collection. I have to thank Dr. Darling- 
ton for submitting these specimens to me and for per- 
mission to keep many duplicates for my collection. 
Tichonia orientalis, n. sp. 
Purplish violaceous, metallic color stronger in the holo- 
type $ than in the allotype $ ; lower surface blackish, legs 
dark rufopiceous, antennae and palpi wholly ferrugineous. 
Length 11.6 mm.; width 4.4 mm. Head robust; eyes promin- 
ent and convex ; frontal impressions wide and deep, narrow 
and strongly divergent behind, reaching the 2nd supraorbital 
seta; antennae long and slender, exceeding by the last three 
segments the base of the pronotum. Prothorax transverse in 
the S (2.5 by 3.3 mm.) and nearly square in the $ ; sides 
rather strongly rounded and narrowed to apex (2 mm.), 
straight or a little subsinuate towards base (2.8 mm.) ; 
anterior angles obtuse, rounded ; basal angles nearly square, 
with apices slightly rounded ; basal impressions, one on each 
* Published with a grant from the Museum of Comparative Zoology 
at Harvard College. 
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