34 
Psyche 
[March 
species of this genus are involved. To our knowledge, no Gnostus 
has been collected with ants of any other group, and the record of 
G. meinerti from a termite nest needs verification. According to 
Professor E. O. Wilson (personal communcation) , only one speci- 
men of G. floridanus was found in a colony of C. cishmeadi Mayr on 
Plantation Key, although the ant is very common at that locality. 
Bates, on the other hand, as quoted in Westwood (1855), states that 
the formicaria of Crematogaster victima Smith almost invariably 
contained one, or at most two, Gnostus formicicola. 
Key to the species of gnostus 
1. Tibiae only very slightly compressed, about 4 times as long as 
wide at apex (Fig. 2) ; longitudinal grooves of pronotum 
deep; Florida and Bahamas floridanus Blatchley 
— Tibiae strongly compressed and expanded apically, only 2 times 
as long as wide at apex (Figs. 3 — 4) ; longitudinal grooves 
of pronotum very shallow; South America and Panama .... 2 
2. Posterior tarsus, when retracted, almost completely hidden in 
apical groove of tibia (only tarsal claws visible) ; longitudinal 
grooves of pronotum converging apically; Venezuela and 
Panama meinerti Wasmann 
— Posterior tarsus, when retracted, not completely hidden in apical 
groove of femur (5th tarsomere and claws visible); longitu- 
dinal grooves of pronotum subparallel; Brazil and Bolivia 
formicicola Westwood 
Gnostus formicicola Westwood 
(Fig. 4) 
Gnostus formicicola Westwood, 1855, Trans. Ent. Soc. London, (2)3: 92, 
pi. 8, figs. 1-21. 
type data: “Habitat in Brasilia, apud Santarem, in nidis 
Myrmicae ( Crematogastris) victima , Smith. D. Bates. In Mus. 
Britann., &c.” Lectotype, by present designation, $, with the fol- 
lowing labels: 1) “Co-type, Westwood Trans. Ent. Soc. 1855. p. 90. 
T. 8. Coll. Hope Oxon.” (red border), 2) “W Amazon Bates” 
(diamond-shaped), 3) “Gnostus formicicola Westwood B2 Bates,” 
4) “Type Col: 235 Gnostus formicicola Westw. Hope Dept. Ox- 
ford” (Black border) ; deposited in the Hope Department of En- 
tomology, Oxford, England. 
Specimens Examined: Bolivia: La Paz, Mapiri, iv — ix. 1925, 
G. L. Harrington col. (i$, USNM). brazil: Mato Grosso , Utiar- 
iti, 325 m, viii.5.1961, K. Lenko col., with Crematogaster prope 
